Anisotropy of the Intrinsic Domain Magnetization of a Ferromagnet

The effect of pseudodipolar coupling on the intrinsic domain magnetization of a cubic ferromagnet at low temperatures is investigated. Besides the anisotropy in the magnetization resulting from the dependence of the thermal excitation of spin waves on magnetization direction in the crystal, the pseudodipolar coupling is capable of making an anisotropic contribution to the magnetization, even at $T=0\mathrm{}°$K, in the same approximation as its contribution to the first order anisotropy constant $K_1$. Both effects are calculated and found to be in opposition to one another, tending to cancel in nickel at about 7.5°K.