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Inelastic scattering of low-energy electrons off Fe(100) surfaces shows a strong spin dependent energy loss feature in the range of 100--350 meV due to the excitation of spin waves. The highly asymmetric line shape is attributed to the excitation of a continuum of bulk spin waves due to nonconservation of perpendicular momentum in the scattering process.
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Vernoy et al. (2003) studied this question.
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