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首页> 外文期刊>Journal of Experimental and Theoretical Physics >Kinetics of Magnetization Reversal in a Heterophase Nanomagnet with Spatially Modulated Anisotropy
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Kinetics of Magnetization Reversal in a Heterophase Nanomagnet with Spatially Modulated Anisotropy

机译：具有空间调制各向异性的异相纳米磁体中磁化反转的动力学

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摘要

Magnetization reversal modes in a thin-film NiFeCuMo ferromagnet (FM) with periodically varying in-plane anisotropy are studied by the magneto-optical indicator film (MOIF) technique. The unidirectional anisotropy in FM regions exchange-coupled to a FeMn antiferromagnet (AFM) film in the form of square mesh stripes is alternated by the uniaxial anisotropy in the FM regions inside this mesh. It is shown that the boundaries formed along the edges of these stripes, which separate FM regions with different anisotropy, crucially influence the kinetics of domain-structure transformation in both types of FM regions. It is established that the lateral exchange anisotropy in the ferromagnet, which is determined by the stabilization of the spin distribution in the FM layer along the FM-(FM/AFM) interface, leads to the asymmetry of the magnetization reversal in FM regions bordered with an FM/AFM structure. Anisotropy of the mobility of 180-degree "charged" and "uncharged" domain walls situated, respectively, perpendicular and parallel to the unidirectional anisotropy axis is revealed. The difference observed between the mobilities of charged and uncharged domain walls is attributed to the difference in the spin distribution in these walls with respect to the unidirectional anisotropy axis and is a key factor for the difference between the magnetization reversal kinetics in horizontal and vertical exchange-biased FM stripes. Drastic differences are revealed in the asymmetry of magnetization reversal processes in mutually perpendicular narrow stripes of FM/AFM structures. Possible mechanisms of magnetization reversal in low-dimensional FM-(FM/AFM) heterostructures are discussed with regard to the effect of domain walls localized on the edges of AFM layers.
机译：利用磁光指示膜（MOIF）技术研究了具有周期性变化的面内各向异性的薄膜NiFeCuMo铁磁体（FM）中的磁化反转模式。交换耦合到方形网状条纹形式的FeMn反铁磁体（AFM）膜的FM区域中的单向各向异性被该网格内部FM区域中的单轴各向异性所交替。结果表明，沿着这些条纹的边缘形成的边界将具有不同各向异性的FM区分开，对两种类型的FM区中的畴结构转变动力学都产生了至关重要的影响。可以确定的是，铁磁体中的横向交换各向异性是由FM层沿FM-（FM / AFM）界面的自旋分布的稳定所决定的，从而导致在以FM为边界的FM区域中磁化反转的不对称性。 FM / AFM结构。揭示了分别位于与单向各向异性轴垂直和平行的180度“带电”和“不带电”畴壁的迁移率的各向异性。在带电和不带电畴壁的迁移率之间观察到的差异归因于这些壁相对于单向各向异性轴的自旋分布的差异，并且是水平和垂直交换中磁化反转动力学之间差异的关键因素，偏向FM条纹。在相互垂直的FM / AFM结构窄条中，磁化反转过程的不对称性显示出巨大的差异。关于位于AFM层边缘的畴壁的影响，讨论了低维FM-（FM / AFM）异质结构中磁化反转的可能机制。

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