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Issue 25, 2020
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Origin of ferromagnetism and the effect of doping on Fe3GeTe2

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Abstract

Recent experimental findings of two dimensional ferromagnetism in Fe3GeTe2, whose critical temperature can reach room temperature by gating, has attracted great research interest. Here we performed elaborate ab initio studies using density functional theory, dynamical mean-field theory and magnetic force response theory. In contrast to the conventional wisdom, it is unambiguously shown that Fe3GeTe2 is not ferromagnetic but is antiferromagnetic, carrying zero net moment in its stoichiometric phase. Fe defect and hole doping are the keys to make this material ferromagnetic as supported by previously disregarded experiments. Furthermore, we found that electron doping also induces the antiferro- to ferro-magnetic transition. It is crucial to understand the notable recent experiments on gate-controlled ferromagnetism. Our results not only reveal the origin of ferromagnetism of this material but also show how it can be manipulated with defects and doping.

Graphical abstract: Origin of ferromagnetism and the effect of doping on Fe3GeTe2

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Article information


Submitted
01 Dec 2019
Accepted
18 May 2020
First published
21 May 2020

Nanoscale, 2020,12, 13501-13506
Article type
Paper

Origin of ferromagnetism and the effect of doping on Fe3GeTe2

S. W. Jang, H. Yoon, M. Y. Jeong, S. Ryee, H. Kim and M. J. Han, Nanoscale, 2020, 12, 13501
DOI: 10.1039/C9NR10171C

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