高抵抗軟磁性Fe-Al-Oグラニュラー膜の磁気異方性

概要

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Investigation of the uniaxial magnetic anisotropy of high-resistivity Fe-Al-O granular films prepared by sputtering showed that applicatin of an external dc field during film deposition and post-annealing treatments had no serious effect on the magnetic anisotropy.In contrast, the incident angle of the sputtered particles to the substrate greatly affected the strength and direction of the anisotropy.These results suggest that the magnetic anisotropy is induced by shape anisotropy.However, the temperature dependence of the anisotropy constant does not obey the usual shape anisotropy relationship K_u(T)^∝ M^2_S(T).We propose an anisotopic coupling model in order to explain the uniaxial anisotropy found in these granular films.This model satisfactorily explains the temperature dependence of K_u(T) and M_s(T) for all Fe-Al-O granular films prepared in the present experiment.The agreement between the experiments and the theory implies that the magnetic aisotropy of the granular films is strongly influenced by the magnetism and spatial distribution of the low-T_c intergranular phase.
社団法人日本磁気学会の論文
1998-04-15