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Optimization of Ferromagnetic Resonance Spectra Measuring Procedure for Accurate Gilbert Damping Parameter in Magnetic Thin Films Using a Vector Network Analyzer |
Journal of Magnetics, Volume 16, Number 3, 30 Sep 2011, Pages 206-210 |
D.-H. Kim (Department of Physics, Inha University), H.-H. Kim (Department of Physics, Inha University), Chun-Yeol You * (Department of Physics, Inha University), Hyungsuk Kim * (Department of Electrical Engineering, Kwangwoon University) |
Abstract |
We optimize a vector network analyzer ferromagnetic resonance (VNA-FMR) measurement system to study spin dynamics and Gilbert damping parameters of thin ferromagnetic films. In order to obtain accurate damping parameters, careful determination of the susceptibility line-width is required. The measured S-parameters are converted into the corresponding susceptibility through a calibration processes. From the line-width measurements, we can successfully extract the saturation magnetizations and Gilbert damping parameters of 5-, 8-, and 10-nm thick Ni81Fe19 (Py) films. |
Keywords: Gilbert damping parameter; vector network analyzer; Kittel’s equation; susceptibility |
DOI: http://dx.doi.org/10.4283/JMAG.2011.16.3.206 |
Full Text: PDF |
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