| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Ultrafast Magnetization Precession in Perpendicularly Magnetized $L1_{0}$-MnAl Thin Films with Co$_{2}$MnSi Buffer Layers |
| Si-Wei Mao1,2, Jun Lu3, Long Yang4, Xue-Zhong Ruan4, Hai-Long Wang1,2, Da-Hai Wei1,2,3, Yong-Bing Xu4, Jian-Hua Zhao1,2,3** |
1State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083
2Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100190
3Beijing Academy of Quantum Information Science, Beijing 100193
4Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials, Collaborative Innovation Center of Advanced Microstructures, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093
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| Cite this article: |
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Si-Wei Mao, Jun Lu, Long Yang et al 2020 Chin. Phys. Lett. 37 058501 |
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Abstract Perpendicularly magnetized $L1_{0}$-MnAl thin films with Co$_{2}$MnSi buffer layers were prepared on GaAs (001) substrates by molecular-beam epitaxy (MBE). The samples with high crystalline quality show a maximum uniaxial perpendicular magnetic anisotropy constant of $1.4\times 10^{7}$ erg/cm$^{3}$. Ultrafast spin dynamics with a magnetization precession frequency up to 200 GHz was investigated by using time-resolved magneto-optical Kerr effect (TRMOKE) measurements, from which the Gilbert damping constant $\alpha$ of epitaxial $L1_{0}$-MnAl thin films is evaluated to be less than 0.0175. This work provides an important reference for analyzing the current-induced magnetization switching process in MnAl-based spintronic devices.
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Received: 17 January 2020
Published: 25 April 2020
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| PACS: |
85.75.-d
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(Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields)
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46.40.Ff
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(Resonance, damping, and dynamic stability)
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75.30.Gw
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(Magnetic anisotropy)
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| Fund: Supported by the National Key R&D Program of China (Grant No. 2018YFB0407601), the Key Research Project of Frontier Science of Chinese Academy of Sciences (Grant Nos. QYZDY-SSW-JSC015 and XDPB12), and the National Natural Science Foundation of China (Grant Nos. 11834013, 11874349, and 11774339). |
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