Magnetic Anisotropy of Fe–Al Alloys

抄録

Magnetocrystalline anisotropy K₁ and induced magnetic anisotropy Ku of Fe–Al single crystals containing about 20 at. % Al were measured with a torque meter. The K₁ of the 21.0 at. % Al alloy showed negative magnetic field dependence in high field, and the value of K₁ showed a maximum at 360 K. The behavior of K₁ is explained on the basis that a specimen is in a two-phase state, one of which is disordered matrix having positive K₁ and the other is precipitated Fe₃Al phase having negative K₁. The deviation of Ku from directional order theory is explained by assuming that the shape anisotropy of Fe₃Al particles plays an important role.