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

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

doi:10.1126/sciadv.aau6696

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

Journal Article · Fri May 10 00:00:00 EDT 2019 · Science Advances

DOI:https://doi.org/10.1126/sciadv.aau6696· OSTI ID:1515692

^[1]; Wang, Xiao ^[2];

^[3]; Yu, Jihang ^[1]; Fu, Huixia ^[4]; Liu, Liang ^[1]; Chen, Shaohai ^[1]; Deng, Jinyu ^[1]; Lin, Weinan ^[1]; Shu, Xinyu ^[1]; Yoong, Herng Yau ^[1];

^[3];

^[3]; Yang, Ping ^[1];

^[1];

^[4]; Han, Xiufeng ^[2];

^[5]

National Univ. of Singapore (Singapore)
Chinese Academy of Sciences (CAS), Beijing (China)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Weizmann Institute of Science, Rehovot (Israel)
National Univ. of Singapore (Singapore); National Univ. of Singapore, Suzhou (China)

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1515692

Journal Information:: Science Advances, Vol. 5, Issue 5; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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