Drastic change of magnetic anisotropy in Fe3GeTe2 and Fe4GeTe2 monolayers under electric field studied by density functional theory

Author:

Kim Dongwook,Lee Changhoon,Jang Bo Gyu,Kim Kyoo,Shim Ji Hoon

Abstract

AbstractMagnetic anisotropy energy (MAE) is one of the most important properties in two-dimensional magnetism since the magnetization in two dimension is vulnerable to the spin rotational fluctuations. Using density functional theory calculation, we show that perpendicular electric field dramatically enhances the in-plane and out-of-plane magnetic anisotropies in Fe3GeTe2 and Fe4GeTe2 monolayers, respectively, allowing the change of easy axis in both systems. The changes of the MAE under the electric field are understood as the result of charge redistribution inside the layer, which is available due to the three-dimensional (3D) network of Fe atoms in the monolayers. As a result, we suggest that due to the unique structure of FenGeTe2 compounds composed by peculiar 3D networks of metal atoms, the MAE can be dramatically changed by the external perpendicular electric field.

Funder

National Research Foundation of Korea

Ministry of Science and ICT, South Korea

KIAS individual Grant at Korea Institute for Advanced Study

Publisher

Springer Science and Business Media LLC

Subject

Multidisciplinary

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