Kezilebieke Shawulienu, Silveira Orlando J, Huda Md N, Vaňo Viliam, Aapro Markus, Ganguli Somesh Chandra, Lahtinen Jouko, Mansell Rhodri, van Dijken Sebastiaan, Foster Adam S, Liljeroth Peter
Department of Applied Physics, Aalto University, Aalto, FI-00076, Finland.
Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, Kakuma-machi, Kanazawa, 920-1192, Japan.
Adv Mater. 2021 Jun;33(23):e2006850. doi: 10.1002/adma.202006850. Epub 2021 May 3.
The ability to imprint a given material property to another through a proximity effect in layered 2D materials has opened the way to the creation of designer materials. Here, molecular-beam epitaxy is used for direct synthesis of a superconductor-ferromagnet heterostructure by combining superconducting niobium diselenide (NbSe ) with the monolayer ferromagnetic chromium tribromide (CrBr ). Using different characterization techniques and density-functional theory calculations, it is confirmed that the CrBr monolayer retains its ferromagnetic ordering with a magnetocrystalline anisotropy favoring an out-of-plane spin orientation. Low-temperature scanning tunneling microscopy measurements show a slight reduction of the superconducting gap of NbSe and the formation of a vortex lattice on the CrBr layer in experiments under an external magnetic field. The results contribute to the broader framework of exploiting proximity effects to realize novel phenomena in 2D heterostructures.
通过层状二维材料中的邻近效应将给定材料特性赋予另一种材料的能力，为设计材料的创造开辟了道路。在此，分子束外延用于通过将超导二硒化铌（NbSe₂）与单层铁磁三溴化铬（CrBr₃）相结合，直接合成超导体-铁磁体异质结构。使用不同的表征技术和密度泛函理论计算，证实了CrBr₃单层保持其铁磁有序性，具有有利于面外自旋取向的磁晶各向异性。低温扫描隧道显微镜测量表明，在外部磁场下的实验中，NbSe₂的超导能隙略有减小，并且在CrBr₃层上形成了涡旋晶格。这些结果有助于在更广泛的框架内利用邻近效应来实现二维异质结构中的新现象。
