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arXiv · 2303.01888

An effective spin model on the honeycomb lattice for the description of magnetic properties in two-dimensional Fe$_3$GeTe$_2$

Georgy V. Pushkarev·Danis I. Badrtdinov·Ilia A. Iakovlev·Vladimir V. Mazurenko·Alexander N. Rudenko
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Abstract

Fe$_3$GeTe$_2$ attracts significant attention due to technological perspectives of realizing room temperature ferromagnetism in two-dimensional materials. Here we show that due to structural peculiarities of the Fe$_3$GeTe$_2$ monolayer, short distance between the neighboring iron atoms induces a strong exchange coupling. This strong coupling allows us to consider them as an effective cluster with a magnetic moment $\sim$5 $\mu_B$, giving rise to a simplified spin model on a bipartite honeycomb lattice with the reduced number of long-range interactions. The simplified model perfectly reproduces the results of the conventional spin model, but allows for a more tractable description of the magnetic properties of Fe$_3$GeTe$_2$, which is important, e.g., for large-scale simulations. Also, we discuss the role of biaxial strain in the stabilization of ferromagnetic ordering in Fe$_3$GeTe$_2$.

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Georgy V. Pushkarev, Danis I. Badrtdinov, Ilia A. Iakovlev, Vladimir V. Mazurenko, Alexander N. Rudenko. 2023-03-03. An effective spin model on the honeycomb lattice for the description of magnetic properties in two-dimensional Fe$_3$GeTe$_2$. https://doi.org/10.1016/j.jmmm.2023.171456

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