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

Abstract

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.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1389029
DOE Contract Number:  
SC0012670
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 119; Journal 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
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; phonons; thermal conductivity; thermoelectric; spin dynamics; spintronics

Citation Formats

Kim, Jeongwoo, Kim, Kyoung-Whan, Wang, Hui, Sinova, Jairo, and Wu, Ruqian. Understanding the Giant Enhancement of Exchange Interaction in Bi2Se3-EuS Heterostructures. United States: N. p., 2017. Web. doi:10.1103/PhysRevLett.119.027201.
Kim, Jeongwoo, Kim, Kyoung-Whan, Wang, Hui, Sinova, Jairo, & Wu, Ruqian. Understanding the Giant Enhancement of Exchange Interaction in Bi2Se3-EuS Heterostructures. United States. doi:10.1103/PhysRevLett.119.027201.
Kim, Jeongwoo, Kim, Kyoung-Whan, Wang, Hui, Sinova, Jairo, and Wu, Ruqian. Sat . "Understanding the Giant Enhancement of Exchange Interaction in Bi2Se3-EuS Heterostructures". United States. doi:10.1103/PhysRevLett.119.027201.
@article{osti_1389029,
title = {Understanding the Giant Enhancement of Exchange Interaction in Bi2Se3-EuS Heterostructures},
author = {Kim, Jeongwoo and Kim, Kyoung-Whan and Wang, Hui and Sinova, Jairo and Wu, Ruqian},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.119.027201},
journal = {Physical Review Letters},
number = 2,
volume = 119,
place = {United States},
year = {Sat Jul 01 00:00:00 EDT 2017},
month = {Sat Jul 01 00:00:00 EDT 2017}
}