Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session W54: Topological Devices and Nanostructures
8:00 AM–10:00 AM,
Friday, March 6, 2020
Room: Mile High Ballroom 2A
Sponsoring Unit: DCMP
Chair: Jose Rodriguez, University of California, Los Angeles
Abstract: W54.00005 : Current-driven dynamics of spin textures on a surface of topological insulators*
In this talk, we present analytical expressions of the spin-transfer torques on a surface of the magnetic topological insulator by including the higher-order contributions of momentum, k2-term and the hexagonal warping. We obtain six different types of the spin-transfer torque including both the field-like and the damping-like torques; the four of them appear only when the higher-order momentum contributions are included. In addition, we discuss the dynamics of magnetic skyrmions driven by the spin-transfer torques on the surface of the topological insulator. Unlike the skyrmion dynamics in conventional metals, we find that the dynamics significantly depends on the internal structure of magnetic textures.
*This work was supported by the RIKEN Special Postdoctoral Researcher Program, JST CREST Grant Number JPMJCR1874 and JP- MJCR16F1, and JSPS KAKENHI Grant Numbers 18H03676 and 26103006.
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