期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 11, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202008411
关键词
ferromagnetic resonance; magnetic damping; spin pumping; topological Dirac semimetals; topological quantum materials; topological surface states
类别
资金
- U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0018994]
- U.S. National Science Foundation [DMR-1710512, EFMA-1641989, ECCS-1915849]
- National Natural Science Foundation of China [11734006, 11974165]
- U.S. Department of Energy (DOE) [DE-SC0018994] Funding Source: U.S. Department of Energy (DOE)
The study found that an Ag spacer between the alpha-Sn film and NiFe film can enhance the damping of the NiFe film, potentially related to the topologically nontrivial surface states of the alpha-Sn film. These results suggest that the topological Dirac semimetal alpha-Sn may have promising applications in spintronics.
This article reports damping enhancement in a ferromagnetic NiFe thin film due to an adjacent alpha-Sn thin film. Ferromagnetic resonance studies show that an alpha-Sn film separated from a NiFe film by an ultrathin Ag spacer can cause an extra damping in the NiFe film that is three times bigger than the intrinsic damping of the NiFe film. Such an extra damping is absent in structures where the alpha-Sn film interfaces directly with a NiFe film, or is replaced by a beta-Sn film. The data suggest that the extra damping is associated with topologically nontrivial surface states in the topological Dirac semimetal phase of the alpha-Sn film. This work suggests that, like topological insulators, topological Dirac semimetal alpha-Sn may have promising applications in spintronics.
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