Abstract
Rotational hysteresis loss analysis is carried out for MP tapes in order to evaluate the magnitude of the magnetic anisotropy of metal particles and to clarify the effect of the degree of preferred particle orientation on their magnetic properties. Taking account of magnetostatic interactions among particles, it is shown that the mean value of the magnetic anisotropy of metal particles is 7.7 kOe. Furthermore, it is considered that the mean value of the saturation magnetization inside the particles is about 1270 emu/cc. The ratio of Hk(2θ) to Hkptc is the key to evaluating the degree of the preferred particle orientation. Here, Hk(2θ) is defined as the macroscopic anisotropy field, which is equivalent to the macroscoplc uniaxial magnetic anisotropy in the tape plane. Correlations between Hk(2θ)/Hkptc and the squareness of magnetization curve, coercive force, and remanent coercive force are established.
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