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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2407.03676 |
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| _version_ | 1866909241518850048 |
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| author | Zhang, Zhe Li, Zhuoyi Chen, Yuzhe Zhu, Fangyuan Yan, Yu Li, Yao He, Liang Du, Jun Zhang, Rong Wu, Jing Lu, Xianyang Xu, Yongbing |
| author_facet | Zhang, Zhe Li, Zhuoyi Chen, Yuzhe Zhu, Fangyuan Yan, Yu Li, Yao He, Liang Du, Jun Zhang, Rong Wu, Jing Lu, Xianyang Xu, Yongbing |
| contents | Realizing deterministic current-induced spin-orbit torque (SOT) magnetization switching, especially in systems exhibiting perpendicular magnetic anisotropy (PMA), typically requires the application of a collinear in-plane field, posing a challenging problem. In this study, we successfully achieve field-free SOT switching in the CoFeB/MgO system. In a Ta/CoFeB/MgO/NiO/Ta structure, spin reflection at the NiO interface, characterized by noncollinear spin structures with canted magnetization, generates a spin current with an out-of-plane spin polarization σz. We confirm the contribution of σz to the field-free SOT switching through measurements of the shift effect in the out-of-plane magnetization hysteresis loops under different currents. The incorporation of NiO as an antiferromagnetic insulator, mitigates the current shunting effect and ensures excellent thermal stability of the device. The sample with 0.8 nm MgO and 2 nm NiO demonstrates an impressive optimal switching ratio approaching 100% without an in-plane field. This breakthrough in the CoFeB/MgO system promises significant applications in spintronics, advancing us closer to realizing innovative technologies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_03676 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Out-of-Plane Polarization from Spin Reflection Induces Field-Free Spin-Orbit Torque Switching in Structures with Canted NiO Interfacial Moments Zhang, Zhe Li, Zhuoyi Chen, Yuzhe Zhu, Fangyuan Yan, Yu Li, Yao He, Liang Du, Jun Zhang, Rong Wu, Jing Lu, Xianyang Xu, Yongbing Applied Physics Realizing deterministic current-induced spin-orbit torque (SOT) magnetization switching, especially in systems exhibiting perpendicular magnetic anisotropy (PMA), typically requires the application of a collinear in-plane field, posing a challenging problem. In this study, we successfully achieve field-free SOT switching in the CoFeB/MgO system. In a Ta/CoFeB/MgO/NiO/Ta structure, spin reflection at the NiO interface, characterized by noncollinear spin structures with canted magnetization, generates a spin current with an out-of-plane spin polarization σz. We confirm the contribution of σz to the field-free SOT switching through measurements of the shift effect in the out-of-plane magnetization hysteresis loops under different currents. The incorporation of NiO as an antiferromagnetic insulator, mitigates the current shunting effect and ensures excellent thermal stability of the device. The sample with 0.8 nm MgO and 2 nm NiO demonstrates an impressive optimal switching ratio approaching 100% without an in-plane field. This breakthrough in the CoFeB/MgO system promises significant applications in spintronics, advancing us closer to realizing innovative technologies. |
| title | Out-of-Plane Polarization from Spin Reflection Induces Field-Free Spin-Orbit Torque Switching in Structures with Canted NiO Interfacial Moments |
| topic | Applied Physics |
| url | https://arxiv.org/abs/2407.03676 |