MAGNETIC ANISOTROPIES IN THICK BODY-CENTERED-CUBIC CO

Magnetic anisotropies of a 357-Angstrom-thick Co him in the bcc phase were examined using Brillouin light scattering. This film, one of the thickest known bcc Co structures, is found to have a fourfold magnetic anisotropy that is markedly different from those of thinner films. A large possibly strain-induced uniaxial anisotropy is also found. The f ilm is thick enough so that the surface and n=1 bulk magnon are within a few GHz of each other and strongly hybridize. Unusual behavior of t he scattering intensities suggest the possible presence of surface ani sotropies and/or inhomogeneous internal fields. (C) 1996 American Inst itute of Physics.