Temperature dependence of spin - orbit torque-driven magnetization switching in in situ grown Bi2Te3/MnTe heterostructures

Xiaoyang Liu, Di Wu, Liyang Liao, Peng Chen, Yong Zhang, Fenghua Xue, Qi Yao, Cheng Song, Kang L. Wang, Xufeng Kou

Research output: Contribution to journalArticlepeer-review

Abstract

We report the temperature dependence of the spin-orbit torque (SOT) in the in situ grown Bi2Te3/MnTe heterostructures by molecular beam epitaxy. By appropriately designing the film stack, robust ferromagnetic order with high Curie temperature and strong perpendicular magnetic anisotropy is established in the MnTe layer. Meanwhile, the sharp hetero-interface warrants highly efficient spin current injection from the conductive topological insulator (TI) channel. Accordingly, SOT-driven magnetization switching is observed up to 90 K with the critical current density within the 106 Acm-2 range. More importantly, the temperature-dependent harmonic measurement data can be divided into two categories, namely, the spin Hall effect of the TI bulk states gives rise to a relatively small spin Hall angle in the high-temperature region, whereas the spin-momentum locking nature of the interfacial Dirac fermions leads to the enhancement of the SOT strength once the topological surface states become the dominant conduction channel at deep cryogenic temperatures. Our results offer direct evidence of the underlying mechanism that determines the SOT efficiency and may set up a suitable platform to realize TI-based spin-orbit applications toward room temperature.

Original languageEnglish
Article number1124061
JournalApplied Physics Letters
Volume118
Issue number11
DOIs
Publication statusPublished - 2021 Mar 15

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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