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Title: Unidirectional Magneto-Resistance in Modulation-Doped Magnetic Topological Insulators

Abstract

Nonlinear unidirectional spin Hall magnetoresistance (USMR) has been reported in heavy metal/ferromagnet bilayers, which could be employed as an effective method in detecting the magnetization orientation in spintronic devices with 2-terminal geometry. Recently, another unidirectional magnetoresistance (UMR) was reported in magnetic topological insulator (TI)-based heterostructures at cryogenic temperature, whose amplitude is orders of magnitude larger than the USMR measured in heavy metal-based magnetic heterostructures at room temperature. Here, we report the UMR effect in the modulation-doped magnetic TI structures. This UMR arises due to the interplay between the magnetic dopant’s magnetization and the current-induced surface spin polarization, when they are parallel or antiparallel to each other in the TI material. By varying the dopant’s position in the structure, we reveal that the UMR is mainly originating from the interaction between the magnetization and the surface spin-polarized carriers (not bulk carriers). Furthermore, from the magnetic field-, the angular rotation-, and the temperature-dependence, we highlight the correlation between the UMR effect and the magnetism in the structures. The large UMR versus current ratio in TI-based magnetic bilayers promises the easy readout in TI-based spintronic devices with 2-terminal geometry.

Authors:
 [1]; ORCiD logo [2];  [2]; ORCiD logo [2];  [2];  [2];  [2]; ORCiD logo [2]; ORCiD logo [3];  [4];  [4]; ORCiD logo [2]
  1. Univ. of California, Los Angeles, CA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Univ. of California, Los Angeles, CA (United States)
  3. Beihang Univ., Beijing (China)
  4. Univ. of Texas, Austin, TX (United States)
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:
1566552
Grant/Contract Number:  
SC0012670
Resource Type:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 19; Journal Issue: 2; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; phonons; thermal conductivity; thermoelectric; spin dynamics; spintronics

Citation Formats

Fan, Yabin, Shao, Qiming, Pan, Lei, Che, Xiaoyu, He, Qinglin, Yin, Gen, Zheng, Cheng, Yu, Guoqiang, Nie, Tianxiao, Masir, Massoud R., MacDonald, Allan H., and Wang, Kang L.. Unidirectional Magneto-Resistance in Modulation-Doped Magnetic Topological Insulators. United States: N. p., 2019. Web. doi:10.1021/acs.nanolett.8b03702.
Fan, Yabin, Shao, Qiming, Pan, Lei, Che, Xiaoyu, He, Qinglin, Yin, Gen, Zheng, Cheng, Yu, Guoqiang, Nie, Tianxiao, Masir, Massoud R., MacDonald, Allan H., & Wang, Kang L.. Unidirectional Magneto-Resistance in Modulation-Doped Magnetic Topological Insulators. United States. https://doi.org/10.1021/acs.nanolett.8b03702
Fan, Yabin, Shao, Qiming, Pan, Lei, Che, Xiaoyu, He, Qinglin, Yin, Gen, Zheng, Cheng, Yu, Guoqiang, Nie, Tianxiao, Masir, Massoud R., MacDonald, Allan H., and Wang, Kang L.. Mon . "Unidirectional Magneto-Resistance in Modulation-Doped Magnetic Topological Insulators". United States. https://doi.org/10.1021/acs.nanolett.8b03702. https://www.osti.gov/servlets/purl/1566552.
@article{osti_1566552,
title = {Unidirectional Magneto-Resistance in Modulation-Doped Magnetic Topological Insulators},
author = {Fan, Yabin and Shao, Qiming and Pan, Lei and Che, Xiaoyu and He, Qinglin and Yin, Gen and Zheng, Cheng and Yu, Guoqiang and Nie, Tianxiao and Masir, Massoud R. and MacDonald, Allan H. and Wang, Kang L.},
abstractNote = {Nonlinear unidirectional spin Hall magnetoresistance (USMR) has been reported in heavy metal/ferromagnet bilayers, which could be employed as an effective method in detecting the magnetization orientation in spintronic devices with 2-terminal geometry. Recently, another unidirectional magnetoresistance (UMR) was reported in magnetic topological insulator (TI)-based heterostructures at cryogenic temperature, whose amplitude is orders of magnitude larger than the USMR measured in heavy metal-based magnetic heterostructures at room temperature. Here, we report the UMR effect in the modulation-doped magnetic TI structures. This UMR arises due to the interplay between the magnetic dopant’s magnetization and the current-induced surface spin polarization, when they are parallel or antiparallel to each other in the TI material. By varying the dopant’s position in the structure, we reveal that the UMR is mainly originating from the interaction between the magnetization and the surface spin-polarized carriers (not bulk carriers). Furthermore, from the magnetic field-, the angular rotation-, and the temperature-dependence, we highlight the correlation between the UMR effect and the magnetism in the structures. The large UMR versus current ratio in TI-based magnetic bilayers promises the easy readout in TI-based spintronic devices with 2-terminal geometry.},
doi = {10.1021/acs.nanolett.8b03702},
journal = {Nano Letters},
number = 2,
volume = 19,
place = {United States},
year = {Mon Jan 28 00:00:00 EST 2019},
month = {Mon Jan 28 00:00:00 EST 2019}
}

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Works referencing / citing this record:

Topological nanomaterials
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Magnetic proximity and nonreciprocal current switching in a monolayer WTe2 helical edge
journal, March 2020