Fluctuation-induced Néel and Bloch skyrmions at topological insulator surfaces
Name
PhysRevB.98.060401.pdf
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320.58 KB
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Checksum (MD5)
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Author(s)
Nogueira, Flavio S.
Eremin, Ilya
van den Brink, Jeroen
Kravchuk, Volodymyr P.
Moodera, Jagadeesh
Katmis, Ferhat
Date Issued
August 2018
Journal
Physical Review B
Publisher
American Physical Society
Citation
Nogueira, Flavio S. et al. "Fluctuation-induced Néel and Bloch skyrmions at topological insulator surfaces." Physical Review B 98, 6 (August 2018): 060401(R) © 2018 American Physical Society
Version
Final published version
Abstract
Ferromagnets in contact with a topological insulator have become appealing candidates for spintronics due to the presence of Dirac surface states with spin-momentum locking. Because of this, bilayer Bi₂Se₃-EuS structures, for instance, show a finite magnetization at the interface at temperatures well exceeding the Curie temperature of bulk EuS. Here, we determine theoretically the effective magnetic interactions at a topological insulator-ferromagnet interface above the magnetic ordering temperature. We show that by integrating out the Dirac fermion fluctuations an effective Dzyaloshinskii-Moriya interaction and magnetic charging interaction emerge. As a result, individual magnetic skyrmions and extended skyrmion lattices can form at the interfaces of ferromagnets and topological insulators, the first indications of which have been very recently observed experimentally.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology)
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.98.060401
