Magnetic asymmetry induced anomalous spin-orbit torque in IrMn

Jing Zhou; Xinyu Shu; Yaohua Liu; Xiao Wang; Weinan Lin; Shaohai Chen; Liang Liu; Qidong Xie; Tao Hong; Ping Yang; Binghai Yan; Xiufeng Han; Jingsheng Chen

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Magnetic asymmetry induced anomalous spin-orbit torque in IrMn

机译：磁性不对称诱导IRMN中的异常旋转轨道扭矩

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We demonstrate an anomalous spin-orbit torque induced by the broken magnetic symmetry in the antifer-romagnet IrMn. We study the magnetic structure of three phases of IrMn thin films using neutron diffraction technique. The magnetic mirror symmetry M' is broken laterally in both Ll_0-IrMn and Ll_2-IrMn_3 but not γ-IrMn_3. We observe an out-of-plane dampinglike spin-orbit torque in both Ll_0-IrMn/permalloy and Ll_2-IrMn_3/permalloy bilayers but not in γ-IrMn_3/permalloy. This is consistent with both the symmetry analysis on the effects of a broken M' on spin-orbit torque and the theoretical predictions of the spin Hall effect and the Rashba-Edelstein effect. In addition, the measured spin-orbit torque efficiencies are 0.61 ± 0.01, 1.01 ± 0.03, and 0.80 ± 0.01 for the Ll_0, Ll_2, and γ phases, respectively. Our work highlights the critical roles of the magnetic asymmetry in spin-orbit torque generation.

机译：我们展示了由防灰质 - 罗马网IRMN中破碎的磁对称引起的异常旋转轨道扭矩。我们使用中子衍射技术研究了IRMN薄膜三相的磁性结构。磁镜对称M'在LL_0-IRMN和LL_2-IRMN_3中横向地破裂，但不是γ-IRMN_3。我们在LL_0-IRMN / PERPOLOY和LL_2-IRMN_3 / PERPOLOY双层中观察平面外阻尼旋转轨道扭矩，但不在γ-IRMN_3 / oppolyoy中。这与对称性M'对旋转轨道扭矩的影响的对称性分析以及旋转霍尔效应的理论预测和拉什巴 - 爱德斯坦效应的影响。此外，对于LL_0，LL_2和γ相，测量的旋转轨道扭矩效率分别为0.61±0.01,1.01±0.03和0.80±0.01。我们的作品突出了磁性不对称在旋转轨道扭矩产生中的关键作用。

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《Physical review》 |2020年第18期|184403.1-184403.11|共11页
作者
Jing Zhou; Xinyu Shu; Yaohua Liu; Xiao Wang; Weinan Lin; Shaohai Chen; Liang Liu; Qidong Xie; Tao Hong; Ping Yang; Binghai Yan; Xiufeng Han; Jingsheng Chen;
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Materials Science & Engineering National University of Singapore 9 Engineering Drive 1 117575 Singapore;

Materials Science & Engineering National University of Singapore 9 Engineering Drive 1 117575 Singapore;

Neutron Scattering Division Oak Ridge National laboratory Oak Ridge 37831 USA;

Institute of Physics and Beijing National laboratory for Condensed Matter Physics Chinese Academy of Sciences Beijing 100190 China;

Materials Science & Engineering National University of Singapore 9 Engineering Drive 1 117575 Singapore;

Materials Science & Engineering National University of Singapore 9 Engineering Drive 1 117575 Singapore;

Materials Science & Engineering National University of Singapore 9 Engineering Drive 1 117575 Singapore;

Materials Science & Engineering National University of Singapore 9 Engineering Drive 1 117575 Singapore;

Neutron Scattering Division Oak Ridge National laboratory Oak Ridge 37831 USA;

Singapore Synchrotron Light Source (SSLS) National University of Singapore 5 Research Link 117603 Singapore Materials Science & Engineering National University of Singapore 9 Engineering Drive 1 117575 Singapore;

Department of condensed matter physics Weizmann Institute of Science Rehovot 7610001 Israel;

Institute of Physics and Beijing National laboratory for Condensed Matter Physics Chinese Academy of Sciences Beijing 100190 China;

Materials Science & Engineering National University of Singapore 9 Engineering Drive 1 117575 Singapore Suzhou Research Institute National University of Singapore Suzhou 215123 China;

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1. Magnetic asymmetry induced anomalous spin-orbit torque in IrMn [J] . Zhou Jing, Shu Xinyu, Liu Yaohua, Physical review, B . 2020,第18期

机译：磁性不对称诱导IRMN中的异常旋转轨道扭矩
2. Anomalous Hall effect and spin-orbit torques in MnGa/IrMn films: Modification from strong spin Hall effect of the antiferromagnet [J] . K. K. Meng, J. Miao, X. G. Xu, Physical review . 2016,第21期

机译：MnGa / IrMn薄膜中的异常霍尔效应和自旋轨道转矩：反铁磁体的强自旋霍尔效应的修正
3. Anomalous Hall effect and spin-orbit torques in MnGa/IrMn films: Modification from strong spin Hall effect of the antiferromagnet [J] . Meng K. K., Miao J., Xu X. G., Physical review, B . 2016,第21期

机译：MnGa / IrMn薄膜中的异常霍尔效应和自旋轨道转矩：反铁磁体的强自旋霍尔效应的修正
4. Field-free spin-orbit torque switching by utilizing gate-induced structural asymmetry [C] . Kento Hasegawa, Tomohiro Koyama, Daichi Chiba 応用物理学会春季学術講演会;応用物理学会 . -1

机译：通过利用栅极诱导的结构不对称，自由场自旋轨道扭矩切换
5. Dynamics of current-induced switching in spin-orbit torque magnetic devices. [D] . Legrand, William Sylvain. 2016

机译：自旋轨道转矩磁性装置中电流感应开关的动力学。
6. Large spin-orbit torque efficiency enhanced by magnetic structure of collinear antiferromagnet IrMn [O] . Jing Zhou, Xiao Wang, Yaohua Liu, 2019

机译：共线反铁磁体IrMn的磁性结构提高了大自旋轨道的转矩效率
7. Giant facet-dependent spin-orbit torque and spin Hall conductivity in the triangular antiferromagnet IrMn₃ [O] . Zhang, W., Han, W., Yang, S., 2016

机译：三角反铁磁Irmn _{3 中巨大小面依赖的自旋轨道扭矩和自旋霍尔电导率}

Magnetic asymmetry induced anomalous spin-orbit torque in IrMn

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