On the Origin of Magnetic Anisotropy Induced by Magnetic Annealing

The magnitude of magnetic anisotropy induced by the magnetic annealing was measured as a function of composition for iron-nickel alloys. It is concluded that the magnitude of the anisotropy is proportional neither to the magnetostriction nor to the saturation magnetization. The origin of this anisotropy, therefore, can be explained neither by the theory of " strain of directional order " nor by the theory of " elongated order phase ". The result can be consistently explained by the dipole. dipole interaction in directionally ordered arrangement of atoms. The result is compared with Néel's formulas.