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

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

doi:10.1063/1.5083931

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

Journal Article · Thu Feb 28 00:00:00 EST 2019 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.5083931· OSTI ID:1566660

Yang, Chao-Yao ^[1]; Lee, Yen-Hsun ^[1]; Ou Yang, Kui-Hon ^[1]; Chiu, Kuan-Chia ^[1]; Tang, Chi ^[2]; Liu, Yawen ^[2]; Zhao, Yi-Fan ^[3]; Chang, Cui-Zu ^[3]; Chang, Fan-Hsiu ^[4]; Lin, Hong-Ji ^[4];

^[2]; Lin, Minn-Tsong ^[5]

National Taiwan Univ., Taipei (Taiwan)
Univ. of California, Riverside, CA (United States)
Pennsylvania State Univ., University Park, PA (United States)
National Synchrotron Radiation Research Center, Hsinchu (Taiwan)
National Taiwan Univ., Taipei (Taiwan); Academia Sinica, Taipei (Taiwan)

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, (Bi_0.25Sb_0.75)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.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES); Univ. of California, Riverside, CA (United States)

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

Grant/Contract Number:: SC0012670

OSTI ID:: 1566660

Journal Information:: Applied Physics Letters, Vol. 114, Issue 8; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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