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Influence of exchange bias on spin torque ferromagnetic resonance for 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, Guoqiang Yu(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 of Education, Lanzhou University, Lanzhou 730000, China;
2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, 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 system for studying the spin-orbit torque (SOT) of AFMs. However, the interfacial exchange bias field induces that the magnetization in FM layer is noncollinear to the external magnetic field, namely the magnetic moment drag effect, which further influences the characteristic of SOT efficiency. In this work, we study the SOT efficiencies of IrMn/NiFe bilayers with strong interfacial exchange bias by using spin-torque ferromagnetic resonance (ST-FMR) method. A full analysis on the AFM/FM systems with exchange bias is performed, and the angular dependence of magnetization on external magnetic field is determined through the minimum rule of free energy. The ST-FMR results can be well fitted by this model. We obtained the relative accurate SOT efficiency $\xi_{\rm DL} = 0.058$ for the IrMn film. This work provides a useful method to analyze the angular dependence of ST-FMR results and facilitates the accurate measurement of SOT efficiency for the AFM/FM heterostructures with strong exchange bias.
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Received: 21 November 2023
Revised: 22 February 2024
Accepted manuscript online: 27 February 2024
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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 (Grant Nos. 52201290, 12074158, and 12174166), and the Fundamental Research Funds for the Central Universities (Grant No. lzujbky-2022-kb01). |
Corresponding Authors:
Jinwu Wei
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), Guoqiang Yu(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 resonance for quantification of spin-orbit torque efficiency 2024 Chin. Phys. B 33 058502
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