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

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

doi:10.1002/adma.201901681

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

Journal Article · Mon Jul 08 00:00:00 EDT 2019 · Advanced Materials

DOI:https://doi.org/10.1002/adma.201901681· OSTI ID:1767456

Wu, Hao ^[1]; Xu, Yong ^[2]; Deng, Peng ^[1]; Pan, Quanjun ^[1]; Razavi, Seyed Armin ^[1]; Wong, Kin ^[1]; Huang, Li ^[3]; Dai, Bingqian ^[1]; Shao, Qiming ^[1]; Yu, Guoqiang ^[3]; Han, Xiufeng ^[3]; Rojas‐Sánchez, Juan‐Carlos ^[2]; Mangin, Stéphane ^[2];

^[1]

Univ. of California, Los Angeles, CA (United States)
Univ. de Lorraine, Nancy (France)
Chinese Academy of Sciences (CAS), Beijing (China)

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 Gd_x(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 Gd_x(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.

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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); National Science Foundation (NSF); National Key Research and Development Program of China

Grant/Contract Number:: SC0012670; 1611570; 2017YFA0206200; 11434014

OSTI ID:: 1767456

Alternate ID(s):: OSTI ID: 1532426

Journal Information:: Advanced Materials, Vol. 31, Issue 35; ISSN 0935-9648

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 74 works

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36 MATERIALS SCIENCE
phonons
thermal conductivity
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Title: Spin-Orbit Torque Switching of a Nearly Compensated Ferrimagnet by Topological Surface States

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