Excellent soft magnetic properties have been achieved for Co-Cr-O granular films with nanoscaled grains of Co distributed in the amorphous intergranular regions of Cr2O3. A rapid decrease in coercivity has been observed with decreasing the volume fraction of Co. This rapid decrease in coercivity is attributed to the reduction in size D of Co grains, and follows the D6-power law of the random anisotropy model for nanocrystalline materials. The minimum coercivity value of 0.39 Oe is obtained at 75.5 volume % of Co without post annealing. The saturation magnetization, in-plane anisotropy field, FMR frequency, and permeability at 1 GHz are 11.8 kG, 80 Oe, 2.94 GHz, and 141, respectively. Hence, Co-Cr-O granular films can be used in the high frequency devices operated over 2 GHz.
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Morikawa et al. (1999) studied this question.
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