Abstract Static and dynamic magnetic properties of a ferrimagnetic Fe ( 35 A ) / Gd ( 50 A ) 12 superlattice were investigated in a wide 4–300 K temperature range using magneto-optical Kerr effect (MOKE) and ferromagnetic resonance (FMR) techniques. The multilayer structure was sputtered on a transparent glass substrate which made it possible to perform MOKE measurements on both Fe and Gd terminated sides of the superlattice. These experiments allowed us to detect a transition between field-aligned and canted magnetic states on both sides of the film and to distinguish between the bulk and surface twisted phases of the superlattice. As a result, the experimental H - T magnetic phase diagram of the system was obtained. FMR studies at frequencies 7–36 GHz demonstrated a complex evolution of absorption spectra as temperature decreased from room down to 4 K. Two spectral branches were detected in the sample. Theoretical simulations show that the observed spectral branches correspond to different types of inhomogeneous resonance modes in the multilayer with non-uniform magnetization precession inside Gd layers.

中文翻译：

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Fe/Gd亚铁磁多层中的扭曲磁化状态和非均匀共振模式

摘要 使用磁光克尔效应 (MOKE) 和铁磁共振 (FMR) 技术在 4–300 K 的宽温度范围内研究了亚铁磁性 Fe ( 35 A ) / Gd ( 50 A ) 12 超晶格的静态和动态磁性。多层结构被溅射在透明玻璃基板上，这使得在超晶格的 Fe 和 Gd 终止侧进行 MOKE 测量成为可能。这些实验使我们能够检测到薄膜两侧场对齐和倾斜磁态之间的转变，并区分超晶格的体相和表面扭曲相。结果，得到了系统的实验H-T磁相图。频率为 7–36 GHz 的 FMR 研究表明，随着温度从室温降低到 4 K，吸收光谱发生了复杂的演变。在样品中检测到两个光谱分支。理论模拟表明，观察到的光谱分支对应于多层中不同类型的非均匀共振模式，在 Gd 层内具有非均匀磁化进动。