Magnetic Hysteresis of the Skyrmion Lattice in MnSi
ORAL
Abstract
Understanding the complex dynamics of skyrmion formation and destruction is key to developing new technologies which make use of them. Here we report the observation of a hysteresis effect associated with forming and destroying the SkL in the chiral magnet MnSi using small angle neutron scattering (SANS). This effect is very small when compared to the applied field of the cryomagnet (~ 1 mT vs 200 mT), but is observable and reproducable by the added precision of a custom built solenoid supplementing the cryomagnet. This hysteresis effect is due to an intrinsic energy barrier associated with forming and destroying the SkL. We have explored the time dependence and magnetic history dependence of the phenomenon to better understand its origin, which we believe to be related to the intrinsic topological energy barrier associated with forming the skyrmions.
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Presenters
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Allan Leishman
University of Notre Dame
Authors
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Allan Leishman
University of Notre Dame
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Morten Eskildsen
University of Notre Dame
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Marc Janoschek
Los Alamos National Laboratory, LANL
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Eric Bauer
Los Alamos National Laboratory, Los Alamos, NM 87545, USA, Los Alamos National Laboratory, MPA-CMMS, Los Alamos National Laboratory, Los Alamos, USA, MPA-CMMS, Los Alamos National Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico, USA, Los Alamos National Labs
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Dirk Honecker
Institut Laue-Langevin
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Lisa DeBeer-Schmitt
Neutron Science Directorate, Oak Ridge National Laboratory, Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge National Laboratory
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Jonathan S White
Paul Scherrer Institute