期刊
PHYSICAL REVIEW LETTERS
卷 114, 期 25, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.257202
关键词
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资金
- National Research Foundation (NRF), Prime Minister's Office, Singapore, under its Competitive Research Programme (CRP Award) [NRFCRP12-2013-01]
- Ministry of Education-Singapore Academic Research Fund Tier 1 [R-263-000-A75-750]
- Ministry of Education-Singapore Academic Research Fund Tier 2 [R-263-000-B10-112]
- Office of Naval Research [N000141210456]
- Gordon and Betty Moore Foundation's EPiQS Initiative [GBMF4418]
The three dimensional topological insulator bismuth selenide (Bi2Se3) is expected to possess strong spin-orbit coupling and spin-textured topological surface states and, thus, exhibit a high charge to spin current conversion efficiency. We evaluate spin-orbit torques in Bi2Se3/Co40Fe40B20 devices at different temperatures by spin torque ferromagnetic resonance measurements. As the temperature decreases, the spin-orbit torque ratio increases from similar to 0.047 at 300 K to similar to 0.42 below 50 K. Moreover, we observe a significant out-of-plane torque at low temperatures. Detailed analysis indicates that the origin of the observed spin-orbit torques is topological surface states in Bi2Se3. Our results suggest that topological insulators with strong spin-orbit coupling could be promising candidates as highly efficient spin current sources for exploring the next generation of spintronic applications.
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