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

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${}_2$.

arXiv comment7 pages, 7 figures

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Cited by in corpus (2)

• An effective spin model on the honeycomb lattice for the description of magnetic properties in two-dimensional Fe${}_3$GeTe${}_2$
• Phonon-induced renormalization of exchange interactions in metallic two-dimensional magnets