Static and dynamic magnetic properties of Fe_(20)Ni_(80) and Co_(20)Fe_(60)B_(20) material-modulated stripe-patterned thin films

摘要

Material-modulated (Fe_(20)Ni_(80) and Co_(20)Fe_(60)B_(20)) stripe-patterned thin films were fabricated on naturally oxidized silicon substrates by radio frequency magnetron sputtering method. The static and dynamic magnetic properties of the samples were studied by magneto-optical Kerr microscopy and vector network analyzer, respectively. Hysteresis loops and magneto-optical Kerr microscopy images show multistep magnetization reversal processes, which can be explained by the asynchronous magnetization reversal of different stripes. The permeability spectra indicate the presence of two resonance peaks whose frequencies shift with the change of the stripe width. Meanwhile, the interval between two resonance frequencies is larger than 1.5 GHz for all samples. This is an excellent candidate material to design microwave devices.