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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Top-down control of dynamic anisotropy in permalloy thin films with stripe domains
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Top-down control of dynamic anisotropy in permalloy thin films with stripe domains

机译：自上而下控制带磁畴的坡莫合金薄膜的动态各向异性

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摘要

Permalloy films with different thickness were prepared for comparison, and the dynamic properties of the stripe domains were investigated by using a vector network analyzer ferromagnetic resonance (VNA-FMR) technique. A top-down approach was used to control the thickness of the films. In the measurement of permeability spectra, an applied magnetic field H-app was employed parallel and perpendicular to the stripe domains, respectively. Dynamic pseudo-uniaxial anisotropy fields are derived. In order to explain the anisotropy variation of permalloy films, a theoretical model has been proposed, and the result shows that the pseudo-uniaxial anisotropy can be attributed to the contributions of saturation magnetization, exchange interaction, perpendicular anisotropy, and film thickness. In addition, with the increase of Happ, the stripe domains gradually rotate towards the direction of the applied field, which can be clearly observed by magnetic force microscopy. Moreover, the dynamic permeability spectra exhibit a rhythmic variation dependent on the rotation of the stripe domains, i.e. the relationship between the rotational stripe domains and resonance frequency.
机译：制备了具有不同厚度的坡莫合金膜用于比较，并使用矢量网络分析仪铁磁共振（VNA-FMR）技术研究了条纹区域的动态特性。使用自顶向下的方法来控制薄膜的厚度。在磁导率谱的测量中，分别施加平行于和垂直于条纹区域的施加的磁场H-app。推导了动态伪单轴各向异性场。为了解释坡莫合金膜的各向异性变化，提出了一个理论模型，结果表明拟单轴各向异性可以归因于饱和磁化强度，交换相互作用，垂直各向异性和膜厚度的影响。此外，随着Happ的增加，条带区域逐渐向外加磁场方向旋转，这可以通过磁力显微镜清楚地观察到。此外，动态磁导率谱表现出取决于条带域的旋转的节奏变化，即，条带域的旋转与共振频率之间的关系。

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