Spin-Orbit Torque Switching of a Nearly Compensated Ferrimagnet by Topological Surface States

Hao Wu, Yong Xu, Peng Deng, Quanjun Pan, Seyed Armin Razavi, Kin Wong, Li Huang, Bingqian Dai, Qiming Shao, Guoqiang Yu, Xiufeng Han, Juan Carlos Rojas-Sánchez, Stéphane Mangin, Kang L. Wang

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Utilizing spin-orbit torque (SOT) to switch a magnetic moment provides a promising route for low-power-dissipation spintronic devices. Here, the SOT switching of a nearly compensated ferrimagnet Gdx(FeCo)1− x by the topological insulator [Bi2Se3 and (BiSb)2Te3] is investigated at room temperature. The switching current density of (BiSb)2Te3 (1.20 × 105 A cm−2) is more than one order of magnitude smaller than that in conventional heavy-metal-based structures, which indicates the ultrahigh efficiency of charge-spin conversion (>1) in topological surface states. By tuning the net magnetic moment of Gdx(FeCo)1− x via changing the composition, the SOT efficiency has a significant enhancement (6.5 times) near the magnetic compensation point, and at the same time the switching speed can be as fast as several picoseconds. Combining the topological surface states and the nearly compensated ferrimagnets provides a promising route for practical energy-efficient and high-speed spintronic devices.

Original languageEnglish
Article number1901681
JournalAdvanced Materials
Volume31
Issue number35
DOIs
Publication statusPublished - 2019 Aug

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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