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首页> 外文期刊>Physical review >Radiative damping in waveguide-based ferromagnetic resonance measured via analysis of perpendicular standing spin waves in sputtered permalloy films
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Radiative damping in waveguide-based ferromagnetic resonance measured via analysis of perpendicular standing spin waves in sputtered permalloy films

机译:通过分析溅射的坡莫合金薄膜中的垂直驻波,测量了基于波导的铁磁共振中的辐射阻尼

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摘要

The damping a of the spin-wave resonances in 75, 120, and 200 nm thick permalloy films is measured via vector-network-analyzer ferromagnetic resonance (VNA-FMR) in the out-of-plane geometry. Inductive coupling between the sample and the waveguide leads to an additional radiative damping term. The radiative contribution to the over-all damping is determined by measuring perpendicular standing spin waves (PSSWs) in the permalloy films, and the results are compared to a simple analytical model. The damping of the PSSWs can be fully explained by three contributions to the damping: the intrinsic damping, the eddy-current damping, and the radiative damping. It was not necessary to invoke any additional damping contributions to explain the data. Furthermore, a method to determine the radiative damping in FMR measurements with a single resonance is suggested.
机译:通过面外几何结构中的矢量网络分析仪铁磁共振(VNA-FMR)测量75、120和200 nm厚坡莫合金膜中自旋波共振的阻尼a。样品和波导之间的电感耦合导致附加的辐射阻尼项。通过测量坡莫合金膜中的垂直驻波(PSSW)来确定辐射对整体阻尼的贡献,并将结果与​​简单的分析模型进行比较。 PSSW的阻尼可以通过对阻尼的三个贡献来完全解释:固有阻尼,涡流阻尼和辐射阻尼。无需调用任何其他的阻尼贡献来解释数据。此外,提出了一种用于确定具有单共振的FMR测量中的辐射阻尼的方法。

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