Above 400-K Robust Perpendicular Ferromagnetic Phase in a Topological Insulator

Overview

Journal Sci Adv

Specialties Biology
Science

Date 2017 Jul 11

PMID 28691097

Citations 12

Authors

Chi Tang

Cui-Zu Chang

Gejian Zhao

Yawen Liu

Zilong Jiang

Chao-Xing Liu

Martha R McCartney

David J Smith

Tingyong Chen

Jagadeesh S Moodera

Jing Shi

Affiliations

Soon will be listed here.

Abstract

The quantum anomalous Hall effect (QAHE) that emerges under broken time-reversal symmetry in topological insulators (TIs) exhibits many fascinating physical properties for potential applications in nanoelectronics and spintronics. However, in transition metal-doped TIs, the only experimentally demonstrated QAHE system to date, the QAHE is lost at practically relevant temperatures. This constraint is imposed by the relatively low Curie temperature () and inherent spin disorder associated with the random magnetic dopants. We demonstrate drastically enhanced by exchange coupling TIs to TmFeO, a high- magnetic insulator with perpendicular magnetic anisotropy. Signatures showing that the TI surface states acquire robust ferromagnetism are revealed by distinct squared anomalous Hall hysteresis loops at 400 K. Point-contact Andreev reflection spectroscopy confirms that the TI surface is spin-polarized. The greatly enhanced , absence of spin disorder, and perpendicular anisotropy are all essential to the occurrence of the QAHE at high temperatures.

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