Abstract
Using a recently developed Green's function formalism, we havecalculated the spin-wave spectra and dispersions in Ni and Fe. ForNi(100), the dispersion exhibits two branches as observedexperimentally. The calculated higher optical branch is found to betoo high in energy when the standard local density approximationband-structure is used but a very good agreement with the measureddispersion is obtained when the exchange splitting is reduced, tocorrespond to the experimental value of the exchange splitting.We also found a double branch along Ni(111) which is not observedexperimentally. For Fe, the calculated dispersion surprisinglyexposes a gap midway along Γ-N in disagreement withexperimental data. However, an analysis of thetemperature-dependent magnetization has predicted a similar gap atthe same wave vector, supporting the present calculations.
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