Current-Nonlinear Hall Effect and Spin-Orbit Torque Magnetization Switching in a Magnetic Topological Insulator

K. Yasuda, A. Tsukazaki, R. Yoshimi, K. Kondou, K. S. Takahashi, Y. Otani, M. Kawasaki, and Y. Tokura
Phys. Rev. Lett. 119, 137204 – Published 28 September 2017
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Abstract

The current-nonlinear Hall effect or second harmonic Hall voltage is widely used as one of the methods for estimating charge-spin conversion efficiency, which is attributed to the magnetization oscillation by spin-orbit torque (SOT). Here, we argue the second harmonic Hall voltage under a large in-plane magnetic field with an in-plane magnetization configuration in magnetic-nonmagnetic topological insulator (TI) heterostructures, Crx(Bi1ySby)2xTe3/(Bi1ySby)2Te3, where it is clearly shown that the large second harmonic voltage is governed not by SOT but mainly by asymmetric magnon scattering without macroscopic magnetization oscillation. Thus, this method does not allow an accurate estimation of charge-spin conversion efficiency in TI. Instead, the SOT contribution is exemplified by current pulse induced nonvolatile magnetization switching, which is realized with a current density of 2.5×1010Am2, showing its potential as a spintronic material.

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  • Received 25 March 2017

DOI:https://doi.org/10.1103/PhysRevLett.119.137204

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

K. Yasuda1,*, A. Tsukazaki2, R. Yoshimi3, K. Kondou3, K. S. Takahashi3,4, Y. Otani3,5, M. Kawasaki1,3, and Y. Tokura1,3

  • 1Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan
  • 2Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
  • 3RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
  • 4PRESTO, Japan Science and Technology Agency (JST), Chiyoda-ku, Tokyo, 102-0075, Japan
  • 5Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa 277-8581, Japan

  • *yasuda@cmr.t.u-tokyo.ac.jp

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Issue

Vol. 119, Iss. 13 — 29 September 2017

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