Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session W54: Transport and Dynamics of Skyrmions
3:00 PM–6:00 PM,
Thursday, March 17, 2022
Room: McCormick Place W-476
Sponsoring
Unit:
GMAG
Chair: Gang Qiu, UCLA
Abstract: W54.00011 : Emergence of spin-orbit coupled ferromagnetic surface state derived from Zak phase in a nonmagnetic insulator FeSi
5:24 PM–6:00 PM
Presenter:
Naoya Kanazawa
(Department of Applied Physics, University of Tokyo)
Author:
Naoya Kanazawa
(Department of Applied Physics, University of Tokyo)
In this study, we demonstrate a novel surface state hosting metallic conduction and ferromagnetic order in FeSi with insulating and nonmagnetic bulk state. We identify that the surface state is not categorized into the class of topological insulators but can be described by the central concept in modern theory of polarization, i.e., Zak phase. Owing to the unique dipolar charge distribution of Zak-phase origin, the surface state produces the strong SOC properties despite the absence of heavy-metal elements. By taking advantage of the emergent SOC, we also realize spintronic functionalities related to current-induced spin-dynamics. (e.g., magnetization switching). Our results shed light on compounds made of common elements and demonstrate another route for SOC-based spin manipulation [1].
[1] Y. Ohtsuka, N. Kanazawa et al., Science Advances in press.
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