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Spin wave frequencies are observed in ultra-thin Fe/GaAs(100) films attemperatures where the spontaneous zero field magnetization is zero. The filmsexhibit good cyrstalline structure, and the effect of magnetic anisotropies isapparent even though no zero field spin wave energy gap exists. An analysis isgiven in terms of a superparamagnetic model in which the film is treated as anetwork of non-interacting single domain magnetic islands. A spin wave analysisprovides a means to separate measured values of anisotropy parameters fromproducts involving anisotropy and island volume. In this way, a measure of theactivation volume associated with superparamagnetic islands is obtained fordifferent Fe film thicknesses. Results suggest that the island lateral areaincreases with increasing film thickness

Measurement of spin waves and activation volumes in superparamagnetic Fe films on GaAs(100)