Javier CAMPO (Aragón Nanoscience and Materials Institute (CSIC - Universidad de Zaragoza) Zaragoza, Spain)
2026-04-08 14:00 - 15:00 (Europe/Paris) | ILL – Salle de Séminaire (110-111), ILL 50 71 avenue des Martyrs, Grenoble, 38042, France
A new magnetic state, “B-Phase”, found in MnSi at Low Temperatures
Résumé :
In cubic chiral magnets, Dzyaloshinskii-Moriya (DM) interactions within the chiral crystal structure result in diverse magnetic textures, including skyrmion lattices (SkL) and chiral soliton lattices, which hold promise for spintronic and magnonic devices. Among these, MnSi has been extensively studied due to the SkL formation in the so-called “A-phase” just below Tc [1]. Recently, it was suggested theoretically that at low temperatures (T), the conical helimagnetic (CH) and forced-ferromagnetic (FFM) phases in MnSi might not be directly connected but separated by another SkL phase, possibly metastable, or a new phase of unknown nature near the critical magnetic field (Bc) [2]. The theoretical prediction of the new SkL phase at low T is in good agreement with the experiments reported in MnSi and Cu2OSeO3 [3,4]. On the other hand, by using careful ac susceptibility measurements at low temperature, we determined the magnetic phase diagrams of oriented crystals of MnSi [5]. A new unexpected region, termed “B-phase”, was observed when the magnetic field was applied along the main diagonal <111>.
To clarify the nature of the “B-phase”, we performed small-angle neutron scattering (SANS) measurements at TAIKAN in J-PARC and transverse field (TF)-μSR experiments at TRIUMF. At low temperatures and fields near Bc, SANS patterns revealed two peaks along the horizontal axis, corresponding to the magnetic Bragg peaks of the CH state. Notably, no diffraction peaks indicative of a six-fold-symmetric SkL were observed. Meanwhile, μSR results showed a distinct internal magnetic field distribution in the “B-phase”, different from those in the CH or FFM phases, suggesting that the “B-phase” could involve a reorientation of Mn helices within the unit cell.
In the presentation, we will discuss these SANS and μSR findings in detail and their implications for understanding the spin texture in the “B-phase”.
References

S. Mühlbauer et al., Science 323, 915 (2009).
V. Laliena and J. Campo, Phys. Rev. B 96, 134420 (2017).
T. Nakajima et al., Sci. Adv. 3, e1602562 (2017).
A. Chacon et al., Nature Phys 14, 936–941 (2018).
M. Ohkuma et al., APL Mater. 10, 041104 (2022).

College 5B Secretary
Alberto Rodriguez Velamazan
External visitors may ask for a site access to Brigitte Dubouloz (dubouloz@ill.fr)

Gonzalo PEREZ-BLASCO (Aragón Nanoscience and Materials Institute (CSIC - Universidad de Zaragoza) - Physics Condensed Matter Dept. Zaragoza, Spain)
2026-04-09 14:00 - 15:00 | ILL – Salle de Séminaire (110-111), ILL 50 71 avenue des Martyrs, Grenoble, 38042, France
Empirical machine learning for 3He spin-filter polarisation decay
Résumé :
A lightweight, empirical machine-learning framework is presented for predicting the time evolution of the nuclear polarisation of 3He spin-filter cells under realistic neutron beam line conditions. The method bridges the gap between detailed microscopic modelling of polarisation relaxation and purely heuristic correction schemes by combining supervised learning with basic physics-informed constraints on spin relaxation. This strategy ensures physically consistent polarisation forecasts while maintaining computational efficiency and ease of implementation.
The framework is tailored to the limited number of heterogeneous experimental datasets typically encountered during routine instrument operation. Rather than explicitly modelling all relaxation mechanisms, it learns an effective representation of polarisation decay directly from experimental data. Within the domain spanned by the training dataset, the model demonstrates stable predictive performance while preserving the expected exponential relaxation behaviour and accommodating non-linear, history-dependent effects.
The resulting predictions enable reliable, time-dependent corrections of neutron scattering data affected by polarisation efficiency drift. Compared with traditional single-parameter relaxation models, the approach accounts for the combined influence of multiple experimental parameters and their temporal evolution. Although extrapolation beyond the training domain requires careful validation, the method provides an operationally efficient and reproducible tool for polarisation monitoring and correction in realistic experimental environments.

College 6 Secretary
Gabriel Cuello
External visitors may ask for a site access to Brigitte Dubouloz (dubouloz@ill.fr)

Juan Bautista CARDA-CASTELLO (Inorganic and Organic Chemistry Department, Universitat Jaume I, Castellón (Spain))
2026-04-17 14:00 - 15:00 | LMGP – salle des séminaires, Grenoble INP -Phelma 3 parvis Louis Néel, Grenoble, 38054, France
Scientific and Technological Innovations in the Ceramic Industry
Résumé :
The conference “Scientific and Technological Innovations in the Ceramic Industry” will provide a concise overview of recent advances in ceramic materials, processing technologies, and new technological opportunities for the ceramic sector. It will examine the technological and economic relevance of the ceramic industry, together with the key properties that make ceramic materials attractive for advanced uses. Particular attention will be paid to ceramic coating deposition techniques and high-temperature sintering processes, as well as to processing routes such as laser zone melting or physical vapor deposition (PVD), whose application offers new possibilities for the ceramic industry. The lecture will also discuss application fields such as photovoltaics, catalysis, and other functional technologies, which represent expanding areas of interest for the ceramic sector. Overall, the presentation will show how innovation is broadening the industrial scope of ceramics beyond their traditional uses.
Short Bio/CV
Juan Bautista Carda Castelló is a Full Professor of Inorganic Chemistry, Head of the Solid State Chemistry Research Group and Director of the “Ciutat de Vila-real” Chair of Ceramic Innovation at Universitat Jaume I in Castellón (Spain). With a highly distinguished academic, scientific, and institutional career, he has developed an outstanding record in research, teaching, and technology transfer, with more than 300 scientific publications, numerous patents, and extensive participation in national and international research projects. He has supervised more than 35 PhD theses, promoted collaborations with universities and technological centers worldwide, and received several major distinctions for his contribution to science and ceramic innovation. His career has made him a leading figure in the fields of solid-state chemistry and ceramic technology.
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Contact : deborah.verger@grenoble-inp.fr

Klaus DIETERICH (génétique), Martial MALLARET (neurologue) & Céline BIBOULET BRUNEAU (neuropédiatre) - Service : Centre de référence neuro-musculaire)
2026-04-23 08:00 - 09:00 | CHU – Salle Gilbert Faure, CHU Grenoble Alpes Pavillon Vercors (côté Belledonne), La Tronche, 38043, France
Maladies neuromusculaires rares : comment la thérapie génique change la prise en charge de l’amyotrophie spinale
Contact : sante-communication@univ-grenoble-alpes.fr

Anamaria NESCULEA (LBBE - Lyon)
2026-04-23 13:00 - 14:00 | IMAG – Salle de Réunion, 150 place du Torrent, St Martin d’Hères, 38400, France
TITRE A VENIR
Contact : lucie.lamothe@univ-grenoble-alpes.fr

Pierre CAPLIER (Directeur adjoint du centre CEA de Grenoble)
2026-04-24 12:30 - 13:15 | Amphi Minatec, 3 parvis Louis Néel, Grenoble, 38054, France
70 ans du centre CEA de Grenoble : flashback sur l’histoire du centre et ses évolutions
Résumé :
A VENIR
Contact : giant.campus@cea.fr

Elizabeth TILLY (University of New Mexico)
2026-04-28 14:00 - 15:00 | ILL – Salle de Séminaire (110-111), ILL 50 71 avenue des Martyrs, Grenoble, 38042, France
Directional Detection as a Tool for Rare-Event Searches
Résumé :
Measuring the initial scattering angle of a particle track provides powerful discrimination in rare-event searches and can enhance detector characterization. The Migdal effect–characterized by a nuclear recoil and an electron recoil originating from the same vertex–is an inherently directional signal. In this talk, I will present my work with the Migdal In Galactic Dark mAtter expLoration (MIGDAL) experiment which uses a GEM-based TPC. I will discuss the development of our 3D track reconstruction algorithms and studies exploiting its angular resolution to characterize detector response. I will also discuss measurements of drift properties in negative ion drift gas mixtures, maximizing noble gas components with the aim of improving spatial resolution for MIGDAL Phase II. Together these demonstrate the power and versatility of precise directional track reconstruction for next-generation rare-event searches.
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Hanno Filter (College 3 Secretary)
External visitors may ask for a site access to tellier@ill.fr

Emilie GAGNEPAIN & Vincent DATRY (Service : Clinique de Chirurgie Thoracique et Endocrinienne)
2026-04-30 08:00 - 09:00 | CHU – Salle Gilbert Faure, CHU Grenoble Alpes Pavillon Vercors (côté Belledonne), La Tronche, 38043, France
Découverte fortuite, décision réfléchie : l’incidentalome surrénalien en pratique
Contact : sante-communication@univ-grenoble-alpes.fr

Perrine BOUCHEIX & Marc PADILLA (Service : Unité de coordination de don d'organes)
2026-05-21 08:00 - 09:00 | CHU – Salle Gilbert Faure, CHU Grenoble Alpes Pavillon Vercors (côté Belledonne), La Tronche, 38043, France
Don d’organes : tous concernés !
Contact : sante-communication@univ-grenoble-alpes.fr

Sophie GUERON
2026-06-04 16:00 - 17:00 | Laboratoire IJCLab – Auditorium Pierre Lehmann, Rue Ampère, Orsay cedex, 91898, France
Explorer les isolants topologiques avec la physique mésoscopique
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Toutes les informations sont disponibles sur : https://indico.ijclab.in2p3.fr/event/12406/
Contact : louis.fayard@IJCLAB.INP3.FR

Lucas GOEHRING (Nottingham Trent University (UK))
2026-06-23 11:00 - 12:00 | ILL – Salle de Séminaire (110-111), ILL 50 71 avenue des Martyrs, Grenoble, 38042, France
Structure formation in paints and coatings
Résumé :
Paints 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.
In 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.
Finally, 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.
Speaker’s website: https://www.ntu.ac.uk/staff-profiles/science-technology/lucas-goehring
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Orsolya Czakkel (College 9 Secretary)
External visitors may ask for a site access to tellier@ill.fr
Zoom link: https://ill.zoom.us/j/95581858117?pwd=[REDACTED] – Passcode: [REDACTED]

Carlotta PORZIO (CERN, Switzerland)
2026-06-30 10:30 - 11:30 | ILL – Salle de Séminaire (110-111), ILL 50 71 avenue des Martyrs, Grenoble, 38042, France
Experimental activities at the ISOLDE-CERN facility
Résumé :
The 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.
Among 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.
This 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.
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Hanno Filter (College 3 Secretary
External visitors may ask for a site access to tellier@ill.fr
