Spin-orbit torque from a ferromagnetic metal

Wu, Hao; Razavi, Seyed Armin; Shao, Qiming; Li, Xiang; Wong, Kin L.; Liu, Yuxiang; Yin, Gen; Wang, Kang L.

doi:10.1103/physrevb.99.184403

Title: Spin-orbit torque from a ferromagnetic metal

Journal Article · Mon May 06 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.99.184403· OSTI ID:1611919

Wu, Hao ^[1]; Razavi, Seyed Armin ^[1]; Shao, Qiming ^[1]; Li, Xiang ^[1]; Wong, Kin L. ^[1]; Liu, Yuxiang ^[1]; Yin, Gen ^[1]; Wang, Kang L. ^[1]

Univ. of California, Los Angeles, CA (United States)

The switching of magnetization by current-induced spin-orbit torque (SOT) has potential applications for energy-efficient spintronic devices. In the past, most conventional works have been focused on SOT in heavy metals. Here the SOT from a ferromagnetic metal is investigated, and two mechanisms of the field-free SOT induced magnetization switching are demonstrated to be from the interlayer exchange coupling and the tilted perpendicular magnetic anisotropy. We exclude the spin torque contribution from the anomalous Hall effect and the interfacial Rashba effect combined with spin precession. A spin Hall angle θ_SH = –0.022 of CoFeB is obtained by the current-induced hysteresis loop shift method, and the obtained θ_SH is comparable with heavy metals. This work demonstrates that a considerable SOT can come from a ferromagnetic metal, and indicates the unconventional origin of spin-orbit coupling.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES); Univ. of California, Riverside, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012670

OSTI ID:: 1611919

Alternate ID(s):: OSTI ID: 1510833

Journal Information:: Physical Review B, Vol. 99, Issue 18; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 44 works

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Title: Spin-orbit torque from a ferromagnetic metal

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