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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260603T110000
DTEND;TZID=Europe/Paris:20260603T120000
DTSTAMP:20260618T044742
CREATED:20260529T091746Z
LAST-MODIFIED:20260529T091746Z
UID:10000167-1780484400-1780488000@sfp-alpes.fr
SUMMARY:Arjun DEY (Paul Scherrer Institute)
DESCRIPTION:Excitation energies from ground-state DMRG on the fuzzy sphere\nRésumé : \nIt has been observed that some eigenvalues of the effective local Hamiltonian built during a ground-state DMRG sweep of a one-dimensional critical chain stay nearly flat across iterations. Those flat levels correspond to true low-energy excitations\, giving access to the excitation spectrum at no extra cost. We ask whether the same holds on the fuzzy sphere\, a geometry used to study two-dimensional critical theories by mapping them onto a one-dimensional orbital chain. Getting excited states there directly is costly. We find numerical evidence that flat levels appear in the eigenvalues of the effective local Hamiltonian during our sweeps and match the expected low-energy spectrum. The symmetries of the fuzzy sphere and orthogonalization across symmetry sectors introduce additional structure into those eigenvalues\, which helps in resolving and assigning the excitations. \n_ \nContact : loic.herviou@lpmmc.cnrs.fr
URL:https://sfp-alpes.fr/event/arjun-dey-paul-scherrer-institute/
LOCATION:LPMMC – salle Roger Maynard (G421)\, CNRS - LPMMC 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260604T140000
DTEND;TZID=Europe/Paris:20260604T150000
DTSTAMP:20260618T044742
CREATED:20260528T152555Z
LAST-MODIFIED:20260528T152555Z
UID:10000162-1780581600-1780585200@sfp-alpes.fr
SUMMARY:Nan TANG (University of Augsburg)
DESCRIPTION:New Macroscopic Windows into Spin Ice : From Emergent Monopoles to Quadrupolar Fluctuations\nRésumé : \nSpin ice\, a representative class of frustrated magnets\, provides a rich platform for exploring phenomena such as fractionalized excitations and multipolar degrees of freedom\, which remain difficult to access using conventional magnetic probes. In this seminar\, I will show how thermodynamic measurements\, especially elastic probes\, together with spintronics technique (in particular the spin Seebeck effect)\, can serve as practical detectors of these degrees of freedom. \nI will develop this theme via two studies in the pyrochlore oxides Pr2​Zr2​O7​ and Dy2​Ti2​O7​\, known as spin ices. First\, I will show how bulk thermodynamic measurements\, centered around elastic probes\, can diagnose quantum spin ice physics in Pr2​Zr2​O7​ [1]. Second\, I will discuss how transport-sensitive measurements in an insulator—through the spin Seebeck effect—can access the dynamics of emergent magnetic monopoles in the classical spin ice Dy2​Ti2​O7​ [2]. Together\, these two studies demonstrate how lattice-based probes and spintronic tools can be brought to bear on frustrated magnets\, providing new routes to detect low-energy degrees of freedom. \nIn this way\, precision thermodynamics and modern transport-sensitive techniques can reveal new physics even in long-studied frustrated magnets\, enabling direct comparison with theory through sharp macroscopic signatures. \n[1] N. Tang et al.\, Nat. Phys. 19\, 92-98 (2023).\n[2] N. Tang et al.\, preprint\, arXiv.2509.18422 (2025).\n  \n_ \nContact : elsa.lhotel@neel.cnrs.fr
URL:https://sfp-alpes.fr/event/nan-tang-university-of-augsburg/
LOCATION:CNRS – Salle Rémy Lemaire (K223)\, CNRS - Institut Néel 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260604T160000
DTEND;TZID=Europe/Paris:20260604T170000
DTSTAMP:20260618T044742
CREATED:20260213T142628Z
LAST-MODIFIED:20260213T143322Z
UID:10000071-1780588800-1780592400@sfp-alpes.fr
SUMMARY:Sophie GUERON
DESCRIPTION:Explorer les isolants topologiques avec la physique mésoscopique\n_ \nToutes les informations sont disponibles sur : https://indico.ijclab.in2p3.fr/event/12406/ \nContact : louis.fayard@IJCLAB.INP3.FR
URL:https://sfp-alpes.fr/event/sophie-gueron/
LOCATION:Laboratoire IJCLab – Auditorium Pierre Lehmann\, Rue Ampère\, Orsay cedex\, 91898\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260609T140000
DTEND;TZID=Europe/Paris:20260609T150000
DTSTAMP:20260618T044742
CREATED:20260604T105036Z
LAST-MODIFIED:20260605T084741Z
UID:10000181-1781013600-1781017200@sfp-alpes.fr
SUMMARY:Jean-Claude BESSE (Department of Physics\, ETH Zurich\, CH-8093 Zurich\, Switzerland)
DESCRIPTION:Execution of Blind Quantum Computing Primitives on a Modular Superconducting Processor\nRésumé : \nAs a route towards a cluster of interconnected processors in a quantum network\, the Quantum Device Lab’s approach to short-range modularity uses small modules with high fabrication yield flip-chip bonded to a common carrier chip. In the first part of this talk\, we focus on the hardware realization of this 3D-integrated architecture with indium bump bonds\, inter-chip spacing control\, and parameter targeting enabling high-fidelity operations 1\,2. We then leverage this technology in a two-module processor\, with three qubits per node 3. The first module acts as a server generating cluster states as entangled quantum resource. The second module acts as a client\, consuming the resource through real-time adaptive measurement basis choice. We demonstrate that the client can implement universal single- and two-qubit gates with local measurements and rotations only. As an example of blind quantum computation\, we show results of a measurement-based Deutsch-Jozsa algorithm. We verify that the computation remains private\, that is\, the server’s state doesn’t reveal the client’s algorithm nor its result. This demonstrates that cloud quantum providers can be set up in a way that they respect the data privacy of their clients 4. \n1 Norris et al.\, EPJ Quant. Tech. 11\, 5 (2024) 2 Norris et al.\, EPJ Quant. Tech. 13\, 29 (2026) 3 Dalton et al.\, PRX Quantum 6\, 040365 (2025) 4 Song et al.\, arXiv:2605.14656 (2026) \n_ \nContact : sem_nano_elec_quantique@listes.grenoble.cnrs.fr
URL:https://sfp-alpes.fr/event/jean-claude-besse-department-of-physics-eth-zurich-ch-8093-zurich-switzerland/
LOCATION:CNRS – Salle Rémy Lemaire (K223)\, CNRS - Institut Néel 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260609T140000
DTEND;TZID=Europe/Paris:20260609T150000
DTSTAMP:20260618T044742
CREATED:20260529T080157Z
LAST-MODIFIED:20260529T080157Z
UID:10000165-1781013600-1781017200@sfp-alpes.fr
SUMMARY:Soline BEITONE (PhD Student - LMGP)
DESCRIPTION:Development and evaluation of a photocatalytic system to reduce and valorize CO2\nRésumé : \nThis work focuses on the development of a photocatalytic system for CO₂ reduction and valorization\, contributing to sustainable carbon conversion strategies. The study investigates Cu₂O nanowire (NW)-based photocatalyst\, selected for their visible-light activity\, abundance\, and low toxicity. \nA simple\, scalable\, and cost-effective fabrication strategy was developed to produce such photocatalyst. To enhance performance and stability\, the materials were further engineered through TiO₂ nanoparticle modification\, enabling the formation of p–n heterojunctions that improve charge separation\, stability and light utilization. \nThe resulting photocatalysts were evaluated for CO₂ conversion into value-added products and water depollution through dye degradation. \nFinally\, a life cycle perspective was incorporated to assess environmental impacts\, sustainability benefits\, and the scalability potential of these photocatalytic systems. \nShort Bio/CV \nI am a third-year PhD student with a background in materials science and chemistry. My research focuses on photocatalysis and materials development\, with an emphasis on green and sustainable approaches. \nI am part of the NABIOS team\, and my PhD project is integrated into DéfiCO₂\, a multidisciplinary initiative aimed at developing and evaluating technological solutions for carbon capture and utilization (CCU). \n_ \nContact : deborah.verger@grenoble-inp.fr
URL:https://sfp-alpes.fr/event/soline-beitone-phd-student-lmgp/
LOCATION:LMGP – salle des séminaires\, Grenoble INP -Phelma 3 parvis Louis Néel\, Grenoble\, 38054\, France
CATEGORIES:Séminaire
ORGANIZER;CN="LMGP":MAILTO:deborah.verger@grenoble-inp.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260610T110000
DTEND;TZID=Europe/Paris:20260610T120000
DTSTAMP:20260618T044742
CREATED:20260604T110614Z
LAST-MODIFIED:20260604T110614Z
UID:10000182-1781089200-1781092800@sfp-alpes.fr
SUMMARY:Mahdi ABOU-HAMDAN (LPMMC)
DESCRIPTION:TITRE A VENIR\n_ \nContact : pierre.nataf@lpmmc.cnrs.fr
URL:https://sfp-alpes.fr/event/mahdi-abou-hamdan-lpmmc/
LOCATION:LPMMC – salle Roger Maynard (G421)\, CNRS - LPMMC 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260612T110000
DTEND;TZID=Europe/Paris:20260612T120000
DTSTAMP:20260618T044742
CREATED:20260604T132045Z
LAST-MODIFIED:20260604T132045Z
UID:10000183-1781262000-1781265600@sfp-alpes.fr
SUMMARY:Benjamin LENZ (IMPMC)
DESCRIPTION:Spectroscopic signatures of spin-polarons in quasi two-dimensional correlated materials\nRésumé : \nThe motion of a single hole in a two-dimensional antiferromagnet can lead to the formation of a low-energy quasiparticle\, a so-called spin-polaron\, which amounts to a bound state of the doped hole and a spin flip. In this talk\, I will first introduce the notion of spin-polarons and then discuss spectroscopic signatures of this quasiparticle at the example of two different material classes which both host quasi two-dimensional low-energy physics in their correlated electronic structure.\nIllustrated by the Na-doped oxychloride Ca2CuO2Cl2\, we will see how the spin-polaron gives rise to “kink” and “waterfall” features in the spectral function of hole-doped cuprates. Employing a numerical workflow comprising density functional theory and cluster dynamical mean-field theory\, we will discuss these features in comparison to measurements obtained from angle-resolved photoemission spectroscopy. As a second example\, we will see that spin-polaron physics is also relevant in two prototypical iridates\, (Ba\,Sr)2IrO4\, which host an exotic spin-orbital entangled jeff=1/2 ground state. In particular\, the characteristic two-peak structure of their optical absorption and optical conductivity curves will be revisited and interpreted in the light of these coherent low-energy quasiparticles. \nB. Bacq-Labreuil et al.\, Phys. Rev. Lett. 134\, 016502 (2025)\nF. Cassol et al.\, arXiv:2509.20337; accepted in Phys. Rev. B (2026) \n_ \nContact : serge.florens@neel.cnrs.fr
URL:https://sfp-alpes.fr/event/benjamin-lenz-impmc/
LOCATION:LPMMC – salle Roger Maynard (G421)\, CNRS - LPMMC 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260612T140000
DTEND;TZID=Europe/Paris:20260612T160000
DTSTAMP:20260618T044742
CREATED:20260604T141732Z
LAST-MODIFIED:20260604T141732Z
UID:10000186-1781272800-1781280000@sfp-alpes.fr
SUMMARY:Soutenance de Thèse de Giovanni OLIVETTI (CEA-Irig / Spintec)
DESCRIPTION:Angular Momentum Transfer Between Waveforms in Axisymmetric Geometries\nRésumé : \nThis thesis investigates the role of angular momentum transfer in the coupling between elastic and spin excitations in magneto-mechanical systems. \nIn axisymmetric geometries\, rotational invariance provides the natural framework for the conservation of total angular momentum[1]. In such a case\, this quantity unambiguously labels the eigenmodes of the system and constrains their coupling to an external excitation through well-defined selection rules[2]. The manuscript develops this physical picture from a general perspective based on Noether’s theorem\, it introduces spin and orbital angular momentum contributions for a generic vector field and proposes an analytical description of magneto-elastic coupling in axisymmetric systems. \nThis framework is then applied to two complementary experimental platforms realized in the context of this doctoral work. The first combines chiral surface-acoustic excitations with a magnetic vortex texture in a patterned ferromagnetic disk. The second consists of partially suspended axisymmetric YIG microresonators\, designed to support both low-loss mechanical motion and confined spin dynamics within the same structure[3]. Together\, these two systems provide complementary routes to investigate how elastic and magnetic modes carrying angular momentum can be generated\, controlled\, and coupled in realistic devices. \nIn particular\, this work demonstrates the controlled excitation and optical mapping of a surface-acoustic vortex by means of spiral interdigitated transducers. It further addresses the stabilization of magnetic vortex textures in micrometer-scale ferromagnetic disks on anisotropic piezoelectric substrates\, as well as their positioning at the center of elastic rotation. The coupling strength in suspended axisymmetric YIG microresonators has been evaluated by comparing experimental data with theoretical modeling\, indicating a weak-coupling regime. Moreover\, the role of weak symmetry breaking has been discussed for the selective excitation of counter-propagating elastic modes that would otherwise be degenerate. \nThese developments establish several of the physical and technological conditions required to address experimentally the coupling of elastic and spin excitations carrying angular momentum. More broadly\, they outline a route toward magneto-elastic platforms in which symmetry can be used as a resource for selective excitation. In this perspective\, partially suspended magnetic microresonators may provide a promising route toward strong magnon-phonon coupling under geometrical and symmetry constraints directly relevant for coherent functionalities. In the longer term\, such systems could serve as building blocks for mode-selective transducers and hybrid architectures combining magnetic\, elastic\, and optical degrees of freedom\, with possible perspectives for microwave-to-optical coherent transduction[4]. \nReferences \n\nGaranin & Chudnovsky\, Phys. Rev. B 92\, 024421 (2015).\nAn et al.\, Phys. Rev. B 101\, 060407 (2020).\nHeyroth et al.\, Phys. Rev. Appl. 12\, 054031 (2019).\nEngelhardt et al.\, Phys. Rev. Appl. 18\, 044059 (2022). ​\n\n\n\nPlus d’information\n​ \nPour suivre la soutenance ​​​en visioconférence​ ​​: lien à venir\n\n\n\n\nAccess to the CNRS site is restricted. Please contact Olivetti Giovanni​  or Benjamin Pigeau at least 48h before the defense if you need an entry clearance. You just need to communicate your name and surname\, and you will receive the entry clearance by email.
URL:https://sfp-alpes.fr/event/soutenance-de-these-de-giovanni-olivetti-cea-irig-spintec/
LOCATION:CNRS – Bâtiment A\, CNRS - Institut Néel 25 avenue des Martyrs\, Grenoble\, 38054\, France
CATEGORIES:Soutenance,Soutenance de Thèse
ORGANIZER;CN="IRIG - CEA":MAILTO:odile.rossignol@cea.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260615T110000
DTEND;TZID=Europe/Paris:20260615T120000
DTSTAMP:20260618T044742
CREATED:20260611T102519Z
LAST-MODIFIED:20260611T102519Z
UID:10000193-1781521200-1781524800@sfp-alpes.fr
SUMMARY:Luis Alberto RAZO LOPEZ (Institut Langevin\, Paris)
DESCRIPTION:Phase retrieval based on intensity-only spatiotemporal wavefront shaping\nRésumé : \nWe introduce a phase retrieval framework based solely on intensity measurements and intensity-only spatiotemporal modulation. Our approach leverages spatiotemporal wavefront shaping to encode phase information into temporally multiplexed intensity signals\, which are subsequently decomposed in the Fourier domain. We show that the resulting temporal harmonics correspond to spiral-phase–modulated speckle components\, enabling the retrieval of phase information without direct phase-sensitive detection. We derive the harmonic structure induced by a rotating angular aperture mask and demonstrate that each harmonic carries a distinct spiral phase and amplitude weighting governed by a sinc envelope. Based on this structure\, we develop an optimization-based reconstruction algorithm that retrieves both the unknown diffuser phase and system scaling without prior knowledge of the optical transfer function. Experimental results confirm accurate reconstruction of diffuser surfaces and aberration correction\, including refocusing through digital micromirror device (DMD)-induced distortions. \nContact : dorian.bouchet@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/luis-alberto-razo-lopez-institut-langevin-paris/
LOCATION:LiPhy – Salle de conférence\, LiPhy 140 avenue de la Physique\, St Martin d'Hères\, 38402\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260616T140000
DTEND;TZID=Europe/Paris:20260616T150000
DTSTAMP:20260618T044742
CREATED:20260611T103209Z
LAST-MODIFIED:20260611T103209Z
UID:10000194-1781618400-1781622000@sfp-alpes.fr
SUMMARY:Roger TORMO-QUERALT (Institute of Photonic Sciences (ICFO)\, Barcelona\, Spain)
DESCRIPTION:Carbon Nanotube Electromechanical Oscillators: where photons\, phonons and electrons meet\nRésumé : \nAchieving strong mechanical nonlinearities\, minimally invasive detection\, and control at the few-phonon level is a central challenge in the development of mechanical oscillators for quantum technologies\, including quantum information processing (1\,2)\, precision sensing (3)\, and tests of quantum mechanics (4\,5). In our group\, we aim to realize these capabilities using suspended carbon-nanotube mechanical oscillators coupled to electronic quantum dots. In this talk\, I will present results obtained with a device operating in the exotic dispersive ultrastrong-coupling regime (6\,7)\, where the interaction strength between a nanotube mechanical oscillator and a double-quantum-dot electronic two-level system (DQD-ETLS) exceeds the bare energy of the oscillator. In this regime\, we demonstrate a mechanical Kerr oscillator with an anharmonicity exceeding the state of the art for mechanical systems by four orders of magnitude (8). We read out the mechanical states using a superconducting cavity coupled to the square displacement (x²) of the oscillator (8)\, paving the way towards future quantum non-demolition (QND) cavity-based readout of mechanical Fock states (9). I will also show that the decay and decoherence rates of our ETLS charge qubit outperforms the current state of the art for 2DEG-based systems\, reaching the highest coherence values ever measured in a charge-based DQD-ETLS (10). \n1 A. D. O’Connell\, et al. Nature 464 (2010)\n2 Y. Yang\, et al. A mechanical qubit\, 386 (6723) (2024)\n3 F. Pistolesi\, et al. Phys. Rev. X\, 11\, 031027 (2021)\n4 M.F. Gely et al.\, AVS Quantum Sci. 3\, 035601 (2021)\n5 Oriol Romero-Isart. et\, al. Physical Review A\, 84 (2011)\n6 C. Samanta et al\, Nat. Phys. 19 (2023)\n7 P. Forn-Díaz et al.\, Rev. Mod. Phys (2019)\n8 C.B. Moller*\, R.Tormo-Queralt* (under review) 9 P. Arrangoiz-Ariola\, Nature volume 571 (2019)\n10 P. Scarlino Phys. Rev. Lett. 122\, 206802 (2019) \n_ \nContact : equipe-seminaires-nano@listes.grenoble.cnrs.fr
URL:https://sfp-alpes.fr/event/roger-tormo-queralt-institute-of-photonic-sciences-icfo-barcelona-spain/
LOCATION:CNRS – Salle Rémy Lemaire (K223)\, CNRS - Institut Néel 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260617T110000
DTEND;TZID=Europe/Paris:20260617T120000
DTSTAMP:20260618T044742
CREATED:20260611T105930Z
LAST-MODIFIED:20260612T140333Z
UID:10000195-1781694000-1781697600@sfp-alpes.fr
SUMMARY:Mohamed AMDDAH (LPMMC)
DESCRIPTION:Dissipative Dynamics of Phase Slips in SNS Junctions\n_ \nContact : pierre.nataf@lpmmc.cnrs.fr
URL:https://sfp-alpes.fr/event/mohamed-amddah-lpmmc/
LOCATION:LPMMC – salle Roger Maynard (G421)\, CNRS - LPMMC 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260619T110000
DTEND;TZID=Europe/Paris:20260619T120000
DTSTAMP:20260618T044742
CREATED:20260604T132608Z
LAST-MODIFIED:20260604T133618Z
UID:10000184-1781866800-1781870400@sfp-alpes.fr
SUMMARY:Jonathan HOME (ETH Zürich)
DESCRIPTION:Scaling trapped-ion quantum computers\nRésumé : \nTrapped ions are among the most promising paths to realizing quantum computers\, having exhibited the highest fidelity gates and long coherence times. Scaling up will require the adoption of new technologies\, and can be facilitated by new approaches. In this talk I will describe recent work from our group in both directions. Firstly I will describe the use of integrated optics to deliver light to multiple zones of an ion trap chip in scalable manner\, and give an impression of the new types of control which might be enabled by this approach 1\,2\,3. I will then introduce a new concept for scaling trapped-ion quantum computers based on microfabricated Penning traps\, introducing flexible 2-dimensional ion transport while removing the need for high-voltage radio-frequency fields and thus improving compatibility with standardized chip fabrication 4\,5. We have used this to perform sensing of both static and oscillating magnetic and electric fields near the chip surface\, and more recently demonstrated multi-qubit gates and control of multi-dimensional arrays of ions. \n1 K. Mehta et al. Nature 586\, 533–537 (2018)\n2 A. Ricci et al. Phys. Rev. Lett. 130\, 133201 (2023)\n3 C. Mordini et al. Physical Review X 15\, 011040 (2025)\n4 S. Jain et al. Physical Review X 10\, 031027 (2021)\n5 S. Jain et al. Nature 627\, 8004\, pp. 510–514 (2024) \n_ \nContact : michele.filippone@cea.fr
URL:https://sfp-alpes.fr/event/jonathan-home-eth-zurich/
LOCATION:GreenER – Amphi Bergès\, GreenER\, 21 avenue des Martyrs\, Grenoble\, 38031\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260619T140000
DTEND;TZID=Europe/Paris:20260619T160000
DTSTAMP:20260618T044742
CREATED:20260529T145132Z
LAST-MODIFIED:20260529T145509Z
UID:10000175-1781877600-1781884800@sfp-alpes.fr
SUMMARY:Soutenance de Thèse de Marco BIAGI (IRIG/Spintec)
DESCRIPTION:Exploration of orbital-to-spin conversion materials and integration in 3-terminal spin-orbit torque magnetic tunnel junctions\nRésumé : \nThe development of electrically controlled nanomagnets for spintronic applications\, particularly non-volatile magnetic memories (MRAM)\, is attracting strong interest due to the limitations of CMOS-based memories such as SRAM and eDRAM. Spin–orbit torque (SOT) MRAMs are promising candidates for addressing SRAM specifications; however\, current materials still suffer from limited efficiency and high resistivity\, leading to unmet write-current requirements. Recently\, studies have highlighted orbital phenomena as a potential route to enhance SOT efficiency\, owing to their larger magnitudes and availability in a broader set of materials. However\, orbital currents do not couple to magnetization in the absence of spin–orbit coupling\, requiring an orbital-to-spin conversion layer\, which motivates studies of conversion mechanisms and associated physics. \nIn this PhD work\, we evaluate promising orbital/HM/FM material systems for SOTMRAM applications. We present a comprehensive study of Ru/HM/FeCoB and Ta/W/ FeCoB systems\, where Ru and Ta act as orbital current sources\, while Ta\, W\, and Pt serve as orbital-to-spin conversion layers. Ru is predicted to exhibit one of the largest orbital Hall angles among transition metals while maintaining low resistivity. Ta\, a heavy metal with a large spin Hall effect\, is predicted to exhibit an orbital Hall angle approximately one order of magnitude larger than its spin counterpart. When a heavy metal is used as a conversion layer\, multiple spin-current contributions can coexist and add linearly to the total effective spin Hall conductivity\, potentially enhancing the overall SOT efficiency. \nWe characterized key parameters relevant to SOT magnetic tunnel junctions (MTJ) devices\, including saturation magnetization\, effective anisotropy field\, and resistivity\, and we quantified damping-like (ξDL) and field-like (ξFL) SOT efficiencies as a function of orbital and conversion layer thickness\, both in as-deposited and 300°C annealed samples. These metrics are benchmarked against reference HM/FeCoB systems to isolate the effect of the additional orbital layer. For Ru/Ta and Ru/W stacks\, limited enhancement ξFL of ξDL is observed relative to reference systems. In contrast\, Ru/Pt exhibits a twofold increase in ξDL compared to Pt alone. This difference is attributed to the stronger SOC in Pt\, which enables more efficient orbital-to-spin conversion. The independence of ξDL on Ru thickness further suggests an interfacial origin of the orbital contribution in Ru/Pt. However\, thermal annealing strongly degrades ξDL\, limiting its applicability for SOT-MRAM. In Ta/W systems\, we observe a strong enhancement of ξDL by a factor of 4.4 relative to Ta and 3.2 relative to W. A parallel-resistor model indicates that conventional SHE contributions cannot fully account for this increase\, pointing to an additional orbital-related mechanism. Extending the study to 400 °C annealing shows that ξDL remains largely stable\, indicating good thermal robustness while maintaining perpendicular magnetic anisotropy. \nLeveraging these advantages\, we further integrate the Ta/W system into SOT-MTJs and benchmark it against standard W-based MTJs. We investigate the pulse-length dependence of the critical switching current and provide a first demonstration of integrated orbital-to-spin conversion in SOT-MTJs. Ta/W devices exhibit switching currents comparable to W-based devices but have a lower switching current density and improved perpendicular magnetic anisotropy stability. Finally\, we present a proof-of-concept for vertical non-local switching of SOT-MTJ using orbital torques\, simplifying bottom-pinned SOT-MRAM fabrication. Overall\, these results demonstrate that orbital physics can be exploited to enhance SOT-MTJ performance\, simplify fabrication\, and provide a promising route toward scalable bottom-pinned MRAM technologies. \nPlus d’information : https://www.spintec.fr/phd-defense-exploration-of-orbital-to-spin-conversion-materials-and-integration-in-3-terminal-spin-orbit-torque-magnetic-tunnel-junctions/ \nPour suivre la soutenance ​​​en visioconférence : https://univ-grenoble-alpes-fr.zoom.us/j/98769867024?pwd=dXNnT3RMeThjYStybGVQSUN0TVdJdz09 \n_ \n\n\nP​resential access to the confere​nce room at CEA in Gre​​noble requires an entry authorization\, request to admin.spintec@cea.fr
URL:https://sfp-alpes.fr/event/soutenance-de-these-marco-biagi-irig-spintec/
LOCATION:CEA – Salle de Séminaire IRIG (1005 – 445)\, Laboratoire Irig/Spintec\, salle de séminaire 445\, bâtiment 1005\, CEA-Grenoble\, Grenoble
CATEGORIES:Soutenance,Soutenance de Thèse
ORGANIZER;CN="IRIG - CEA":MAILTO:odile.rossignol@cea.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260622T140000
DTEND;TZID=Europe/Paris:20260622T150000
DTSTAMP:20260618T044742
CREATED:20260522T124820Z
LAST-MODIFIED:20260522T124835Z
UID:10000160-1782136800-1782140400@sfp-alpes.fr
SUMMARY:Maurizio SACCHI (CNRS - Institut des NanoSciences de Paris and Synchrotron SOLEIL)
DESCRIPTION:X-rays with Orbital Angular Momentum for spectroscopy and imaging\nRésumé : \nIn addition to the spin angular momentum (SAM) associated to the light polarization\, Laguerre-Gaussian light beams carry also an orbital angular momentum (OAM) of ℓ /photon [1]ℏ associated to an azimuthal dependence exp(iℓϕ) of the electric field phase. Over the last thirty years\, OAM beams at vis-IR wavelengths found applications in fields as different as biology\, telecommunication and imaging [2]. The azimuthal phase dependence\, with a singularity on the propagation axis\, is accompanied by a radial modulation of the intensity (ring-shaped beams)\, properties that have been used to modify local magnetic ordering\, to improve the spatial resolution in microscopy\, and to enhance the edge sharpness in phase-contrast imaging. \nOver the last decade\, several approaches to the generation of OAM beams at shorter wavelengths\, from XUV to hard x-rays\, were proposed. Potential applications are often based on the extrapolation of previous work carried out in the vis-IR range. For instance\, as for the SAM\, the handedness imposed by the OAM has been exploited to study magnetic materials [3] and chiral molecules [4]. The interest of extending the use of OAM beams from the vis-IR to the x-ray range has been growing steadily over the last few years. Nonetheless\, the offer of user accessible beamlines and endstations remains limited\, especially when one aims at independently varying both SAM and OAM in a controlled way. At the SEXTANTS beamline of the SOLEIL synchrotron\, we have implemented and commissioned a new setup for soft x-ray spectroscopy (absorption and resonant scattering experiments) with OAM beams [5]. \n1. L. Allen at al.\, Orbital angular momentum of light and the transformation of Laguerre-Gaussian laser modes\, Phys. Rev. A 45\, 8185 (1992).\n2. Y. Shen et al.\, Optical vortices 30 years on: OAM manipulation from topological charge to multiple singularities\, Light: Science & Applications 8\, 90 (2019).\n3. M. Fanciulli et al.\, Electromagnetic theory of Helicoidal Dichroism in reflection from magnetic structures\, Phys. Rev. A 103\, 013501 (2021); Observation of magnetic helicoidal dichroism with extreme ultraviolet light vortices\, Phys. Rev. Lett. 128\, 077401 (2022); Magnetic vortex dynamics probed by time-resolved magnetic helicoidal\ndichroism\, Phys. Rev.Lett. (2025).\n4. J. R. Rouxel et al.\, Hard X-ray helical dichroism of disordered molecular media\, Nature Phot. 16\, 570 (2022).\n5. P. Carrara et al.\, Soft x-rays with Orbital Angular Momentum for resonant scattering experiments at the SOLEIL synchrotron\, J. Synchr. Rad. 33\, 858 (2026). \nContact : matteo.dastuto@neel.cnrs.fr
URL:https://sfp-alpes.fr/event/maurizio-sacchi-cnrs-institut-des-nanosciences-de-paris-and-synchrotron-soleil/
LOCATION:CNRS – Salle Louis Weil (E424)\, CNRS - Institut Néel 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260623T110000
DTEND;TZID=Europe/Paris:20260623T120000
DTSTAMP:20260618T044742
CREATED:20260326T142350Z
LAST-MODIFIED:20260326T142357Z
UID:10000111-1782212400-1782216000@sfp-alpes.fr
SUMMARY:Lucas GOEHRING (Nottingham Trent University (UK))
DESCRIPTION:Structure formation in paints and coatings\nRésumé : \nPaints and coatings are typically a mix of small particles\, like pigments\, along with a polymer glue or binder. Similar products include inks\, varnishes\, cosmetics\, ceramics and even the lithium-ion battery electrodes that power modern electric vehicles. These materials are prepared as a liquid\, spread over a surface\, and dried.  As anyone who has painted a wall will know\, however\, this process can easily go wrong. Even a well-prepared paint can develop an undesirable skin and wrinkle\, crack\, or peel\, and these coatings can also visibly degrade over time. \nIn this talk I will go through the key stages of film formation\, or how a colloidal dispersion dries.  I will show how small angle scattering experiments (SANS/SAXS) helped to elucidate how the structure of the film changes during drying\, evolving from a dilute gas of particles\, into a transient gel where capillary pressures balance electrostatic repulsion\, to a final aggregated solid. I will then turn to look at how the insight gained has led to a better understanding of mechanical instabilities like fracture\, shear banding\, birefringence\, and peeling\, as well as revealing an unexpected route to colloidal crystallisation. \nFinally\, I will summarise our recent work using neutron scattering techniques to investigate blanching\, a degradation process that can cause a visible whitening in the traditional varnishes that are used as a protective outer coating on many historically and artistically important paintings. \nSpeaker’s website: https://www.ntu.ac.uk/staff-profiles/science-technology/lucas-goehring \n— \nOrsolya Czakkel (College 9 Secretary) \nExternal visitors may ask for a site access to tellier@ill.fr \nZoom link: https://ill.zoom.us/j/95581858117?pwd=hh9paEQj6BF8u9WYzfZkvZaGspe1i3.1  – Passcode: 078610 \n 
URL:https://sfp-alpes.fr/event/lucas-goehring-nottingham-trent-university-uk/
LOCATION:ILL – Salle de Séminaire (110-111)\, ILL 50 71 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260623T140000
DTEND;TZID=Europe/Paris:20260623T160000
DTSTAMP:20260618T044742
CREATED:20260604T144948Z
LAST-MODIFIED:20260604T144948Z
UID:10000190-1782223200-1782230400@sfp-alpes.fr
SUMMARY:Soutenance HDR de Damien CALISTE (CEA-Irig/MEM)
DESCRIPTION:Étude de mécanismes à l’échelle atomique pour les matériaux fonctionnels\, apports de la DFT comme un outils en évolution\nRésumé : \nThe purpose to use numerical tools is to treat problems where the analytical solutions are too complex or unknown. In the field of solid-state physics\, the advent of the Density Functional Theory (DFT) had a major impact on the studies of materials at the atomic scale. Its numerous implementations and ability to efficiently run on large computing infrastructures\, made it popular and it quickly became indispensable in both academic and industrial research\, enabling unprecedented insights into the electronic\, structural\, and chemical properties of complex systems. However\, the power of DFT is not solely derived from its theoretical foundations; it is equally dependent on the robustness\, efficiency\, and adaptability of the computational tools that implement it. ​ \nThis defense will deal with these two aspects: material science through DFT simulations\, and maintainance and development of large numerical infrastructures like a DFT code. ​ \nI will first address how atomistic-level simulations can be used to complement experimental characterisations\, through the example of the indirect role played by Se atoms in the efficiency improvement of CdTe solar panels. Revealing such mechanisms is important for material design\, driving material engineering by knowledge. ​ \nA second part will be dedicated to a broad overview on the physics description of a graphite electrode in a Li-ion battery. Starting from a fully charged anode\, and following the deintercalation process\, I will question what insights we can get from DFT calculations with the existing knowledge obtained from long-passed experiments as from more recent in-operando characterisation results. ​ \n​Studying the dilute regime in graphite intercalation will lead to open questions about the capability of numerical simulations to address cases where the strong interactions between the cations and the host material\, compete with the binding of the layers. To properly address such questions\, it is important to have available within DFT\, a level of theory capable of treating inhomogeneous systems made of places where covalent bonds are dominant while in other areas van der Waals interactions take the lead. These situations can be commonly found in several classes of materials\, from van der Waals heterostructures to hybrid perovskites when out-of-equilibrium processes take place\, with defect / impurity diffusion or phase / structural transitions. The recent developments of versatile meta-GGAs associated to dispersion corrections\, look promising and have demonstrated their ability to reproduce perfect van der Waals systems. Concurrently\, their usage are restricted to some codes\, hindered by the complexity in DFT implementations\, isolating the diffusion of new ideas. I believe that the advent of code generation through AI is a timely opportunity to help spreading state-of-the-art DFT developments. Such thoughts will be discussed in the last part of the defense.​ \n_ \nContact : alain.farchi@cea.fr
URL:https://sfp-alpes.fr/event/soutenance-hdr-de-damien-caliste-cea-irig-mem/
LOCATION:CEA\, entrée principale – Salle de soutenance (bâtiment A2)\, 17\, avenue des Martyrs\, Grenoble\, 38000\, France
CATEGORIES:Soutenance,Soutenance HDR
ORGANIZER;CN="IRIG - CEA":MAILTO:odile.rossignol@cea.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260625T140000
DTEND;TZID=Europe/Paris:20260625T150000
DTSTAMP:20260618T044742
CREATED:20260529T142941Z
LAST-MODIFIED:20260529T143015Z
UID:10000172-1782396000-1782399600@sfp-alpes.fr
SUMMARY:Benjamin BACQ-LABREUIL (IPCMS\, Université Strasbourg)
DESCRIPTION:The Role of the Apical Oxygen in Cuprate High-Temperature Superconductors\nRésumé : \nScanning tunneling microscopy measurements exploiting the natural superstructure modulation of the cuprate superconductor Bi$_2$Sr$_2$CaCu$_2$O$_{8+x}$ (Bi-2212) have revealed a possible correlation between the Cu-apical-O distance and the superconducting order parameter\, as reported recently by O’Mahony et al. [1]. These observations were interpreted as evidence for a direct link between superconductivity and the charge-transfer gap\, and more broadly revived the long-standing question of the role of apical oxygens in cuprate superconductivity. In this talk\, I will discuss the impact of apical oxygen displacement on the superconducting properties of Bi$_2$Sr$_2$CuO$_{6+x}$\, Bi-2212\, and HgBa$_2$CuO$_{4+x}$ [2]\, leveraging a recently developed first-principles framework for high-temperature superconductors [3]. The quantitative agreement between our calculations and experiments allows us to unambiguously attribute the observed variations of superconducting order parameter to changes in the apical distance. We demonstrate\, however\, that the latter controls the former predominantly via the effective hole-doping of the CuO$_2$ planes\, with negligible effect on the charge-transfer gap. The modest magnitude of the order parameter modulation induced by apical-oxygen displacement alone therefore warrants caution in interpreting correlations between $T_c$ and the apical distance inferred from comparisons across different cuprate compounds. \n[1] O’Mahony\, et al.\, Proc. Natl. Acad. Sci. 119\, e2207449119 (2022) \n[2] S. Vadnais\, et al.\, arXiv:2601.16017 (2026) \n[3] B. Bacq-Labreuil\, et al.\, Phys. Rev. X 15\, 021071 (2025) \n_ \nContact : florence.levy-bertrand@neel.cnrs.fr 
URL:https://sfp-alpes.fr/event/benjamin-bacq_labreuil-ipcms-universite-strasbourg/
LOCATION:CNRS – Salle Rémy Lemaire (K223)\, CNRS - Institut Néel 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260625T140000
DTEND;TZID=Europe/Paris:20260625T150000
DTSTAMP:20260618T044742
CREATED:20260521T145948Z
LAST-MODIFIED:20260521T145948Z
UID:10000158-1782396000-1782399600@sfp-alpes.fr
SUMMARY:Ismaele Vincent MASIELLO (TU WIEN\, Austria)
DESCRIPTION:Nonclassicality\, quasiprobabilities and weak values explored in neutron interferometry\nRésumé : \nThe violation of Bell inequalities has demonstrated that quantum mechanics exhibits features with no classical counterpart; however\, identifying the boundary between quantumness and classicality remains a nontrivial task. Quasiprobability representations and weak values are valuable tools for investigating these boundaries\, and their physical relevance has been confirmed across a range of impactful experiments. Several of these experiments have been implemented in neutron interferometry\, a platform that has historically played a central role in the study of foundational quantum mechanics and nonclassicality. Compared to typical photonic implementations\, it is less susceptible to classical reinterpretations\, as it involves a single massive particle in a superposition of two or three spatially separated paths. Moreover\, it offers several experimental advantages\, such as macroscopic beam separation\, individual control of the sub-beams\, and long interaction and coherence times at room temperature and ambient pressure. In this talk\, I will introduce weak values and quasiprobabilities as tools to investigate the quantum–classical boundary and present results obtained in neutron interferometry.\n_ \nHanno Filter (College 3 Secretary) \nExternal visitors may ask for a site access to tellier(at)ill.fr \nZoom link : https://ill.zoom.us/j/98964195699?pwd=vPhNT17CAeoDUr7QX4PjfyPnWsHuMU.1 – Password : SeminarC3 \n  \n 
URL:https://sfp-alpes.fr/event/ismaele-vincent-masiello-tu-wien-austria/
LOCATION:ILL – Salle de Séminaire (110-111)\, ILL 50 71 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260626T110000
DTEND;TZID=Europe/Paris:20260626T120000
DTSTAMP:20260618T044742
CREATED:20260604T145405Z
LAST-MODIFIED:20260604T145405Z
UID:10000191-1782471600-1782475200@sfp-alpes.fr
SUMMARY:Christophe MASSELON (CEA-Irig/BGE) et Vincent AGACHE (CEA-Leti/DTIS)
DESCRIPTION:Sensing Mass at the Nanoscale : Suspended Nanochannel Resonators and NEMS-MS for Biology\nRésumé : \n\nDetermining the mass of biological nanoparticles opens new avenues for characterizing biological systems at their own scale. In this joint seminar\, researchers from LETI and IRIG will present two complementary nanoresonator platforms : Suspended Nanochannel Resonators (SNR)\, which operate in solution\, and Nanoelectromechanical Mass Spectrometry (NEMS-MS)\, which operates in the gas phase. Together\, these technologies cover a range of biological particles\, from lipid nanoparticles and extracellular vesicles to viral particles. Beyond the technical principles underlying each platform\, selected applications will illustrate the potential of these approaches for the characterization of biological samples.​​​​​\n​\n\n\n\nLes séminaires et soutenances sont ouverts à tous\, notez toutefois que l’accès au campus EPN nécessite un avis de rendez-vous. Merci de remplir ce formulaire  et de l’adresser\, plus de 48h à l’avance\, à ce contact.\nPensez à vous munir d’une pièce d’identité le jour de votre visite.
URL:https://sfp-alpes.fr/event/christophe-masselon-cea-irig-bge-et-vincent-agache-cea-leti-dtis/
LOCATION:IBS – Salle des séminaires\, IBS 71 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
ORGANIZER;CN="IRIG - CEA":MAILTO:odile.rossignol@cea.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260629T140000
DTEND;TZID=Europe/Paris:20260629T150000
DTSTAMP:20260618T044742
CREATED:20260604T134030Z
LAST-MODIFIED:20260604T134030Z
UID:10000185-1782741600-1782745200@sfp-alpes.fr
SUMMARY:Dario DAGHERO (Department of Applied Science and Technology\, Politecnico di Torino)
DESCRIPTION:Point Contact Andreev-Reflection Spectroscopy : mechanisms\, models and examples\nRésumé : \nPoint-contact spectroscopy [1] in superconductors\, also known as point-contact Andreev-Reflection spectroscopy (PCARS) is a simple but powerful and versatile technique that allows a direct determination of the number\, the amplitude and the symmetry of the energy gap(s) in superconducting materials [2\,3]. The technique is rather simple in principle\, i.e. it just consists in creating a small (point-like) contact between a normal metal and a superconductor\, and to measure its differential conductance as a function of the bias voltage across the junction. However\, there are several complications that make this simple recipe fairly difficult to realize in practice. First of all\, the contact must be in the spectroscopic regime [1\,2\,3]\, i.e. electrons from the normal metal must be injected in the superconductor with an excess energy that coincides with eV\, V being the bias voltage. Hence\, they must not lose energy in the banks and in the contact itself. The ideal condition is that of ballistic conduction through the N/S interface\, which ensures no Joule effect and requires in turns that the contact size is smaller than both the coherence length and the electronic mean free path in the superconductor.\nWhen these conditions are met\, the conduction through the contact is dominated by Andreev reflection\, a quantum phenomenon that is responsible for the conversion of the normal current into supercurrent\, and occurs in a specific range of voltages (electron energies) set by the amplitude of the superconducting gap. Several models have been proposed to describe the phenomenon and are currently used to extract information on the amplitude and symmetry of the order parameter from the spectra. The simplest one [4] was only suited for superconductors with an isotropic (s-wave) gap\, but has been successfully generalized to the case of layered materials with anisotropic gaps\, like cuprates [5\,6] or strontium ruthenate [7]) and finally to the 3D case\, while taking into account the shape of the actual Fermi surface [3]. The latter generalization allows calculating the point-contact spectrum for any symmetry of the order parameter\, including exotic ones with horizontal node lines.\nAfter discussing these general aspects\, I will briefly describe the application of the technique to some example materials\, from the conventional multiband superconductors MgB2 [8] to unconventional ones like Pu-based heavy fermion compounds [9] or Fe-based compounds [3]\, to transition-metal dichalcogenides [10]. \nReferences\n1. Y. G. Naidyuk and I. K. Yanson\, Point-Contact Spectroscopy\, Springer Series in Solid-State Sciences\, Vol. 145 (Springer\, 2004).\n2. D. Daghero and R.S. Gonnelli\, Supercond. Sci. Technol. 23\, 043001 (2010).\n3. D. Daghero et al.\, Rep. Prog. Phys. 74\, 124509 (2011).\n4. G. E. Blonder\, M. Tinkham and T. M. Klapwijk\, Phys. Rev. B 25\, 4515 (1982)\n5. Y. Tanaka and S. Kashiwaya\, Phys. Rev. Lett. 74\, 3451 (1995)\n6. S. Kashiwaya and Y. Tanaka\, Rep. Prog. Phys. 63\, 1641 (2000).\n7. M. Yamashiro\, Y. Tanaka\, and S. Kashiwaya\, Phys. Rev. B 56\, 7847 (1997)\n8. R. S. Gonnelli et al.\, Phys Rev. Lett. 89\, 247004 (2002)\n9. D. Daghero et al.\, Nature Communications 3\, 786 (2012)\n10. E. Piatti et al.\, Materials Today Physics 59 (2025) 101883 \n_ \nContact : matteo.dastuto@neel.cnrs.fr
URL:https://sfp-alpes.fr/event/dario-daghero-department-of-applied-science-and-technology-politecnico-di-torino/
LOCATION:CNRS – Salle Louis Weil (E424)\, CNRS - Institut Néel 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260630T103000
DTEND;TZID=Europe/Paris:20260630T113000
DTSTAMP:20260618T044742
CREATED:20260326T145827Z
LAST-MODIFIED:20260326T145855Z
UID:10000113-1782815400-1782819000@sfp-alpes.fr
SUMMARY:Carlotta PORZIO (CERN\, Switzerland)
DESCRIPTION:Experimental activities at the ISOLDE-CERN facility\nRésumé : \nThe ISOLDE factily at CERN is one of the world-leading laboratories for the production of radioactive ion beams (RIBs) with the ISOL (Isotope Separation On-Line) method. More than 1000 isotopes of over 70 chemical elements have been produced via the interaction of a 1.4 GeV proton beam with a variety of target materials. After ionization and mass separation\, the beams can be delivered at low energy or post-accelerated up to about 10 MeV/u using the HIE-ISOLDE linear accelerator. The facility supports a broad scientific program\, spanning nuclear structure studies\, nuclear astrophysics\, materials science\, life sciences\, and investigations of fundamental interactions. \nAmong the experimental setups available at HIE-ISOLDE\, the Miniball gamma-ray spectrometer is employed to investigate both collective and single-particle properties of exotic nuclei. Combined with the post-accelerated radioactive ion beams\, Miniball enables nuclear structure studies via Coulomb excitation and nucleon-transfer reactions. \nThis seminar will provide an introduction to the ISOLDE facility and the ISOL RIB production method\, and an overview of experimental setups and techniques\, with a focus on the Miniball spectrometer. \n— \nHanno Filter (College 3 Secretary \nExternal visitors may ask for a site access to tellier@ill.fr \n 
URL:https://sfp-alpes.fr/event/carlotta-porzio-cern-switzerland/
LOCATION:ILL – Salle de Séminaire (110-111)\, ILL 50 71 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260707T140000
DTEND;TZID=Europe/Paris:20260707T160000
DTSTAMP:20260618T044742
CREATED:20260611T110542Z
LAST-MODIFIED:20260611T110651Z
UID:10000196-1783432800-1783440000@sfp-alpes.fr
SUMMARY:Soutenance de Thèse par Hanna KARAOUI (CEA-Irig/Spintec)
DESCRIPTION:Perpendicular anisotropy interfaces for high-efficiency low power spintronics\nRésumé : \nL’augmentation de la consommation mondiale d’énergie accentue le besoin de stockage de données à haute efficacité\, orientant la recherche vers des mémoires non volatiles à faible puissance comme la MRAM (Magnetoresistive Random Access Memory) à couple de transfert de spin. Les jonctions tunnel magnétiques (MTJ) perpendiculaires conventionnelles font face à un compromis critique lors de la réduction d’échelle\, l’anisotropie magnétique d’interface diminue\, imposant un dilemme entre stabilité thermique et efficacité de commutation. Les structures doubles-MTJ (DMTJ) répondent théoriquement à ce problème en insérant la couche de stockage (SL) entre deux barrières de MgO\, bien qu’elles souffrent souvent d’une fabrication complexe et de l’instabilité des couches de référence supérieures. Cette thèse étudie une architecture innovante nommée ASL-DMTJ\, où le polariseur fixe supérieur est remplacé par une couche d’assistance magnétique (ASL) à aimantation libre. Cette ASL interagit dynamiquement avec la couche de stockage par couple de transfert de spin et couplage ferromagnétique\, renforçant la stabilité par alignement magnétostatique et permettant une rétention élevée ainsi qu’une commutation à très faible puissance. Afin d’évaluer les performances via l’intégration de cette ASL\, un cadre de modélisation macrospin complet a été établi pour étudier les propriétés magnétostatiques et dynamiques. L’analyse du profil énergétique démontre que la stabilité thermique du système dépend de l’anisotropie interfaciale liée à l’épaisseur et du couplage dipolaire mutuel. Tandis que la réduction de l’épaisseur de la SL diminue intrinsèquement la barrière d’énergie\, l’inclusion du couplage dipolaire renforce la stabilité globale en favorisant les configurations parallèles\, agissant comme un mécanisme vital pour la rétention des données. Des investigations numériques mettent en évidence un mécanisme de commutation par étapes où la SL bénéficie des couples cumulatifs fournis par les couches de référence et d’assistance\, garantissant que la SL reste la couche la plus stable tandis que l’ASL facilite le renversement. Sur le plan expérimental\, une étude comparative démontre que les structures à double MgO offrent des propriétés de transport nettement améliorées par rapport aux implémentations à triple MgO en éliminant la résistance parasite. En optimisant l’épaisseur et l’oxydation de la barrière tunnel\, des valeurs de magnétorésistance tunnel optimisées ont été obtenues. L’utilisation systématique d’échantillons en double-MgO avec l’interface inférieure FeCoB/MgO sert de barrière principale\, tandis que l’interface supérieure est cruciale pour maximiser le champ d’anisotropie effectif. L’optimisation des matériaux a confirmé que les échantillons conservant une couche magnétique à l’interface MgO supérieure offrent une stablité dépassant le seuil de stabilité thermique requis de 40kBT avec une symétrie de commutation élevée. Enfin\, l’efficacité de commutation a été quantifiée via les distributions du taux d’erreur d’écriture sur des impulsions allant de 4 ns à 10 µs. Nous avons introduit un modèle unifié capturant la dépendance de la tension critique par rapport à la largeur d’impulsion à travers les régimes balistiques et thermiquement assistés. Ce modèle identifie un seuil de commutation caractéristique centré sur le point d’énergie minimale\, introduisant une nouvelle figure de mérite\, le rapport entre la barrière de stabilité thermique et l’énergie de commutation minimale\, fournissant une estimation plus précise de l’énergie opérationnelle. Les résultats expérimentaux ont montré une dépendance linéaire de la barrière d’énergie vis-à-vis du diamètre\, prouvant un mécanisme de commutation régi par la nucléation de domaines et la propagation de parois plutôt que par un modèle macrospin pur. Les calculs analytiques et expérimentaux confirment que les champs de fuite de la couche de référence modulent significativement ces barrières. \nLa hausse de la consommation énergétique mondiale pousse au développement de mémoires plus sobres comme la MRAM (Magnetoresistive Random Access Memory). Mais en dessous de 20 nm\, les jonctions magnétiques classiques perdent en stabilité ou en efficacité. Cette thèse étudie une architecture innovante\, appelée ASL-DMTJ\, où une couche magnétique d’assistance aide la couche de stockage à conserver l’information tout en facilitant l’écriture avec peu d’énergie. Des modèles montrent que les interactions magnétiques internes renforcent la stabilité malgré la miniaturisation. Les expériences confirment que des structures à double barrière MgO améliorent les performances et réduisent les pertes. Un nouveau modèle de commutation est aussi proposé pour mieux estimer l’énergie nécessaire. Ces travaux ouvrent la voie à des mémoires plus petites\, rapides et économes en énergie.Face à l’explosion de la consommation numérique\, nos appareils ont besoin de mémoires plus économes. La technologie MRAM est une candidate idéale car elle conserve les données sans électricité. Cependant\, miniaturiser ces mémoires réduit leur stabilité \, les données risquent de s’effacer. Cette thèse explore une architecture innovante\, la “ASL-DMTJ”. L’idée est d’entourer la couche de stockage d’informations par deux barrières protectrices et d’ajouter une couche d’assistance magnétique. Cette dernière agit comme un guide dynamique qui aide à l’écriture des données tout en renforçant leur maintien dans le temps. En combinant simulations numériques et tests réels\, ces travaux prouvent que ce design permet de créer des mémoires ultra-stables et rapides. L’étude montre aussi que le basculement de l’information se passe à point d’énergie minimale\, offrant une grande efficacité énergétique. Ce nouveau modèle architectural permet d’envisager des technologies dont la consommation électrique serait drastiquement réduite. \nPlus d’information \nPour suivre la soutenance ​​​en visioconférence zoom​  ​​ –  Meeting ID : 987 6986 7024 – Passcode : 025918​ \n_ \n\n\nATTENTION ! L’entrée du site CEA-Grenoble nécessite une autorisation préalable et sur présentation de votre pièce d’identité le jour de votre venue (CI ou passeport\, car le permis de conduire n’est pas recevable).\nVeuillez impétaivement nous contacter par mail avant le 26 juin : admin.spintec@cea.fr​Note: Entry to the CEA-Grenoble site requires prior authorization and the presentation of your ID on the day of your visit (ID card or passport; driver’s licenses are not accepted).\nPlease request this authorization before June 26th to admin.spintec@cea.fr​
URL:https://sfp-alpes.fr/event/soutenance-de-these-par-hanna-karaoui-cea-irig-spintec/
LOCATION:CEA – Salle de Séminaire IRIG (1005 – 445)\, Laboratoire Irig/Spintec\, salle de séminaire 445\, bâtiment 1005\, CEA-Grenoble\, Grenoble
CATEGORIES:Soutenance,Soutenance de Thèse
ORGANIZER;CN="IRIG - CEA":MAILTO:odile.rossignol@cea.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260907T000000
DTEND;TZID=Europe/Paris:20260911T235959
DTSTAMP:20260618T044742
CREATED:20260611T112251Z
LAST-MODIFIED:20260611T112251Z
UID:10000197-1788739200-1789171199@sfp-alpes.fr
SUMMARY:Recent Advances in Quantum Integrable Systems 2026 (RAQIS)
DESCRIPTION:The conference aims at bringing in contact people working on various aspects of Quantum Integrable Systems\, including applications to Statistical Physics\, Condensed Matter and Field Theories.\nThe registration to the conference can be done through the website https://indico.in2p3.fr/event/38960/ \n\nIt will be closed on July 31th\, 2026. \nNote also that the early fees period will end by the end of June 2026. \nFees include lunches\, conference banquet and coffea breaks.\n_\n\nContact : raqis@lapth.cnrs.fr
URL:https://sfp-alpes.fr/event/recent-advances-in-quantum-integrable-systems-2026-raqis/
LOCATION:LAPTh – Auditorium\, 9\, chemin de Bellevue\, Annecy\, 74940\, France
CATEGORIES:Conférence,Evènements
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261008T160000
DTEND;TZID=Europe/Paris:20261008T170000
DTSTAMP:20260618T044742
CREATED:20260409T110848Z
LAST-MODIFIED:20260409T110853Z
UID:10000124-1791475200-1791478800@sfp-alpes.fr
SUMMARY:Cecile ENGRAND
DESCRIPTION:Les micrométéorites : les messagères de notre origine\n_ \nToutes les informations sont disponibles sur : https://indico.ijclab.in2p3.fr/event/13491/ \nContact : louis.fayard@IJCLAB.INP3.FR \n  \n 
URL:https://sfp-alpes.fr/event/cecile-engrand/
LOCATION:Laboratoire IJCLab – Auditorium Pierre Lehmann\, Rue Ampère\, Orsay cedex\, 91898\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20261015T160000
DTEND;TZID=Europe/Paris:20261015T170000
DTSTAMP:20260618T044742
CREATED:20260409T111456Z
LAST-MODIFIED:20260409T111459Z
UID:10000125-1792080000-1792083600@sfp-alpes.fr
SUMMARY:Christophe SALOMON
DESCRIPTION:Atomes froids et mesure précise du temps\n_ \nToutes les informations sont disponibles sur : https://indico.ijclab.in2p3.fr/event/13426/ \nContact : louis.fayard@IJCLAB.INP3.FR
URL:https://sfp-alpes.fr/event/christophe-salomon/
LOCATION:Laboratoire IJCLab – Auditorium Pierre Lehmann\, Rue Ampère\, Orsay cedex\, 91898\, France
CATEGORIES:Séminaire
END:VEVENT
END:VCALENDAR