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Vector Network Analyzer를 이용한 Py 박막의 강자성공명연구
신용확(Yong-Hwack Shin),하승석(Seung-Seok Ha),김덕호(Duck-Ho Kim),유천열(Chun-Yeol You) 한국자기학회 2010 韓國磁氣學會誌 Vol.20 No.1
Ferromagnetic resonance (FMR) measurement is an important experimental technique for the study of magnetic dynamics. We designed and set up the vector network analyzer ferromagnetic resonance (VNA-FMR) measurement system with home made coplanar waveguides (CPW). We examined 10-, 20-, 40-㎚ thick Py thin films to test the performance of the VNA-FMR measurement system. We measured S-parameter (transmission/reflection coefficient) of Py thin films on a CPW. Resonance frequency is investigated from 2.5 to 7 ㎓ for a field range from 0 to 490 Oe. The VNA-FMR data shows the resonance frequency increment when the external magnetic field increases. We also investigated Gilbert damping constant of Py thin film using resonance frequency (w<SUB>r</SUB>) and linewidth (Δ<SUB>w</SUB>). After investigating dependence of thickness, we find that an decrease in S-parameter intensity as Py thin film thickness decreases. And the FMR results show that the effective saturation magnetization, M<SUB>eff</SUB>, increase from 7.205(± 0.013) kOe to 7.840(± 0.014) kOe, while the film thickness varies from 10 to 40 ㎚.