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

Journal Article · · Advanced Materials
 [1];  [2];  [3];  [3];  [3];  [3];  [4];  [3];  [3];  [4];  [4];  [2];  [2];  [3]
  1. Univ. of California, Los Angeles, CA (United States); OSTI
  2. Univ. de Lorraine, Nancy (France)
  3. Univ. of California, Los Angeles, CA (United States)
  4. Chinese Academy of Sciences (CAS), Beijing (China)
+ Show Author Affiliations
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.
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:
National Key R&D Program of China; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012670
OSTI ID:
1767456
Alternate ID(s):
OSTI ID: 1532426
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Journal Issue: 35 Vol. 31; ISSN 0935-9648
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
current-induced magnetization switching
ferrimagnets
phonons
spin dynamics
spin-orbit torque
spintronics
thermal conductivity
thermoelectric
topological insulators