Absolute thermoelectric power in amorphous ${\mathrm{Fe}}_x{\mathrm{Ni}}_{80-x}{\mathrm{B}}_{19}{\mathrm{Si}}_1$ alloys

The absolute thermoelectric power $S$ of glassy ${\mathrm{Fe}}_x{\mathrm{Ni}}_{80-x}{\mathrm{B}}_{19}{\mathrm{Si}}_1$ ($x=10,13,16\mathrm{}$) alloys has been measured from 4.2 to 300 K. Of all the available transport theories, only the Mott $s-d$ scattering and Kasuya models reproduce reasonably well the experimental results on composition and temperature dependence of $S$ for temperatures below $T_C$, the Curie temperature. Both these models, however, fail to account for the observed behavior of $S$ for $T\gtrsim T_C$. Arguments are presented to show that the nonlinear thermoelectric power (TEP) in magnetic glasses is basically due to the dominant contribution to TEP arising from the magnetic scattering from magnetic atoms for $T\lesssim T_C$.