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Abstract
The anisotropy Ku at -183°C in iron-deficient Ni-Co ferrites cooled down from room temperature in magnetic field is observed. It increases rapidly with decreasing contents of Fe 2 O 3 and seems to attain a saturation value at a certain value of Fe 2 O 3 contents. It also increases approximately in proportion to Co concentration. The activation energy for this process is about 0.25 to 0.4 eV. This anisotropy has been explained in terms of the preferential occupation of Co 3+ ions in the four kinds of 16d sites arising from electron migration between Co 2+ and Co 3+ ions. The anisotropy Ku is not observed in iron deficient Mg-, Mn-, and Cu- ferrites containing a small amount of Co.
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