@article{7807943973224f58805b5711d2655015,
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.",
author = "Jing Zhou and Xiao Wang and Yaohua Liu and Jihang Yu and Huixia Fu and Liang Liu and Shaohai Chen and Jinyu Deng and Weinan Lin and Xinyu Shu and Yoong, {Herng Yau} and Tao Hong and Masaaki Matsuda and Ping Yang and Stefan Adams and Binghai Yan and Xiufeng Han and Jingsheng Chen",
note = "We thank S. K. He for the advice on ST-FMR system design and measurement. We thank C. Sun for the constructive discussion on SOT and structures of IrMn. Funding: This project was partially supported by the National Key Research and Development Program of China (title: Nonvolatile and programmable spin logics based on magnetic heterostructures; grant no. 2017YFA0206200) for the device microfabrications. We would like to acknowledge SSLS for providing the facility necessary for conducting the research. P.Y. was supported by SSLS via NUS Core Support C-380-003-003-001. The Laboratory is a National Research Infrastructure under the National Research Foundation (NRF) Singapore. A portion of this research used resources at the High Flux Isotope Reactor and Spallation Neutron Source, U.S. DOE Office of Science User Facilities operated by the Oak Ridge National Laboratory. J.C. is a member of Singapore Spintronics Consortium (SG-SPIN). This research was supported by Singapore National Research Foundation under CRP award no. NRF-CRP10-2012-02 and IIP award no. NRF-IIP001-001. B.Y. acknowledges the financial support by a research grant from the Benoziyo Endowment Fund for the Advancement of Science. This manuscript has been authored by UT-Battelle, LLC under contract no. DE-AC05-00OR22725 with the U.S. Department of Energy. The U.S. government retains and the publisher, by accepting the article for publication, acknowledges that the U.S. government retains a nonexclusive, paid-up, irrevocable, and worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for U.S. government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).",
year = "2019",
month = may,
day = "10",
doi = "https://doi.org/10.1126/sciadv.aau6696",
language = "الإنجليزيّة",
volume = "5",
journal = "Science Advances",
issn = "2375-2548",
publisher = "American Association for the Advancement of Science",
number = "5",
}