Magnetization switching using topological surface states

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Author
Li, Peng
Kally, James
Zhang, Steven S-L
Pillsbury, Timothy
Ding, Jinjun
Csaba, Gyorgy
Ding, Junjia
Jiang, J S
Liu, Yunzhi
Sinclair, Robert
Affiliation
Univ Arizona, Dept Phys
Issue Date
2019-08-30

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Publisher
AMER ASSOC ADVANCEMENT SCIENCE
Citation
P. 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).
Journal
SCIENCE ADVANCES
Rights
Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).
Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
Abstract
Topological 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.
Note
Open access journal
ISSN
2375-2548
PubMed ID
31497642
DOI
10.1126/sciadv.aaw3415
Version
Final published version
Sponsors
U.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]
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