超导FeSe单层表面氟吸附的可控磁各向异性与铁弹性
Controllable magnetic anisotropy and ferroelasticity in superconducting FeSe monolayer with surface fluorine adsorption
AI总结：
通过密度泛函理论计算，发现氟吸附可调控FeSe单层的磁各向异性并引入多铁性，且磁性与铁弹性耦合，为自旋电子学器件提供平台。
摘要：
在原子级薄的二维磁体中实现可控磁化对于发展自旋电子学极具吸引力。对于FeSe单层，其磁性基态尚未被完全理解，其在构建高速和先进器件方面的潜力仍属未知。利用密度泛函理论计算，我们确认单层FeSe的自旋有序为二聚体织构。通过氟（F）吸附（F/FeSe），体系表现出依赖于覆盖度的磁各向异性和多铁性，这可归因于Jahn-Teller效应，有利于潜在的自旋电子学应用。有趣的是，我们提出在最能量有利的F/FeSe体系中存在磁性与铁弹性之间的内在耦合。因此，我们的研究不仅提供了一种控制自旋电子学性质和构建多铁材料的有效途径，而且使F/FeSe成为磁性研究和实用高性能多功能器件的理想平台。
英文摘要：
Controllable magnetization in atomically thin two-dimensional magnets is highly desirable for developing spintronics. For FeSe monolayer, its magnetic ground state is not yet fully understood, and the potential in constructing high-speed and advanced devices remains unknown. Using density functional theory calculations, we confirm the spin ordering of monolayer FeSe to be dimer texture. With Fluorine (F) adsorption (F/FeSe), the system exhibits a coverage dependent magnetic anisotropy and multiferroicity which can be attributable to the Jahn-Teller effect, being the benefit to potential spintronic applications. Intriguingly, an inherent coupling between magnetism and ferroelasticity in the most energetically favorable F/FeSe system is proposed. Our study thus not only provides a promising way to control the spintronic properties and construct multiferroics, but also renders F/FeSe an ideal platform for magnetism studies and practical high-performance multifunctional devices.
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