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Title: Magnetization switching using topological surface states

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.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [2];  [1]; ORCiD logo [4];  [3];  [3]; ORCiD logo [5];  [5];  [6]; ORCiD logo [1]; ORCiD logo [7];  [8]; ORCiD logo [1];  [9];  [6];  [3];  [3];  [3] more »; ORCiD logo [2]; ORCiD logo [1] « less
+ Show Author Affiliations
  1. Colorado State Univ., Fort Collins, CO (United States)
  2. Pennsylvania State Univ., University Park, PA (United States)
  3. Argonne National Lab. (ANL), Lemont, IL (United States)
  4. Pazmany Peter Catholic Univ., Budapest (Hungary)
  5. Stanford Univ., Stanford, CA (United States)
  6. Univ. of Arizona, Tucson, AZ (United States)
  7. Univ. of Wyoming, Laramie, WY (United States); Rutgers Univ., Piscataway, NJ (United States)
  8. Oakland Univ., Rochester, MI (United States)
  9. Univ. of Wyoming, Laramie, WY (United States)
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
OSTI Identifier:
1573252
Alternate Identifier(s):
OSTI ID: 1755874
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 5; Journal Issue: 8; Journal ID: ISSN 2375-2548
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Li, Peng, Kally, James, Zhang, Steven S. -L., Pillsbury, Timothy, Ding, Jinjun, Csaba, Gyorgy, Ding, Junjia, Jiang, J. S., Liu, Yunzhi, Sinclair, Robert, Bi, Chong, DeMann, August, Rimal, Gaurab, Zhang, Wei, Field, Stuart B., Tang, Jinke, Wang, Weigang, Heinonen, Olle G., Novosad, Valentine, Hoffmann, Axel, Samarth, Nitin, and Wu, Mingzhong. Magnetization switching using topological surface states. United States: N. p., 2019. Web. doi:10.1126/sciadv.aaw3415.
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Li, Peng, Kally, James, Zhang, Steven S. -L., Pillsbury, Timothy, Ding, Jinjun, Csaba, Gyorgy, Ding, Junjia, Jiang, J. S., Liu, Yunzhi, Sinclair, Robert, Bi, Chong, DeMann, August, Rimal, Gaurab, Zhang, Wei, Field, Stuart B., Tang, Jinke, Wang, Weigang, Heinonen, Olle G., Novosad, Valentine, Hoffmann, Axel, Samarth, Nitin, & Wu, Mingzhong. Magnetization switching using topological surface states. United States. https://doi.org/10.1126/sciadv.aaw3415
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Li, Peng, Kally, James, Zhang, Steven S. -L., Pillsbury, Timothy, Ding, Jinjun, Csaba, Gyorgy, Ding, Junjia, Jiang, J. S., Liu, Yunzhi, Sinclair, Robert, Bi, Chong, DeMann, August, Rimal, Gaurab, Zhang, Wei, Field, Stuart B., Tang, Jinke, Wang, Weigang, Heinonen, Olle G., Novosad, Valentine, Hoffmann, Axel, Samarth, Nitin, and Wu, Mingzhong. Fri . "Magnetization switching using topological surface states". United States. https://doi.org/10.1126/sciadv.aaw3415. https://www.osti.gov/servlets/purl/1573252.
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@article{osti_1573252,
title = {Magnetization switching using topological surface states},
author = {Li, Peng and Kally, James and Zhang, Steven S. -L. and Pillsbury, Timothy and Ding, Jinjun and Csaba, Gyorgy and Ding, Junjia and Jiang, J. S. and Liu, Yunzhi and Sinclair, Robert and Bi, Chong and DeMann, August and Rimal, Gaurab and Zhang, Wei and Field, Stuart B. and Tang, Jinke and Wang, Weigang and Heinonen, Olle G. and Novosad, Valentine and Hoffmann, Axel and Samarth, Nitin and Wu, Mingzhong},
abstractNote = {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.},
doi = {10.1126/sciadv.aaw3415},
journal = {Science Advances},
number = 8,
volume = 5,
place = {United States},
year = {Fri Aug 30 00:00:00 EDT 2019},
month = {Fri Aug 30 00:00:00 EDT 2019}
}
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https://doi.org/10.1126/sciadv.aaw3415
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