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DTSTART;TZID=Europe/Paris:20260408T093000
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DTSTAMP:20260408T012459
CREATED:20260402T160829Z
LAST-MODIFIED:20260402T160835Z
UID:10000120-1775640600-1775647800@sfp-alpes.fr
SUMMARY:Soutenance d'HDR de Marie-Aude MEASSON (Institut Néel\, équipe MagSup)
DESCRIPTION:Matériaux Quantiques en Conditions Extrêmes : Modes Collectifs et Ordres Quantiques Exotiques\nRésumé : A VENIR… \nPrésentation en français \n_ \nContact : marie-aude.measson@neel.cnrs.fr
URL:https://sfp-alpes.fr/event/soutenance-dhdr-de-marie-aude-measson-institut-neel-equipe-magsup/
LOCATION:CNRS – Bâtiment A\, CNRS - Institut Néel 25 avenue des Martyrs\, Grenoble\, 38054\, France
CATEGORIES:Soutenance,Soutenance HDR
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DTSTART;TZID=Europe/Paris:20260408T140000
DTEND;TZID=Europe/Paris:20260408T150000
DTSTAMP:20260408T012459
CREATED:20260320T150834Z
LAST-MODIFIED:20260320T151400Z
UID:10000106-1775656800-1775660400@sfp-alpes.fr
SUMMARY:Javier CAMPO (Aragón Nanoscience and Materials Institute (CSIC - Universidad de Zaragoza)  Zaragoza\, Spain)
DESCRIPTION:A new magnetic state\, “B-Phase”\, found in MnSi at Low Temperatures \nRésumé : \nIn 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>. \nTo 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. \nIn the presentation\, we will discuss these SANS and μSR findings in detail and their implications for understanding the spin texture in the “B-phase”. \nReferences \n\nS. Mühlbauer et al.\, Science 323\, 915 (2009).\nV. Laliena and J. Campo\, Phys. Rev. B 96\, 134420 (2017).\nT. Nakajima et al.\, Sci. Adv. 3\, e1602562 (2017).\nA. Chacon et al.\, Nature Phys 14\, 936–941 (2018).\nM. Ohkuma et al.\, APL Mater. 10\, 041104 (2022).\n\n  \nCollege 5B Secretary \nAlberto Rodriguez Velamazan \nExternal visitors may ask for a site access to Brigitte Dubouloz (dubouloz@ill.fr)
URL:https://sfp-alpes.fr/event/javier-campo-aragon-nanoscience-and-materials-institute-csic-universidad-de-zaragoza-zaragoza-spain/
LOCATION:ILL – Salle de Séminaire (110-111)\, ILL 50 71 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
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