| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Ferromagnetic MnSn Monolayer Epitaxially Grown on Silicon Substrate |
| Qian-Qian Yuan1, Zhaopeng Guo1, Zhi-Qiang Shi1, Hui Zhao1, Zhen-Yu Jia1, Qianjin Wang1, Jian Sun1,2, Di Wu1,2, and Shao-Chun Li1,2,3* |
1National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China
2Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
3Jiangsu Provincial Key Laboratory for Nanotechnology, Nanjing University, Nanjing 210093, China
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| Cite this article: |
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Qian-Qian Yuan, Zhaopeng Guo, Zhi-Qiang Shi et al 2020 Chin. Phys. Lett. 37 077502 |
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Abstract Two-dimensional (2D) ferromagnetic materials have been exhibiting promising potential in applications, such as spintronics devices. To grow epitaxial magnetic films on silicon substrate, in the single-layer limit, is practically important but challenging. In this study, we realized the epitaxial growth of MnSn monolayer on Si(111) substrate, with an atomically thin Sn/Si(111)-$2\sqrt 3 \times 2\sqrt 3$-buffer layer, and controlled the MnSn thickness with atomic-layer precision. We discovered the ferromagnetism in MnSn monolayer with the Curie temperature ($T_{\rm c}$) of ${\sim} 54$ K. As the MnSn film is grown to 4 monolayers, $T_{\rm c}$ increases accordingly to ${\sim} 235$ K. The lattice of the epitaxial MnSn monolayer as well as the Sn/Si(111)-$2\sqrt 3 \times 2\sqrt 3$ is perfectly compatible with silicon, and thus an sharp interface is formed between MnSn, Sn and Si. This system provides a new platform for exploring the 2D ferromagnetism, integrating magnetic monolayers into silicon-based technology, and engineering the spintronics heterostructures.
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Received: 30 April 2020
Published: 07 June 2020
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| PACS: |
75.70.Ak
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(Magnetic properties of monolayers and thin films)
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75.70.-i
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(Magnetic properties of thin films, surfaces, and interfaces)
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81.15.Hi
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(Molecular, atomic, ion, and chemical beam epitaxy)
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68.37.Ef
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(Scanning tunneling microscopy (including chemistry induced with STM))
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| Fund: This work was supported by the National Natural Science Foundation of China (Grant Nos. 11774149, 11790311, 11574133, and 11834006) and the National Key R&D Program of China (Grant Nos. 2016YFA0300404, 2015CB921202, and 2014CB921103). |
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