Abstract
Intrinsic coercive force measurements were made on BaFe12O19 in which certain amounts of Fe were substituted by In, Cr, Al, Ga, ZnGe, ZnV, ZnNb or ZnTa. The specimens were prepared by the ordinary powder metallurgy method. X-ray diffraction of the specimens indicated only the presence of the magnetoplumbite phase within the experimental substitution range. A large increase in coercive force iHc, observed when Cr, Al or Ga were substituted, was mainly due to the onset or the approach of single-domain behaviour at higher concentrations even under the same milling condition. In the case of Al substitution, the increase of magnetocrystalline anisotropy field Ha also contribute greatly to the abrupt rise of iHc. In the case of the other substitutions, the value of iHc decreased without an appreciable change in the single-domain critical size; this decrease might be due to the decrease in Ha.
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