Strongly Surface State Carrier-Dependent Spin–Orbit Torque in Magnetic Topological Insulators

Xiaoyu Che, Quanjun Pan, Božo Vareskic, Jingyi Zou, Lei Pan, Peng Zhang, Gen Yin, Hao Wu, Qiming Shao, Peng Deng, Kang L. Wang

研究成果: Article同行評審

19 引文 斯高帕斯(Scopus)

摘要

The topological surface states (TSS) in topological insulators (TIs) can exert strong spin–orbit torque (SOT) on adjacent magnetization, offering great potential in implementing energy-efficient magnetic memory devices. However, there are large discrepancies among the reported spin Hall angle values in TIs, and its temperature dependence still remains elusive. Here, the spin Hall angle in a modulation-doped Cr-BixSb2− xTe3 (Cr-BST) film is quantitatively determined via both transport and optic approaches, where consistent results are obtained. A large spin Hall angle of ≈90 in the modulation-doped Cr-BST film is demonstrated at 2.5 K, and the spin Hall angle drastically decreases to 0.3–0.5 as the temperature increases. Moreover, by tuning the top TSS carrier concentration, a competition between the top and bottom TSS in contributing to SOT is observed. The above phenomena can account for the large discrepancies among the previously reported spin Hall angle values and reveal the unique role of TSS in generating SOT.

原文English
文章編號1907661
期刊Advanced Materials
32
發行號16
DOIs
出版狀態Published - 2020 4月 1

All Science Journal Classification (ASJC) codes

  • 材料科學(全部)
  • 材料力學
  • 機械工業

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