Built-in electric field control of magnetic coupling in van der Waals semiconductors

Chengxi Huang, Jing-Han Guan, Qiongyu Li, Fang Wu, P. Jena, E. Kan
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引用次数: 3

Abstract

Electrical control of magnetism in a two-dimensional (2D) semiconductor is of great interest for emerging nanoscale low-dissipation spintronic devices. Here, we propose a general approach of tuning magnetic coupling and anisotropy of a van der Waals (vdW) 2D magnetic semiconductor via a built-in electric field generated by the adsorption of superatomic ions. Using first-principles calculations, we predict a significant enhancement of ferromagnetic (FM) coupling and a great change of magnetic anisotropy in 2D semiconductors when they are sandwiched between superatomic cations and anions. The magnetic coupling is directly affected by the built-in electric field, which lifts the energy levels of mediated ligands' orbitals and enhances the super-exchange interactions. These findings will be of interest for ionic gating controlled ferromagnets and magnetoelectronics based on vdW 2D semiconductors.
范德华半导体中磁耦合的内置电场控制
二维半导体中磁性的电气控制对于新兴的纳米级低耗散自旋电子器件具有重要意义。在这里,我们提出了一种通过超原子离子吸附产生的内置电场来调节范德华二维磁性半导体的磁耦合和各向异性的一般方法。利用第一性原理计算,我们预测了当二维半导体夹在超原子阳离子和阴离子之间时,铁磁(FM)耦合会显著增强,磁性各向异性会发生巨大变化。内嵌电场直接影响磁耦合,提高了介导配体轨道的能级,增强了超交换相互作用。这些发现将对离子门控铁磁体和基于vdW二维半导体的磁电子学产生兴趣。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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