Above 400-K robust perpendicular ferromagnetic phase in a topological insulator

Tang, Chi; Chang, Cui -Zu; Zhao, Gejian; Liu, Yawen; Jiang, Zilong; Liu, Chao -Xing; McCartney, Martha R.; Smith, David J.; Chen, Tingyong; Moodera, Jagadeesh S.; Shi, Jing

doi:10.1126/sciadv.1700307

Title: Above 400-K robust perpendicular ferromagnetic phase in a topological insulator

Journal Article · Fri Jun 23 00:00:00 EDT 2017 · Science Advances

DOI:https://doi.org/10.1126/sciadv.1700307· OSTI ID:1389003

Tang, Chi ^[1]; Chang, Cui -Zu ^[2]; Zhao, Gejian ^[3]; Liu, Yawen ^[1]; Jiang, Zilong ^[1]; Liu, Chao -Xing ^[4]; McCartney, Martha R. ^[3]; Smith, David J. ^[3];

^[3]; Moodera, Jagadeesh S. ^[5]; Shi, Jing ^[1]

Univ. of California, Riverside, CA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Pennsylvania State Univ., University Park, PA (United States)
Arizona State Univ., Tempe, AZ (United States)
Pennsylvania State Univ., University Park, PA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Here, 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 (T_c) and inherent spin disorder associated with the random magnetic dopants. We demonstrate drastically enhanced T_c by exchange coupling TIs to Tm₃Fe₅O₁₂, a high-T_c 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 T_c, absence of spin disorder, and perpendicular anisotropy are all essential to the occurrence of the QAHE at high temperatures.

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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)

Grant/Contract Number:: SC0012670

OSTI ID:: 1389003

Journal Information:: Science Advances, Vol. 3, Issue 6; 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 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 114 works

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SUPERCONDUCTIVITY AND SUPERFLUIDITY
phonons
thermal conductivity
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spin dynamics
spintronics

Title: Above 400-K robust perpendicular ferromagnetic phase in a topological insulator

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