Fluctuation-induced Neel and Bloch skyrmions at topological insulator surfaces

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2018-08-03
Nogueira, Flavio S.
Eremin, Ilya
Katmis, Ferhat
Moodera, Jagadeesh S.
van den Brink, Jeroen
Kravchuk, Volodymyr P.
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 themagnetic 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.
PHYSICAL REVIEW B

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Citation Formats
F. S. Nogueira, I. Eremin, F. Katmis, J. S. Moodera, J. van den Brink, and V. P. Kravchuk, “Fluctuation-induced Neel and Bloch skyrmions at topological insulator surfaces,” PHYSICAL REVIEW B, pp. 0–0, 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/68363.