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MA: Fachverband Magnetismus
MA 7: Skyrmions I (joint session MA/KFM)
MA 7.3: Vortrag
Mittwoch, 29. September 2021, 10:45–11:00, H5
Real-space observation of skyrmion dynamics in an insulating magnet with a small heat gradient — Xiuzhen Yu1, Fumitaka Kagawa1,2, Shinichiro Seki2, Masashi Kubota1, •Jan Masell1, Fehmi S. Yasin1, Kiyomi Nakajima1, Masao Nakamura1, Masashi Kawasaki1,2, Naoto Nagaosa1,2, and Yoshinori Tokura1,2 — 1RIKEN CEMS, Wako, Japan — 2University of Tokyo, Tokyo, Japan
Magnetic skyrmions are whirls in the magnetization with a non-trivial real-space topology. They are frequently discussed as potential building blocks for future information technology devices due to their topological protection and high mobility: Skyrmions can be moved by electrical currents and magnetic field gradients. It was also proposed to move skyrmions by magnons or thermal gradients [1].
We report the first observation of skyrmion dynamics in a linear thermal gradient. While nanometer-sized skyrmions remain pinned even with large thermal gradients [2], we observe a depinning threshold on the order of only 10 K/m in the insulating chiral magnet Cu2OSeO3 where skyrmions are 60nm large and the Gilbert damping is low. The observed velocity on the scale of 1µm/s agrees with our estimates for skyrmion motion due to a thermally activated magnon current.
[1] L. Kong & J. Zang, PRL 111, 067203 (2013)
[2] M. Hirschberger, J. Masell, et al., PRL 125, 076602 (2020)
[3] X.Z. Yu, J. Masell, et al., preprint:
https://doi.org/10.21203/rs.3.rs-156692/v1