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首页> 外文期刊>Physical review >Magnetization dynamics in interlayer exchange-coupled in-plane/out-of-plane anisotropy bilayers
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Magnetization dynamics in interlayer exchange-coupled in-plane/out-of-plane anisotropy bilayers

机译：层间交换耦合面内/面外各向异性双层中的磁化动力学

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摘要

The static and high-frequency properties of bilayer systems consisting in a single-crystal garnet film with a perpendicular anisotropy exchange coupled with a thin Permalloy film with a small in-plane anisotropy have been investigated both numerically and experimentally. The dynamic susceptibility spectra computed by means of two-dimensional micromagnetic simulations extended to stratified films reveal clearly the existence of multiple resonance lines resulting from the coupling between different magnetic area (domain walls, domains) inside the garnet film and the Permalloy film. In particular, exaltation of intensive domain wall resonances occurs within the frequency range including the uniform gyromagnetic mode of the Permalloy film. The effect of the garnet and Permalloy film thicknesses on the features of the dynamic susceptibility spectra is then studied. The experimental power absorption spectra recorded on a Permalloy/YIGBiLuAl-like bilayer exhibit well-defined resonance lines, most of them assigned to coupled modes of the bilayer nicely predicted by the micromagnetic simulations. The strong direct exchange coupling at the interface between the two layers appears as a predominant factor for this metal-oxide system.
机译：数值和实验研究了双层系统的静态和高频特性，该双层系统由具有垂直各向异性交换的单晶石榴石膜与具有较小面内各向异性的坡莫合金薄膜构成。通过二维微磁模拟扩展到分层膜的动态磁化率谱清楚地揭示了石榴石膜和坡莫合金膜内部不同磁性区域（畴壁，畴）之间耦合产生的多个共振线。特别地，在包括坡莫合金膜的均匀旋磁模式的频率范围内，发生高强度畴壁共振。然后研究了石榴石和坡莫合金膜的厚度对动态磁化率谱特征的影响。记录在类似坡莫合金/ YIGBiLuAlAl的双层上的实验功率吸收谱显示出清晰的共振线，其中大多数被分配给了双层耦合模式，通过微磁模拟可以很好地预测。在两层之间的界面处的强直接交换耦合似乎是该金属氧化物系统的主要因素。

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