Temperature dependent magnetostatic and dynamic properties of soft magnetic FeGaB/Al2O3 thin films for microwave applications

Abstract

Iron Gallium Boron (FeGaB) thin film is one of the low-loss self-biased soft magnetic films. In this report, the temperature dependent magnetostatic and dynamic properties of FeGaB/Al2O3 composite soft magnetic thin films were studied. The analysis of surface roughness, crystal orientation and magnetostatic properties indicate that the grain size and anisotropy of the thin film increase after annealing which temperature is from 573 K to 773 K. The ferromagnetic resonance spectra of different annealed thin films suggest the damping factor, linewidth and resonance magnetic fields all increase with the increased annealing temperature, which is attributed to the change of film crystallization. Moreover, the angle dependent anisotropic magnetoresistance and planar Hall effect show the percentage of magnetoresistance change increased due to the high annealing temperature.