The authors show that longitudinal magnetic excitations are responsible for an additional T 3/2 temperature dependent term in the decrease of the magnetisation of amorphous ferromagnets at low temperatures. This provides a possible explanation for the discrepancy on the values for the spin wave stiffness as measured by magnetisation and neutron scattering experiments. The discrepancy is compared to the anomalous temperature dependence of the resistivity, another effect of these longitudinal magnetic excitations.
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Contínentino et al. (1979) studied this question.
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