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arXiv · 2609.39806

$μ$SR measurements of 3D Ising ferromagnetism in bulk Fe$_3$GeTe$_2$ crystals

M. N. Wilson·J. Huang·T. J. Hicken·D. A. Mayoh·B. M. Huddart·G. Balakrishnan·T. Lancaster
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Abstract

Fe$_3$GeTe$_2$ is a quasi-two-dimensional itinerant ferromagnet with a van-der-Waals layered structure that exhibits substantial magnetic anisotropy. In bulk samples, this material becomes magnetically ordered below 220~K, while in thin samples, the gate-tunability of the ferromagnetic moment has attracted significant interest. Alongside high-temperature ferromagnetism, a low-temperature magnetic state occurs whose nature has not been conclusively identified, with some studies suggesting a transition between ferromagnetism and antiferromagnetism with temperature. Here we present magnetometry and $μ$SR data that demonstrate that Fe$_3$GeTe$_2$ exhibits three-dimenional Ising-like ferromagnetism over the entire temperature range between $T_{C}=220$~K and 2~K. The feature at 170~K that has previously been proposed to be a transition to antiferromagnetism is instead likely to represent a domain-freezing transition.

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M. N. Wilson, J. Huang, T. J. Hicken, D. A. Mayoh, B. M. Huddart, G. Balakrishnan, T. Lancaster. 2026-09-30. $μ$SR measurements of 3D Ising ferromagnetism in bulk Fe$_3$GeTe$_2$ crystals. https://arxiv.org/abs/2609.39806

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