Theory of highly anisotropic ferromagnets. II. Renormalization of magnon energies in the heavy rare earths

For pt.I see abstr. A24581 of 1973. Magnon energies, renormalized in a Hartree-Foch approximation, have been derived. The model includes isotropic and anisotropic exchange interactions, a crystal field of HCP symmetry, magnetoelastic interactions and dipolar interactions. The novel feature of the theory is a modification of magnon renormalization by the ellipticity of spin precession that is a characteristic of highly anisotropic ferromagnets.