Intrinsic Coercivity of Substituted BaFe_<12>O_<19>

概要

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Intrinsic coercive force measurements were made on BaFe_<12>O_<19> 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 _iH_c, 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 H_a also contribute greatly to the abrupt rise of _iH_c. In the case of the other substitutions, the value of _iH_c decreased without an appreciable change in the single-domain critical size; this decrease might be due to the decrease in H_a.
社団法人応用物理学会の論文
1973-03-05