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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Phenomenological model of the magnetic states of ferromagnetic film with competing surface and bulk anisotropies
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Phenomenological model of the magnetic states of ferromagnetic film with competing surface and bulk anisotropies

机译：具有竞争表面和体各向异性的铁磁薄膜磁态的现象学模型。

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摘要

The magnetic properties of a film with competing surface and bulk anisotropies and nonuniform ferromagnetic exchange interaction between atomic layers in the surface region have been investigated. The analytic expressions for the criteria of stability of the perpendicular and in-plane states of a film of arbitrary thickness have been derived in the framework of the layer by layer approach. We find that in films characterized by an arbitrary layer-dependent ferromagnetic exchange interaction between atomic layers and layer-dependent an-isotropy constants, a canted noncollinear magnetic state becomes favorable when neither the perpendicular nor in-plane state is stable. We construct the diagram of the magnetic states of such a film and analyze the behavior of the magnetic state depending on film thickness. The developed theory can be applied to describe a wide class of quasi-two-dimensional magnetic systems demonstrating phase transitions between collinear and noncollinear magnetic states. In particular, we use this theory to describe the two-step spin-reorientation transition observed in bare Co/Au films.
机译：研究了具有各向异性的表面和体积各向异性以及在表面区域原子层之间存在不均匀的铁磁交换相互作用的薄膜的磁性。在逐层方法的框架内，得出了任意厚​​度的薄膜的垂直和面内状态稳定性标准的解析表达式。我们发现，在以原子层之间的任意层相关的铁磁交换相互作用和层相关的各向异性常数为特征的薄膜中，当垂直态和面内态都不稳定时，倾斜的非共线磁性态变得有利。我们构造了这种薄膜的磁态图，并根据薄膜厚度分析了磁态的行为。发达的理论可以用于描述一类准二维磁性系统，这些系统演示了共线和非共线磁态之间的相变。特别地，我们使用该理论来描述在裸露的Co / Au薄膜中观察到的两步自旋取向转变。

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