2D-XY ferromagnetism with high transition temperature in Janus monolayer V${}_2$XN (X = P, As)

Abstract

Two-dimensional (2D) XY magnets with easy magnetization planes support the nontrivial topological spin textures whose dissipationless transport is highly desirable for 2D spintronic devices. Here, we predicted that Janus monolayer V${}_2$XN (X = P, As) with a square lattice are 2D-XY ferromagnets by first-principles calculations. Both the magnetocrystalline anisotropy and magnetic shape anisotropy favor an in-plane magnetization, leading to an easy magnetization $xy$-plane in Janus monolayer V${}_2$XN. Resting on the Monte Carlo simulations, we observed the Berezinskii-Kosterlitz-Thouless (BKT) phase transition in monolayer V${}_2$XN with transition temperature $T_{\mathrm{BKT}}$ being above the room temperature. Especially, monolayer V${}_2$AsN has a magnetic anisotropy energy (MAE) of 292.0 $\mu$eV per V atom and a $T_{\mathrm{BKT}}$ of 434 K, which is larger than that of monolayer V${}_2$PN. Moreover, a tensile strain of 5\% can further improve the $T_{\mathrm{BKT}}$ of monolayer V${}_2$XN to be above 500 K. Our results indicated that Janus monolayer V${}_2$XN (X = P, As) were candidate materials to realize high-temperature 2D-XY ferromagnetism for spintronics applications.

arXiv comment18 pages, 7 figures

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