Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session M47: Dynamics of Skyrmions and Chiral Magnetic Textures
11:15 AM–2:03 PM,
Wednesday, March 4, 2020
Sponsoring Units: GMAG DMP
Chair: Sonny H. Rhim, Univ of Ulsan
Abstract: M47.00006 : Skyrmions Diffusion enabling stochastic computing*
We have studied low skyrmion pinning materials where we can stabilize skyrmions and controllably nucleate and displace them by current pulses due to spin-orbit torques . We find topologically non-trivial N=1 skyrmions that move in the direction of the current pulses . At zero applied current, we find thermally activated skyrmion motion. We track the trajectories of skyrmions and from the dependence of their mean-square-displacement (MSD) on time, we can identify motion by diffusion and obtain the diffusion constant . There is a strong dependence of the skyrmion diffusion parameter on temperature and the skyrmion size. Finally we patterning the reshuffler geometry and ascertain its performance.
Beyond ferromagnetic skyrmions, we are evaluating the efficiency of skyrmion spin structures in antiferromagnets, which have major advantages. In addition to the absence of a skyrmion Hall effect , also antiskyrmions can be stabilized for which first indications have been found.
 D. Pinna et al., Phys. Rev. Appl. 9, 064018 (2018)
 J. Zazvorka et al., Nature Nano. 14, 658 (2019)
 K. Litzius et al. Nature Phys. 13, 170 (2017)
 J. Barker et al., Phys. Rev. Lett. 116, 147203 (2016)
*We thank in particular the ERC, the German Research Foundation and the IEEE Magnetics Society Distinguished Lecturer Program.
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