一个新的Skyrmion拓过渡驱动由高阶交换相互作用在Janus MnSeTeTe
Megha Arya1, Moritz A Goerzen1, Lionel Calmels1
1CEMES, Université de Toulouse, CNRS, 29 rue Jeanne Marvig, F-31055 Toulouse, France.
高级交换相互作用在二维磁体中诱导了一种新的"铁过渡",令人惊的是,这并没有影响斯基尔米安稳定性,而是修改了布洛赫点. 由于强烈的Dzyaloshinskii-Moriya相互作用,Janus MnSeTe显示了高的 skyrmion 能量障碍.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 这就是Spintronics.
背景情况:
- 二维 (2D) 范德瓦尔斯磁铁是推进天体技术的关键.
- 了解Dzyaloshinskii-Moriya相互作用 (DMI) 对于 skyrmion 的形成,稳定性和过渡至关重要.
- 高阶交换相互作用 (HOI) 对2D材料中的这些现象的影响在很大程度上是未知的.
研究的目的:
- 调查HOI对2D磁铁中的 skyrmion稳定性,崩和拓过渡的影响.
- 发现由HOI驱动的新型拓过渡.
- 描述单层MnSeTe和Janus MnSeTe在 skyrmion应用中的特性.
主要方法:
- 第一原则计算.第一原则计算.
- 原子自旋模拟. 原子自旋模拟.
- 对拓过渡和能源障碍的分析.
主要成果:
- 一个新的拓过渡,称为"铁过渡",由单层MnSeTe.Te中的HOI驱动.
- 由于DMI占主导地位,Skyrmion的稳定性和崩受到HOI的最小影响.
- HOI强烈修改了布洛赫点,导致了新的铁路过渡.
- 贾努斯MnSeTe表现出高斯基米安能量障碍,归因于强大的DMI.
结论:
- HOI可以在2D磁铁中诱导新的拓过渡,而不会显著改变 skyrmion 稳定性.
- 在点附近的 skyrmion 稳定性和崩机制中,DMI 起着主导作用.
- 由于其强大的DMI和高能障碍,Janus MnSeTe是高性能斯基米安基设备的有前途材料.
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