SPIN-WAVE HYBRIDIZATION AND MAGNETIC ANISOTROPIES IN A THICK BCC COBALT FILM

Magnetic anisotropies of a 357 Angstrom thick Co film were examined us ing Brillouin light scattering. The Co has bcc structure, and was foun d to have a significant fourfold anisotropy in addition to a strong un iaxial anisotropy. This film is one of the thickest bce to structures and we find that the surface and n=1 bulk spin waves have comparable f requencies and are strongly mixed. Unusual behavior of the scattering intensities suggest the possible presence of inhomogeneous internal fi elds that result in a different dependence for the bulk mode frequenci es on field orientation than for the surface mode.