We demonstrate the manipulation of magnetic phases in FeRh thin films through atomic displacements and the distribution of structural defects. Atomic scale disorder can be controlled via irradiation with light noble gas ions, producing depth-varying nanoscale phase configurations of distinct antiferromagnetic, ferromagnetic, and paramagnetic regions. Here, we perform a spatial characterization of the magnetic phases and the local magnetic environment around the Fe atoms, as well as the variation of the open-volumes around atomic sites. Thus, a direct correspondence between the existence of the three magnetic phases and lattice defects is revealed. By careful selection of the irradiating fluence, we show that it is possible to produce simple and thermally stable magnetic configurations, such as uniform magnetization or a bilayer phase structure. Furthermore, the thin film surface and interfaces are observed as the nucleation sites for the transitions between the phases. These results demonstrate a sensitive nanoscale manipulation of magnetic properties, shedding light on magnetic ordering in alloy lattices and broadening the scope for applications.

中文翻译：

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FeRh薄膜中深度选择性磁相共存

我们展示了通过原子位移和结构缺陷分布对 FeRh 薄膜中磁相的操纵。原子尺度无序可以通过用轻惰性气体离子照射来控制，产生不同反铁磁、铁磁和顺磁区域的深度变化的纳米级相配置。在这里，我们对 Fe 原子周围的磁相和局部磁环境进行了空间表征，以及原子位点周围开放体积的变化。因此，揭示了三个磁相的存在与晶格缺陷之间的直接对应关系。通过仔细选择辐照通量，我们表明可以产生简单且热稳定的磁性配置，例如均匀磁化或双层相结构。此外，薄膜表面和界面被观察为相之间转变的成核位点。这些结果证明了对磁性的敏感纳米级操纵，揭示了合金晶格中的磁性排序并拓宽了应用范围。