Twisted magnetization states and inhomogeneous resonance modes in a Fe/Gd ferrimagnetic multilayer
Twisted magnetization states and inhomogeneous resonance modes in a Fe/Gd ferrimagnetic multilayer
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DOI：
10.1016/j.jmmm.2018.12.022
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发表时间：
2019-04-01
影响因子：
2.7
通讯作者：
Ustinov, V. V.
中科院分区：
文献类型：
--
作者：
Drovosekov, A. B.;Savitsky, A. O.;Ustinov, V. V.
利用磁光克尔效应（MOKE）和铁磁共振（FMR）技术研究了铁磁[Fe（35埃）/Gd（50埃）]（12）超晶格在4-300 K宽温度范围内的静态和动态磁性能。多层结构溅射在透明玻璃衬底上，这使得在超晶格的Fe和Gd端端进行MOKE测量成为可能。这些实验使我们能够检测到薄膜两侧的场对准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。得到了系统的实验H - T磁相图。7-36 GHz频率的FMR研究表明，当温度从室温降低到4 K时，吸收光谱的复杂演变。在样品中检测到两个光谱分支。理论模拟结果表明，Gd层内磁化进动不均匀，所观测到的谱分支对应于不同类型的非均匀共振模式。
Static and dynamic magnetic properties of a ferrimagnetic [Fe(35 angstrom)/Gd(50 angstrom)](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.