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Title: Large spin-orbit torque efficiency enhanced by magnetic structure of collinear antiferromagnet IrMn

Abstract

Spin-orbit torque (SOT) offers promising approaches to developing energy-efficient memory devices by electric switching of magnetization. Compared to other SOT materials, metallic antiferromagnet (AFM) potentially allows the control of SOT through its magnetic structure. Here, combining the results from neutron diffraction and spin-torque ferromagnetic resonance experiments, we show that the magnetic structure of epitaxially grown L1 0-IrMn (a collinear AFM) is distinct from the widely presumed bulk one. It consists of twin domains, with the spin axes orienting toward [111] and [–111], respectively. This unconventional magnetic structure is responsible for much larger SOT efficiencies up to 0.60 ± 0.04, compared to 0.083 ± 0.002 for the polycrystalline IrMn. Furthermore, we reveal that this magnetic structure induces a large isotropic bulk contribution and a comparable anisotropic interfacial contribution to the SOT efficiency. Our findings shed light on the critical roles of bulk and interfacial antiferromagnetism to SOT generated by metallic AFM.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3];  [1];  [4];  [1];  [1];  [1];  [1];  [1];  [1]; ORCiD logo [3]; ORCiD logo [3];  [1]; ORCiD logo [1]; ORCiD logo [4];  [2]; ORCiD logo [5]
  1. National Univ. of Singapore (Singapore)
  2. Chinese Academy of Sciences (CAS), Beijing (China)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Weizmann Institute of Science, Rehovot (Israel)
  5. National Univ. of Singapore (Singapore); National Univ. of Singapore, Suzhou (China)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1515692
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 5; Journal Issue: 5; Journal ID: ISSN 2375-2548
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Zhou, Jing, Wang, Xiao, Liu, Yaohua, Yu, Jihang, Fu, Huixia, Liu, Liang, Chen, Shaohai, Deng, Jinyu, Lin, Weinan, Shu, Xinyu, Yoong, Herng Yau, Hong, Tao, Matsuda, Masaaki, Yang, Ping, Adams, Stefan, Yan, Binghai, Han, Xiufeng, and Chen, Jingsheng. Large spin-orbit torque efficiency enhanced by magnetic structure of collinear antiferromagnet IrMn. United States: N. p., 2019. Web. doi:10.1126/sciadv.aau6696.
Zhou, Jing, Wang, Xiao, Liu, Yaohua, Yu, Jihang, Fu, Huixia, Liu, Liang, Chen, Shaohai, Deng, Jinyu, Lin, Weinan, Shu, Xinyu, Yoong, Herng Yau, Hong, Tao, Matsuda, Masaaki, Yang, Ping, Adams, Stefan, Yan, Binghai, Han, Xiufeng, & Chen, Jingsheng. Large spin-orbit torque efficiency enhanced by magnetic structure of collinear antiferromagnet IrMn. United States. doi:10.1126/sciadv.aau6696.
Zhou, Jing, Wang, Xiao, Liu, Yaohua, Yu, Jihang, Fu, Huixia, Liu, Liang, Chen, Shaohai, Deng, Jinyu, Lin, Weinan, Shu, Xinyu, Yoong, Herng Yau, Hong, Tao, Matsuda, Masaaki, Yang, Ping, Adams, Stefan, Yan, Binghai, Han, Xiufeng, and Chen, Jingsheng. Fri . "Large spin-orbit torque efficiency enhanced by magnetic structure of collinear antiferromagnet IrMn". United States. doi:10.1126/sciadv.aau6696. https://www.osti.gov/servlets/purl/1515692.
@article{osti_1515692,
title = {Large spin-orbit torque efficiency enhanced by magnetic structure of collinear antiferromagnet IrMn},
author = {Zhou, Jing and Wang, Xiao and Liu, Yaohua and Yu, Jihang and Fu, Huixia and Liu, Liang and Chen, Shaohai and Deng, Jinyu and Lin, Weinan and Shu, Xinyu and Yoong, Herng Yau and Hong, Tao and Matsuda, Masaaki and Yang, Ping and Adams, Stefan and Yan, Binghai and Han, Xiufeng and Chen, Jingsheng},
abstractNote = {Spin-orbit torque (SOT) offers promising approaches to developing energy-efficient memory devices by electric switching of magnetization. Compared to other SOT materials, metallic antiferromagnet (AFM) potentially allows the control of SOT through its magnetic structure. Here, combining the results from neutron diffraction and spin-torque ferromagnetic resonance experiments, we show that the magnetic structure of epitaxially grown L10-IrMn (a collinear AFM) is distinct from the widely presumed bulk one. It consists of twin domains, with the spin axes orienting toward [111] and [–111], respectively. This unconventional magnetic structure is responsible for much larger SOT efficiencies up to 0.60 ± 0.04, compared to 0.083 ± 0.002 for the polycrystalline IrMn. Furthermore, we reveal that this magnetic structure induces a large isotropic bulk contribution and a comparable anisotropic interfacial contribution to the SOT efficiency. Our findings shed light on the critical roles of bulk and interfacial antiferromagnetism to SOT generated by metallic AFM.},
doi = {10.1126/sciadv.aau6696},
journal = {Science Advances},
number = 5,
volume = 5,
place = {United States},
year = {2019},
month = {5}
}

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Cited by: 3 works
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Figures / Tables:

Fig. 1 Fig. 1: Structure of L10-IrMn. (A) Schematic drawing of L10-IrMn unit cell. (B) XRD θ-2θ scan of IrMn along the (001) direction. Dotted lines show the reference peak positions of bulk L10-IrMn. a.u., arbitrary units. (C and D) RSMs around (113) and (103) planes, respectively. (E) HRTEM image of crossmore » section of L10-IrMn thin film. Diffraction patterns from the substrate, interface, and IrMn are shown on the right.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.