Ferromagnetic MnSn Monolayer Epitaxially Grown on Silicon Substrate

【摘要】 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 Mn Sn monolayer on Si（111） substrate,with an atomically thin Sn/Si（111）-23^1/2 × 23^1/2-buffer layer,and controlled the Mn Sn thickness with atomic-layer precision.We discovered the ferromagnetism in Mn Sn monolayer with the Curie temperature（T_c） of ～54 K.As the Mn Sn film is grown to 4 monolayers,T_c increases accordingly to ～235 K.The lattice of the epitaxial Mn Sn monolayer as well as the Sn/Si（111）-23^1/2 × 23^1/2 is perfectly compatible with silicon,and thus an sharp interface is formed between Mn Sn,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.更多还原

【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 Mn Sn monolayer on Si（111） substrate,with an atomically thin Sn/Si（111）-23^1/2 × 23^1/2-buffer layer,and controlled the Mn Sn thickness with atomic-layer precision.We discovered the ferromagnetism in Mn Sn monolayer with the Curie temperature（T_c） of ～54 K.As the Mn Sn film is grown to 4 monolayers,T_c increases accordingly to ～235 K.The lattice of the epitaxial Mn Sn monolayer as well as the Sn/Si（111）-23^1/2 × 23^1/2 is perfectly compatible with silicon,and thus an sharp interface is formed between Mn Sn,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.更多还原