ON THE THERMOELECTRIC-POWER OF AMORPHOUS FERROMAGNETS

The spin-disorder model is adopted to calculate the electrical resistivity and thermoelectric power of ferromagnetic metallic galsses within the molecular field approximation. The resistivity expression interpolates correctly between the low (T = 0 K) and the high temperature (T TC) results derived previously. Using Mott's formula a magnetic contribution Sm(T) to the thermopower is calculated which exhibits a nonlinear temperature dependence. Both, sign and curvature of Sm(T) are correlated with the actual position of 2kF in the structure factor. For a combined spin and potential scattering the total thermopower is evaluated according to the Nordheim-Gorte rule. The results reproduce qualitatively sign and curvature of the thermopower observed experimentally in ferromagnetic metallic glasses. Copyright © 1984 WILEY-VCH Verlag GmbH & Co. KGaA