Stripe domain and enhanced resonance frequency in ferrite doped FeNi films

Abstract

Stripe domain (SD) structures of FeNi films were controlled by doping different concentrations of ferrite. With increasing concentration of doped ferrite, SD width decreases, which indicated that perpendicular magnetic anisotropy (H-perpendicular to) increases. SD disappears and bubble-like features are observed with doping ferrite at 32% due to large H-perpendicular to. The origin for the enhancement of H-perpendicular to is exchange coupling between ferrimagnet and ferromagnet. Moreover, different doping concentrations of ferrite realize an increase of resonant frequency from 1.3 to 2.3 GHz.