Understanding the Giant Enhancement of Exchange Interaction in Bi2Se3-EuS Heterostructures

Understanding the Giant Enhancement of Exchange Interaction in Bi2Se3-EuS Heterostructures A recent experiment indicated that a ferromagnetic EuS film in contact with a topological insulator Bi2Se3 might show a largely enhanced Curie temperature and perpendicular magnetic anisotropy [F. Katmis , Nature (London) 533, 513 (2016).NATUAS0028-083610.1038/nature17635]. Through systematic density functional calculations, we demonstrate that in addition to the factor that Bi2Se3 has a strong spin orbit coupling, the topological surface states are crucial to make these unusual behaviors robust as they hybridize with EuS states and extend rather far into the magnetic layers. The magnetic moments of Eu atoms are nevertheless not much enhanced, unlike what was reported in the experiment. Our results and model analyses provide useful insights for how these quantities are linked, and pave a way for the control of properties of magnetic films via contact with topological insulators. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review Letters American Physical Society (APS)

Understanding the Giant Enhancement of Exchange Interaction in Bi2Se3-EuS Heterostructures

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Understanding the Giant Enhancement of Exchange Interaction in Bi2Se3-EuS Heterostructures

Abstract

A recent experiment indicated that a ferromagnetic EuS film in contact with a topological insulator Bi2Se3 might show a largely enhanced Curie temperature and perpendicular magnetic anisotropy [F. Katmis , Nature (London) 533, 513 (2016).NATUAS0028-083610.1038/nature17635]. Through systematic density functional calculations, we demonstrate that in addition to the factor that Bi2Se3 has a strong spin orbit coupling, the topological surface states are crucial to make these unusual behaviors robust as they hybridize with EuS states and extend rather far into the magnetic layers. The magnetic moments of Eu atoms are nevertheless not much enhanced, unlike what was reported in the experiment. Our results and model analyses provide useful insights for how these quantities are linked, and pave a way for the control of properties of magnetic films via contact with topological insulators.
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Publisher
The American Physical Society
Copyright
Copyright © © 2017 American Physical Society
ISSN
0031-9007
eISSN
1079-7114
D.O.I.
10.1103/PhysRevLett.119.027201
Publisher site
See Article on Publisher Site

Abstract

A recent experiment indicated that a ferromagnetic EuS film in contact with a topological insulator Bi2Se3 might show a largely enhanced Curie temperature and perpendicular magnetic anisotropy [F. Katmis , Nature (London) 533, 513 (2016).NATUAS0028-083610.1038/nature17635]. Through systematic density functional calculations, we demonstrate that in addition to the factor that Bi2Se3 has a strong spin orbit coupling, the topological surface states are crucial to make these unusual behaviors robust as they hybridize with EuS states and extend rather far into the magnetic layers. The magnetic moments of Eu atoms are nevertheless not much enhanced, unlike what was reported in the experiment. Our results and model analyses provide useful insights for how these quantities are linked, and pave a way for the control of properties of magnetic films via contact with topological insulators.

Journal

Physical Review LettersAmerican Physical Society (APS)

Published: Jul 14, 2017

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