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Phys. Rev. B 56, 2617–2622 (1997)

[Issue 5 – 1 August 1997 ]

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Exchange and anisotropy effects on spin waves in epitaxial Co films

M. Grimsditch and Eric E. Fullerton

Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439

R. L. Stamps

Department of Physics and Lima Campus, Ohio State University, Columbus, Ohio 43210

Using Brillouin scattering we have investigated the effect of large in-plane anisotropy on magnetic excitations in b axis-oriented epitaxial 50-nm Co films. For in-plane fields along the easy axis the magnon frequencies increase monotonically with increasing field. For in-plane fields along the hard axis, nonmonotonic behavior is observed in which the surface to bulk spin-wave character of one magnon mode changes as a function of applied field. Although fits to the data based on a full theoretical treatment are consistent with parameters in the literature and with parameters extracted from the magnetization data, we show that uncertainties in crystal orientation (as small as 1°) can produce dramatic effects in the quantitative data interpretation.

©1997 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v56/p2617
DOI: 10.1103/PhysRevB.56.2617
PACS: 75.50.Cc, 75.70.Cn, 75.30.Ds, 78.35.+c

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