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Phys. Rev. B 52, 10194–10201 (1995)

[Issue 14 – 1 October 1995 ]

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Magnetic anisotropies in body-centered-cubic cobalt films

S. Subramanian, X. Liu, R. L. Stamps, and R. Sooryakumar

Department of Physics, The Ohio State University, Columbus, Ohio 43210

G. A. Prinz

Naval Research Laboratory, Washington, D.C. 20375

The origin of magnetic anisotropies in thin bcc cobalt films is investigated using Brillouin light scattering. The in-plane directional and wave-vector dependence of surface and bulk magnon frequencies in (110) and (001) oriented films indicate a twofold anisotropy in these cubic ferromagnets with the easy axis of magnetization lying in plane along [001] and [100], respectively. Using elastic constants determined from phonon dispersion measurements, we argue that the observed uniaxial anisotropy can be largely accounted for by magnetoelastic interactions driven by lattice mismatch at the film/substrate interface. The easy axis is also evident by the transformation of the surface spin wave into the n=0 bulk magnon when the magnon wave vector lies parallel to the spontaneous (easy) axis of magnetization.

©1995 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v52/p10194
DOI: 10.1103/PhysRevB.52.10194
PACS: 62.20.Dc, 78.35.+c, 75.30.Ds

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