论文标题
Janus Monolayer v $ _ {2} $ xn（x = p，as）的2D-XY Ferromagnetism具有高过渡温度的高过渡温度
2D-XY ferromagnetism with high transition temperature in Janus monolayer V$_{2}$XN (X = P, As)
论文作者
论文摘要
具有易于磁化平面的二维（2D）XY磁铁支持非平凡的拓扑自旋纹理，其无耗散的传输非常需要2D Spintronic设备。在这里，我们预测带有正方形晶格的Janus Monolayer V $ _ {2} $ Xn（x = P，AS）是第一原理计算的2d-Xy Ferromagnets。磁晶的各向异性和磁性各向异性都有偏向于平面磁化，从而使Janus Monolayer v $ _ {2} $ xn的易于磁化$ xy $平面。在蒙特卡洛模拟上，我们观察到了单层中的berezinskii-kosterlitz- thouless（bkt）相变，v $ _ {2} $ xn具有过渡温度$ t _ {\ rm bkt} $在室温之上。尤其是，单层V $ _ {2} $ ASN的磁各向异性能量（MAE）为292.0 $ $ $ EV ATOM和A $ t _ {\ rm bkt} $的434 K，其大于单层V $ _ {2} $ PN的磁极。此外，单层v $ _ {2} $ xn的拉伸应力5 \％可以进一步改善$ t _ {\ rm bkt} $的$ 500 k。我们的结果表明，Janus Monolayer v $ _ {2} $ xn（x = p，x = p，as）是候选材料，可以实现候选材料，以实现高 - tymen的效果。
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 $T_{\rm BKT}$ being above the room temperature. Especially, monolayer V$_{2}$AsN has a magnetic anisotropy energy (MAE) of 292.0 $μ$eV per V atom and a $T_{\rm BKT}$ of 434 K, which is larger than that of monolayer V$_{2}$PN. Moreover, a tensile strain of 5\% can further improve the $T_{\rm BKT}$ 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.
