NiO-Fe纳米结构中反铁磁涡旋态的 imprinting 效应
Imprinting of Antiferromagnetic Vortex States in NiO-Fe Nanostructures
AI总结：
本研究结合实验与理论，在NiO(111)-Fe(110)双层纳米结构中实现铁磁涡旋向反铁磁体的 imprinting，通过微磁模拟构建相图并揭示界面交换耦合与磁各向异性的作用机制。
摘要：
磁涡旋是铁磁体中常见的拓扑自旋结构，但在反铁磁体中尚属新发现。结合实验与理论研究，我们证明在纳米结构的反铁磁-铁磁NiO(111)-Fe(110)双层膜中，磁涡旋可通过铁磁体的静磁相互作用自然稳定，并通过界面交换耦合 imprinting 到相邻的反铁磁体中。我们利用微磁模拟构建了 imprinted 反铁磁涡旋态稳定性的对应相图。深入分析表明，界面交换耦合与反铁磁磁各向异性的相互作用，在使典型面内反铁磁NiO中的奈耳矢量局域重取向为面外方向、从而稳定反铁磁体中涡旋的过程中发挥关键作用。
英文摘要：
Magnetic vortices are topological spin structures frequently found in ferromagnets, yet novel to antiferromagnets. By combining experiment and theory, we demonstrate that in a nanostructured antiferromagnetic-ferromagnetic NiO(111)-Fe(110) bilayer, a magnetic vortex is naturally stabilized by magnetostatic interactions in the ferromagnet and is imprinted onto the adjacent antiferromagnet via interface exchange coupling. We use micromagnetic simulations to construct a corresponding phase diagram of the stability of the imprinted antiferromagnetic vortex state. Our in depth analysis reveals that the interplay between interface exchange coupling and the antiferromagnet magnetic anisotropy plays a crucial role in locally reorienting the Néel vector out-of-plane in the prototypical in-plane antiferromagnet NiO and thereby stabilizing the vortices in the antiferromagnet.
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