Abstract An investigation of the dependence of magnetic properties on the thickness of ferromagnetic films was completed. The study dealt with magnetostatic and microwave measurements of single-layer films of ferromagnetic metals (Fe, Co) and was aimed at revealing reasons for the deterioration of microwave magnetic performance with an increase in film thickness. Two types of variation of microwave permeability with the film thickness were distinguished for the films under study. One exhibited a noticeable deviation from maximal values and was observed for Co. The other case involved a gradual worsening of performance, and was observed for Fe. In the first case, the resonance frequency shifted lower when the film was thicker than 0.2–0.4 μm, and Acher’s coefficient fell by the factor of three. In the second case, the microwave performance worsened gradually, and a decrease of Acher’s coefficient was not large, approximately by 20%. The data analysis showed that the reason for the deterioration is an increase of out-of-plane anisotropy in the first case and sufficient growth of damping factor in the second case.

中文翻译：

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铁磁金属薄膜微波磁特性随膜厚的变化

摘要 完成了磁性能对铁磁薄膜厚度依赖性的研究。该研究涉及铁磁金属（Fe、Co）单层薄膜的静磁和微波测量，旨在揭示随着薄膜厚度的增加微波磁性能恶化的原因。对于所研究的薄膜，区分了两种类型的微波渗透率随薄膜厚度的变化。一个表现出与最大值的明显偏差，观察到 Co。另一种情况涉及性能逐渐恶化，观察到 Fe。在第一种情况下，当薄膜厚度超过 0.2-0.4 μm 时，共振频率移动得更低，并且 Acher 系数下降了三倍。在第二种情况下，微波性能逐渐变差，Acher系数的下降幅度不大，约为20%。数据分析表明，恶化的原因是第一种情况下面外各向异性的增加和第二种情况下阻尼因子的充分增长。