Zhang, Steven S-L
Jiang, J S
Field, Stuart B
Heinonen, Olle G
AffiliationUniv Arizona, Dept Phys
MetadataShow full item record
PublisherAMER ASSOC ADVANCEMENT SCIENCE
CitationP. Li, J. Kally, S. S.-L. Zhang, T. Pillsbury, J. Ding, G. Csaba, J. Ding, J. S. Jiang, Y. Liu, R. Sinclair, C. Bi, A. DeMann, G. Rimal, W. Zhang, S. B. Field, J. Tang, W. Wang, O. G. Heinonen, V. Novosad, A. Hoffmann, N. Samarth, M. Wu, Magnetization switching using topological surface states. Sci. Adv. 5, eaaw3415 (2019).
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AbstractTopological surface states (TSSs) in a topological insulator are expected to be able to produce a spin-orbit torque that can switch a neighboring ferromagnet. This effect may be absent if the ferromagnet is conductive because it can completely suppress the TSSs, but it should be present if the ferromagnet is insulating. This study reports TSS-induced switching in a bilayer consisting of a topological insulator Bi2Se3 and an insulating ferromagnet BaFe12O19. A charge current in Bi2Se3 can switch the magnetization in BaFe12O19 up and down. When the magnetization is switched by a field, a current in Bi2Se3 can reduce the switching field by ~4000 Oe. The switching efficiency at 3 K is 300 times higher than at room temperature; it is ~30 times higher than in Pt/BaFe12O19. These strong effects originate from the presence of more pronounced TSSs at low temperatures due to enhanced surface conductivity and reduced bulk conductivity.
NoteOpen access journal
VersionFinal published version
SponsorsU.S. National Science FoundationNational Science Foundation (NSF) [DMR-1710512, EFMA-1641989]; U.S. Department of Energy, Office of Science, Basic Energy SciencesUnited States Department of Energy (DOE) [DE-SC0018994]; Pennsylvania State Two-Dimensional Crystal Consortium-Materials Innovation Platform (2DCC-MIP) under the U.S. National Science Foundation [DMR-1539916]; U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Science and Engineering DivisionUnited States Department of Energy (DOE); NSFNational Science Foundation (NSF) [ECCS-1554011]