Buznikov Nikita A, Lagarkov Andrey N, Maklakov Sergey A, Maklakov Sergey S, Osipov Alexey V, Rozanov Konstantin N, Zezyulina Polina A
Institute for Theoretical and Applied Electromagnetics, Russian Academy of Sciences, Moscow 125412, Russia.
Sensors (Basel). 2024 Sep 24;24(19):6165. doi: 10.3390/s24196165.
Changes in the microwave permeability of permalloy films with an increase in the film thickness are studied. Measurement data on the evolution of microwave permeability with film thickness are analyzed in the framework of a model for the film with a regular stripe domain structure and out-of-plane magnetic anisotropy. A correlation between the microwave magnetic properties and magnetic structure of permalloy films is established. It is demonstrated that the observed decrease in the ferromagnetic resonance frequency and the static permeability with a growth in the film thickness can ascribed to the appearance of perpendicular anisotropy and the formation of a stripe domain structure. The calculated dependences of the ferromagnetic resonance frequency and static permeability on the film thickness are in reasonable agreement with the measurement results. Based on the analysis of these dependences, the domain width in the permalloy films is estimated. It is found that for thick permalloy films, the domain width is of the order of the film thickness. The results obtained may be useful for high-frequency applications of soft magnetic films.
研究了坡莫合金薄膜的微波磁导率随薄膜厚度增加的变化情况。在具有规则条纹畴结构和面外磁各向异性的薄膜模型框架内，分析了微波磁导率随薄膜厚度变化的测量数据。建立了坡莫合金薄膜的微波磁性能与磁结构之间的相关性。结果表明，随着薄膜厚度的增加，观察到的铁磁共振频率和静态磁导率的降低可归因于垂直各向异性的出现和条纹畴结构的形成。计算得到的铁磁共振频率和静态磁导率对薄膜厚度的依赖关系与测量结果合理吻合。基于对这些依赖关系的分析，估算了坡莫合金薄膜中的畴宽度。发现对于厚坡莫合金薄膜，畴宽度约为薄膜厚度。所得结果可能对软磁薄膜的高频应用有用。
