Allan Leishman
(Department of Physics, University of Notre Dame)
We report the observation of a topological skyrmion energy barrier through a hysteresis of the skyrmion lattice in the prototypical helimagnet MnSi. Measurements of the energy barrier were made using small-angle neutron scattering and a bespoke DC field coil to allow for high-precision hysteresis loops. Data has been analyzed using an adapted Preisach model to quantify the energy barrier for skyrmion formation and the magnetic behavior of the sample as a whole. This analysis was then compared with minimum-energy path analysis based on atomistic spin simulations to verify the topological nature of the barrier. This reveals that the skyrmion lattice in MnSi forms with an activation barrier of several eV and in domains that are several hundred skyrmions in size.
| Speakers Gender |
Male
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| Level of Expertise |
Student
|
| Do you wish to take part in the poster slam |
No
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Allan Leishman
(Department of Physics, University of Notre Dame)
Raí Menezes
(Department of Physics, University of Antwerp)
Grace Longbons
(Department of Physics, University of Notre Dame)
Dr
Eric Bauer
(Los Alamos National Laboratory)
Dr
Marc Janoschek
(Laboratory for Neutron and Muon Instrumentation, Paul Scherrer Institute)
Dr
Dirk Honecker
(Institut Laue-Langevin)
Dr
Lisa DeBeer-Schmitt
(Large Scale Structures Group, Neutron Sciences Directorate, Oak Ridge National Laboratory)
Dr
Jonathan White
(Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute)
Dr
Anna Sokolova
(Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organization)
Prof.
Milorad Milošević
(Department of Physics, University of Antwerp)
Prof.
Morten Eskildsen
(Department of Physics, University of Notre Dame)
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