CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Magnetization Reversal of Single-Molecular Magnets by a Spin-Polarized Current |
Chao Yang1, Zheng-Chuan Wang1*, and Gang Su1,2* |
1School of Physical Sciences, University of Chinese Academy of Sciences, Beijng 100049, China 2Kavli Institute for Theoretical Physics, CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China
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Cite this article: |
Chao Yang, Zheng-Chuan Wang, and Gang Su 2020 Chin. Phys. Lett. 37 087201 |
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Abstract We study the magnetization reversal of single-molecular magnets by a spin-polarized current in the framework of the spinor Boltzmann equation. Because of the spin–orbit coupling, the spin-polarized current will impose a non-zero spin transfer torque on the single-molecular magnets, which will induce the magnetization switching of the latter. Via the $s$–$d$ exchange interaction between the conducting electrons and single-molecular magnets, we can investigate the magnetization dynamics of single-molecular magnets. We demonstrate the dynamics of the magnetization based on the spin diffusion equation and the Heisenberg-like equation. The results show that when the current is large enough, the magnetization of the single-molecular magnets can be reversed. We also calculate the critical current density required for the magnetization reversal under different anisotropy and external magnetic fields, which is helpful for the corresponding experimental design.
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Received: 13 May 2020
Published: 28 July 2020
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PACS: |
72.25.-b
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(Spin polarized transport)
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75.75.-c
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(Magnetic properties of nanostructures)
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75.78.-n
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(Magnetization dynamics)
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Fund: Supported by the National Key R&D Program of China (Grant No. 2018YFA0305804), the National Natural Science Foundation of China (Grant No. 11834014), and the Strategetic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB28000000). |
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