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Disorder-induced domain wall velocity shift at high fields in perpendicularly magnetized thin films

机译:垂直磁化薄膜中高场的无序诱导畴壁速度移动

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摘要

Domain wall dynamics in a perpendicularly magnetized system is studied by means of micromagnetic simulations in which disorder is introduced as a dispersion of both the easy-axis orientation and the anisotropy constant over regions reproducing a granular structure of the material. High field dynamics show a linear velocity-field relationship and an additional grain size dependent velocity shift, weakly dependent on both applied field and intrinsic Gilbert's damping parameter. We find the origin of this velocity shift in the nonhomogeneous in-plane effective field generated by the tilting of anisotropy easy axis introduced by disorder. We show that a one-dimensional analytical approach cannot predict the observed velocities and we augment it with the additional dissipation of energy arising from internal domain wall dynamics triggered by disorder. This way we prove that the main cause of higher velocity is the ability of the domain wall to irradiate energy into the domains, acquired with a precise feature of disorder.
机译:通过微磁模拟研究了垂直磁化系统中的畴壁动力学,其中引入了无序现象,即易轴取向和各向异性常数在材料重现颗粒结构的区域上的分散。高场动力学显示出线性的速度-场关系,以及依赖于晶粒尺寸的附加速度变化,这与所施加的场和固有的吉尔伯特的阻尼参数无关。我们在由紊乱引入的各向异性易轴的倾斜产生的非均匀面内有效场中找到了这种速度偏移的起源。我们表明,一维分析方法无法预测观察到的速度,并且通过由因无序触发的内部畴壁动力学引起的额外能量消散来增强它。通过这种方式,我们证明了更高速度的主要原因是畴壁将能量辐射到畴中的能力,这是由无序的精确特征所获得的。

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  • 来源
    《Physical review》 |2016年第17期|174438.1-174438.10|共10页
  • 作者单位

    Departamento de Fisica Aplicada, Universidad de Salamanca, Plaza de la Merced s, 37008 Salamanca, Spain;

    Departamento de Fisica Aplicada, Universidad de Salamanca, Plaza de la Merced s, 37008 Salamanca, Spain;

    Departamento de Fisica Aplicada, Universidad de Salamanca, Plaza de la Merced s, 37008 Salamanca, Spain;

    Departamento de Fisica Aplicada, Universidad de Salamanca, Plaza de la Merced s, 37008 Salamanca, Spain;

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