Abstract
Mössbauer spectroscopy is used to extract depth sensitive information near the surface of an Fe film in Fe/MnF2 bilayers. We find that the hyperfine field at the surface has a quasilinear temperature dependence. For layers deeper into the film, the quasilinear temperature dependence diminishes and deep enough into the films, the hyperfine field goes like T3/2 as expected for bulk. We interpret this behavior as evidence of surface spin wave modes created by a perpendicular surface anisotropy, as previously predicted.
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