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Tailoring the hybrid anomalous Hall response in engineered magnetic topological insulator heterostructures
DOI:
10.1021/acs.nanolett.9b04932
Authors:
Peng
Chen
(ShanghaiTech University)
,
Yong
Zhang
(ShanghaiTech University)
,
Qi
Yao
(ShanghaiTech University)
,
Fugu
Tian
(ShanghaiTech University)
,
Lun
Li
(ShanghaiTech University)
,
Zhengkun
Qi
(ShanghaiTech University)
,
Xiaoyang
Liu
(ShanghaiTech University)
,
Liyang
Liao
(Tsinghua University)
,
Cheng
Song
(Tsinghua University)
,
Jingyuan
Wang
(University of California, Irvine)
,
Jing
Xia
(University of California, Irvine)
,
Gang
Li
(ShanghaiTech University)
,
David M.
Burn
(Diamond Light Source)
,
Gerrit
Van Der Laan
(Diamond Light Source)
,
Thorsten
Hesjedal
(University of Oxford)
,
Shilei
Zhang
(ShanghaiTech University)
,
Xufeng
Kou
(ShanghaiTech University)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Nano Letters
State:
Published (Approved)
Published:
February 2020
Diamond Proposal Number(s):
21875
,
23895
Abstract: Engineering the anomalous Hall effect (AHE) is the key to manipulate the magnetic orders in the emerging magnetic topological insulators (MTIs). In this letter, we synthesize the epitaxial Bi2Te3/MnTe magnetic heterostructures and observe pronounced AHE signals from both layers combined together. The evolution of the resulting hybrid AHE intensity with the top Bi2Te3 layer thickness manifests the presence of an intrinsic ferromagnetic phase induced by the topological surface states at the heterolayer interface. More importantly, by doping the Bi2Te3 layer with Sb, we are able to manipulate the sign of the Berry phase-associated AHE component. Our results demonstrate the unparalleled advantages of MTI heterostructures over magnetically doped TI counterparts in which the tunability of the AHE response can be greatly enhanced. This in turn unveils a new avenue for MTI heterostructure-based multifunctional applications.
Journal Keywords: magnetic topological insulators; anomalous Hall effect; heterostructure engineering; molecular beam epitaxy; Berry curvature
Subject Areas:
Materials,
Physics
Instruments:
I10-Beamline for Advanced Dichroism