Abstract
The magnetic anisotropy induced by magnetic annealing was investigated for soft magnetic (Fe, Co)-Mg-O granular films prepared by the RF sputter-deposition method. A large uniaxial magnetic anisotropy (2 × 104 erg/cc) was found in the (Co.94Fe.06)64Mg15O21 film, whereas a small anisotropy (2 × 103 erg/cc) was observed in the Fe67Mg13O20 film. Following transverse annealing with a 90° rotation of the magnetic anisotropy, the directions of a uniaxial magnetic anisotropy can be switched almost reversibly to parallel the magnetic field direction. The uniaxial magnetic anisotropy decreases, disappears, and then reappears at the direction of the magnetic field. The results suggest that the induced magnetic anisotropy is not attributable to obvious micro-structural changes during film growth and annealing.
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