预测具有高居里温度、大谷极化和磁晶各向异性的二维铁磁Janus VSeTe单层。

Predicted 2D ferromagnetic Janus VSeTe monolayer with high Curie temperature, large valley polarization and magnetic crystal anisotropy.

作者信息

Guan Zhaoyong, Ni Shuang

机构信息

Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong 250100, P. R. China.

出版信息

Nanoscale. 2020 Nov 19;12(44):22735-22742. doi: 10.1039/d0nr04837b.

DOI:10.1039/d0nr04837b

PMID:33170918

Abstract

The development of two-dimensional (2D) intrinsic ferromagnetic semiconductors is urgent in the spintronic field. Motivated by the recent experiments on the successful synthetization of monolayer (ML) Janus transition-metal dichalcogenides (MoSSe) and ferromagnetic (FM) VSe2, a highly stable ML Janus 2H-VSeTe is fabricated by density functional theory and confirmed by a global minimum search. The Janus VSeTe shows a large valley polarization of 158 meV as the space- and time-reversal symmetry is broken. The VSeTe shows FM order with Curie temperature (Tc) of 350 K and a sizable magnetocrystalline anisotropy (MCA) of -8.54 erg cm-2. The high Tc and large valley polarization suggest the 2D Janus VSeTe is a promising magnetic material for potential applications in electronics, spintronics, and valleytronics.

摘要

二维本征铁磁半导体的发展在自旋电子学领域迫在眉睫。受近期关于单层（ML）Janus过渡金属二硫属化物（MoSSe）成功合成以及铁磁（FM）VSe2的实验启发，通过密度泛函理论制备了一种高度稳定的ML Janus 2H-VSeTe，并通过全局最小值搜索得到证实。由于空间和时间反演对称性被打破，Janus VSeTe显示出158 meV的大谷极化。VSeTe表现出铁磁序，居里温度（Tc）为350 K，磁晶各向异性（MCA）为-8.54 erg cm-2。高Tc和大谷极化表明二维Janus VSeTe是一种有前途的磁性材料，在电子学、自旋电子学和谷电子学中有潜在应用。