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

Kim, Jeongwoo; Kim, Kyoung-Whan; Wang, Hui; Sinova, Jairo; Wu, Ruqian

doi:10.1103/PhysRevLett.119.027201

Title: Understanding the Giant Enhancement of Exchange Interaction in ${Bi}_{2} {Se}_{3} - EuS$ Heterostructures

Journal Article · Sat Jul 01 00:00:00 EDT 2017 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.119.027201· OSTI ID:1389029

Kim, Jeongwoo; Kim, Kyoung-Whan; Wang, Hui; Sinova, Jairo; Wu, Ruqian

A recent experiment indicated that a ferromagnetic EuS film in contact with a topological insulator Bi 2 Se 3 might show a largely enhanced Curie temperature and perpendicular magnetic anisotropy [F. Katmis et al., Nature (London) 533, 513 (2016).]. Through systematic density functional calculations, we demonstrate that in addition to the factor that Bi 2 Se 3 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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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

DOE Contract Number:: SC0012670

OSTI ID:: 1389029

Journal Information:: Physical Review Letters, Vol. 119, Issue 2; Related Information: SHINES partners with University of California, Riverside (lead); Arizona State University; Colorado State University; Johns Hopkins University; University of California Irvine; University of California Los Angeles; University of Texas at Austin; ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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Title: Understanding the Giant Enhancement of Exchange Interaction in ${Bi}_{2} {Se}_{3} - EuS$ Heterostructures