期刊
SCIENCE ADVANCES
卷 4, 期 6, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aas8660
关键词
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资金
- Spins and Heat in Nanoscale Electronic Systems, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences [SC0012670]
- National Basic Research Programs of China (973 grants) [2014CB920902, 2015CB921104]
- National Natural Science Foundation of China [11574006]
- NSF [DMR-1207469, 1700137]
- Office of Naval Research [N00014-13-1-0301, N00014-16-1-2657]
- STC (Science and Technology Center) Center for Integrated Quantum Materials under NSF grant [DMR-1231319]
- Exploratory Research for Advanced Technology-Japan Science and Technology Agency [JPMJER1402]
- Ministry of Education, Culture, Sports, Science and Technology, Japan [26103006, JP15K05153, JP16H04023, JP17H02927]
This work demonstrates markedly modified spin dynamics of magnetic insulator (MI) by the spin momentum-locked Dirac surface states of the adjacent topological insulator (TI), which can be harnessed for spintronic applications. As the Bi concentration xis systematically tuned in 5-nm-thick (BixSb1-x)(2)Te-3 TI films, the weight of the surface relative to bulk states peaks at x = 0.32 when the chemical potential approaches the Dirac point. At this concentration, the Gilbert damping constant of the precessing magnetization in 10-nm-thick Y3Fe5O12 MI films in the MI/TI heterostructures is enhanced by an order of magnitude, the largest among all concentrations. In addition, the MI acquires additional strong magnetic anisotropy that favors the in-plane orientation with similar Bi concentration dependence. These extraordinary effects of the Dirac surface states distinguish TI from other materials such as heavy metals in modulating spin dynamics of the neighboring magnetic layer.
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