In-plane spin-orbit torque magnetization switching and its detection using the spin rectification effect at subgigahertz frequencies

Motomi Aoki, Ei Shigematsu, Masayuki Matsushima, Ryo Ohshima, Syuta Honda, Teruya Shinjo, Masashi Shiraishi, and Yuichiro Ando
Phys. Rev. B 102, 174442 – Published 30 November 2020
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Abstract

In-plane magnetization reversal of a permalloy/platinum bilayer was detected using the spin rectification effect. Using a subgigahertz microwave frequency to excite spin-torque ferromagnetic resonance (ST-FMR) in the bilayer induces two discrete DC voltages around an external static magnetic field of 0 mT. These discrete voltages depend on the magnetization directions of the permalloy and enable detection of the in-plane magnetization reversal. The threshold current density for the magnetization reversal is around 1020MA/cm2, the same order as for known spin-orbit torque switching with in-plane magnetization materials. The magnitude of the signal is the same or larger than that of the typical ST-FMR signal; that is, detection of magnetization switching is highly sensitive in spite of deviation from the optimal ST-FMR condition. The proposed method is applicable to a simple device structure even for a small ferromagnetic electrode with a width of 100 nm.

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  • Received 29 August 2020
  • Revised 5 November 2020
  • Accepted 5 November 2020

DOI:https://doi.org/10.1103/PhysRevB.102.174442

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Motomi Aoki1, Ei Shigematsu1, Masayuki Matsushima1, Ryo Ohshima1, Syuta Honda2, Teruya Shinjo1, Masashi Shiraishi1, and Yuichiro Ando1,*

  • 1Department of Electronic Science and Engineering, Kyoto University, Kyoto, Kyoto 615-8510, Japan
  • 2Department of Pure and Applied Physics, Kansai University, Suita, Osaka 564-8680, Japan

  • *ando@kuee.kyoto-u.ac.jp

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Issue

Vol. 102, Iss. 17 — 1 November 2020

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