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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Inductive and magneto-resistive measurements of Gilbert damping in Ni81Fe19 thin films and microstructures
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Inductive and magneto-resistive measurements of Gilbert damping in Ni81Fe19 thin films and microstructures

机译:Ni81Fe19薄膜和微结构中吉尔伯特阻尼的电感和磁阻测量

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摘要

We study time resolved precessional magnetization dynamics of permalloy (Ni81Fe19) thin films by time resolved detection of the anisotropic magneto-resistance (AMR) and by pulsed inductive microwave magnetometry (PIMM). AMR experiments are performed on microstructured permalloy discs of 4 μm diameter. PIMM experiments are performed on unpatterned macroscopic thin films of the same material. The magnetization dynamics observed by AMR can be well described by mainly single domain precession neglecting spin wave excitations. In contrast PIMM experiments on macroscopic samples show evidence of multiple precessional modes which cannot be described by a single Gilbert damping parameter. Consequences of the measurement of the intrinsic Gilbert damping parameter by the two methods are discussed.
机译:我们通过时间分辨各向异性磁阻(AMR)的检测和脉冲感应微波磁法(PIMM)研究了坡莫合金(Ni81Fe19)薄膜的时间分辨进动磁化动力学。 AMR实验是在直径为4μm的微结构坡莫合金圆盘上进行的。 PIMM实验是在相同材料的无图案宏观薄膜上进行的。通过AMR观测到的磁化动力学可以很好地描述为主要是单畴旋进而忽略了自旋波激发。相比之下,在宏观样本上进行的PIMM实验显示了多种进动模式的证据,这些模式无法用单个吉尔伯特阻尼参数来描述。讨论了两种方法测量固有吉尔伯特阻尼参数的后果。

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