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Title: Direct observation of proximity-induced magnetism and spin reorientation in topological insulator on a ferrimagnetic oxide

Abstract

The quantum anomalous Hall effect (QAHE) in a magnetic topological insulator system without the need of an external magnetic field becomes of great interest because of its dissipationless spin currents. The proximity effect via a magnetic adlayer is a promising strategy to bring magnetism into a topological insulator (TI) due to its boosted Curie temperature for a realistic application. In this work, a proximity-induced magnetism above 90 K in a TI, (Bi0.25Sb0.75)2Te3, on a ferrimagnetic adlayer with perpendicular magnetic anisotropy, thulium-iron-garnet (TIG), was evidenced directly by using magnetic circular dichroism. A competition between exchange couplings with different sublattice-sites was further revealed element-specifically in a temperature-driven spin-reorientation of TI, bringing an issue on magnetic inhomogeneity at the interface, which might cause difficulties in obtaining QAHE in such a TI/TIG bilayer system. Our results prove directly the robust magnetism of TI above liquid nitrogen temperatures and also give a deep insight into the mechanism of interfacial coupling in the proximity effect for the bilayer of TI and magnetic oxide, which could be essential for the design of a system with QAHE.

Authors:
 [1];  [1];  [1];  [1];  [2];  [2];  [3];  [3];  [4];  [4]; ORCiD logo [2];  [5]
+ Show Author Affiliations
  1. National Taiwan Univ., Taipei (Taiwan)
  2. Univ. of California, Riverside, CA (United States)
  3. Pennsylvania State Univ., University Park, PA (United States)
  4. National Synchrotron Radiation Research Center, Hsinchu (Taiwan)
  5. National Taiwan Univ., Taipei (Taiwan); Academia Sinica, Taipei (Taiwan)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES); Univ. of California, Riverside, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1566660
Grant/Contract Number:  
SC0012670
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 114; Journal Issue: 8; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; phonons; thermal conductivity; thermoelectric; spin dynamics; spintronics

Citation Formats

Yang, Chao-Yao, Lee, Yen-Hsun, Ou Yang, Kui-Hon, Chiu, Kuan-Chia, Tang, Chi, Liu, Yawen, Zhao, Yi-Fan, Chang, Cui-Zu, Chang, Fan-Hsiu, Lin, Hong-Ji, Shi, Jing, and Lin, Minn-Tsong. Direct observation of proximity-induced magnetism and spin reorientation in topological insulator on a ferrimagnetic oxide. United States: N. p., 2019. Web. doi:10.1063/1.5083931.
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Yang, Chao-Yao, Lee, Yen-Hsun, Ou Yang, Kui-Hon, Chiu, Kuan-Chia, Tang, Chi, Liu, Yawen, Zhao, Yi-Fan, Chang, Cui-Zu, Chang, Fan-Hsiu, Lin, Hong-Ji, Shi, Jing, & Lin, Minn-Tsong. Direct observation of proximity-induced magnetism and spin reorientation in topological insulator on a ferrimagnetic oxide. United States. https://doi.org/10.1063/1.5083931
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Yang, Chao-Yao, Lee, Yen-Hsun, Ou Yang, Kui-Hon, Chiu, Kuan-Chia, Tang, Chi, Liu, Yawen, Zhao, Yi-Fan, Chang, Cui-Zu, Chang, Fan-Hsiu, Lin, Hong-Ji, Shi, Jing, and Lin, Minn-Tsong. Thu . "Direct observation of proximity-induced magnetism and spin reorientation in topological insulator on a ferrimagnetic oxide". United States. https://doi.org/10.1063/1.5083931. https://www.osti.gov/servlets/purl/1566660.
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@article{osti_1566660,
title = {Direct observation of proximity-induced magnetism and spin reorientation in topological insulator on a ferrimagnetic oxide},
author = {Yang, Chao-Yao and Lee, Yen-Hsun and Ou Yang, Kui-Hon and Chiu, Kuan-Chia and Tang, Chi and Liu, Yawen and Zhao, Yi-Fan and Chang, Cui-Zu and Chang, Fan-Hsiu and Lin, Hong-Ji and Shi, Jing and Lin, Minn-Tsong},
abstractNote = {The quantum anomalous Hall effect (QAHE) in a magnetic topological insulator system without the need of an external magnetic field becomes of great interest because of its dissipationless spin currents. The proximity effect via a magnetic adlayer is a promising strategy to bring magnetism into a topological insulator (TI) due to its boosted Curie temperature for a realistic application. In this work, a proximity-induced magnetism above 90 K in a TI, (Bi0.25Sb0.75)2Te3, on a ferrimagnetic adlayer with perpendicular magnetic anisotropy, thulium-iron-garnet (TIG), was evidenced directly by using magnetic circular dichroism. A competition between exchange couplings with different sublattice-sites was further revealed element-specifically in a temperature-driven spin-reorientation of TI, bringing an issue on magnetic inhomogeneity at the interface, which might cause difficulties in obtaining QAHE in such a TI/TIG bilayer system. Our results prove directly the robust magnetism of TI above liquid nitrogen temperatures and also give a deep insight into the mechanism of interfacial coupling in the proximity effect for the bilayer of TI and magnetic oxide, which could be essential for the design of a system with QAHE.},
doi = {10.1063/1.5083931},
journal = {Applied Physics Letters},
number = 8,
volume = 114,
place = {United States},
year = {Thu Feb 28 00:00:00 EST 2019},
month = {Thu Feb 28 00:00:00 EST 2019}
}
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https://doi.org/10.1063/1.5083931
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