Magnetostatic spin wave resonance in square-patterned Ni_(0.77)Fe_(0.16)Cu_(0.05)Cr_(0.05) (Mu-metal) thinfilms

摘要

Behavior of spin waves was investigated in patterned Mu-metal thin film both theoretically and experimentally. The Mu-metal(111) thinfilms with 7 nm thickness were grown by thermal evaporation technique in high vacuum condition. X-ray diffraction measurements showed that the film has a highly FCC crystalline structure. Saturation magnetization and coercive field values of sample obtained from vibrating sample magnetometer are around 500 emu/cm~3 and 10 Oe respectively at room temperature. The patterns were square shaped and size of squares were changed between 40-80 μm. Theoretical model and computer program were developed for analyzing the FMR spectra. There is no magnetic anisotropy for in-plane and out-of-plane geometry by both theoretical and experimental investigations. Magnetostatic modes were observed for out-of-plane geometry and these modes were highly compatible with outputs of simulation model.