Magneto-volume effect of Fe-based amorphous ferromagnetic alloys

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Abstract
The magneto-volume effect of Fe-based amorphous alloys has been studied by making a systematic study of the thermal expansion and magnetic properties of (FexM1-x)85N15 where M=Cr, Mn, Co and Ni. It has been found that the magneto-volume effect, omega m, is a simple function of the effective 3d electron number Neff with the calculation based on the charge transfer model with a maximum at Neff=8.2, where the spontaneous magnetisation also reaches a maximum. It has also been found that the ratio of the spin-wave stiffness constant obtained by neutron scattering, Ds, to that estimated from the temperature dependence of magnetisation, Dm, exhibits the same Neff dependence as omega m, thus providing clear experimental evidence that the deviation of Ds from Dm in Fe-based amorphous alloys is due to the Invar effect.