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Influence of exchange bias on spin torque ferromagnetic resonancefor quantification of spin-orbit torque efficiency |
| Qian Zhao(赵乾)1, Tengfei Zhang(张腾飞)1, Bin He(何斌)2,3, Zimu Li(李子木)1, Senfu Zhang(张森富)1, GuoqiangYu(于国强)2,3, Jianbo Wang(王建波)1,4, Qingfang Liu(刘青芳)1, and Jinwu Wei(魏晋武)1,† |
1 Key Laboratory for Magnetism and Magnetic Materials of the Ministry ofEducation, Lanzhou University, Lanzhou 730000, China;
2 Beijing National Laboratory for Condensed Matter Physics, Institute ofPhysics, Chinese Academy of Sciences, Beijing 100190, China;
3 Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;
4 Key Laboratory of Special Functional Materials and Structural Design, Ministry of Education, Lanzhou University, Lanzhou 730000, China |
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Abstract Antiferromagnet (AFM)/ferromagnet (FM) heterostructure is a popular systemfor studying the spin--orbit torque (SOT) of AFMs. However, the interfacialexchange bias field induces that the magnetization in FM layer isnoncollinear to the external magnetic field, namely the magnetic moment drageffect, which further influences the characteristic of SOT efficiency. Inthis work, we study the SOT efficiencies of IrMn/NiFe bilayers with stronginterfacial exchange bias by using spin-torque ferromagnetic resonance(ST-FMR) method. A full analysis on the AFM/FM systems with exchange bias isperformed, and the angular dependence of magnetization on external magneticfield is determined through the minimum rule of free energy. The ST-FMRresults can be well fitted by this model. We obtained the relative accurateSOT efficiency $\xi_{\rm DL} = 0.058$ for the IrMn film. This work providesa useful method to analyze the angular dependence of ST-FMR results andfacilitates the accurate measurement of SOT efficiency for the AFM/FMheterostructures with strong exchange bias.
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Received: 21 November 2023
Revised: 22 February 2024
Accepted manuscript online:
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PACS:
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85.75.-d
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(Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields)
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75.50.Ee
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(Antiferromagnetics)
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76.50.+g
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(Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2021YFB3601300),the National Natural Science Foundation of China (GrantNos. 52201290, 12074158, and 12174166), and the Fundamental Research Funds for the Central Universities (GrantNo. lzujbky-2022-kb01). |
Corresponding Authors:
Jinwu Wei,E-mail:weijw@lzu.edu.cn
E-mail: weijw@lzu.edu.cn
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Cite this article:
Qian Zhao(赵乾), Tengfei Zhang(张腾飞), Bin He(何斌), Zimu Li(李子木), Senfu Zhang(张森富), GuoqiangYu(于国强), Jianbo Wang(王建波), Qingfang Liu(刘青芳), and Jinwu Wei(魏晋武) Influence of exchange bias on spin torque ferromagnetic resonancefor quantification of spin-orbit torque efficiency 2024 Chin. Phys. B 33 058502
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