MAGNETIC AND TRANSPORT-PROPERTIES OF FE-MO AND FE-W ALLOYS

Two series of polycrystalline Fe100-xMox and Fe100-xWx (0 < x < 10 at. %) alloys were made. In order to preserve a single bcc phase, alloy s amples, depending on the x value, were quenched from various temperatu res T(Q). In general, T(Q) is higher than 850-degrees-C, and increases with x. X-ray diffraction was used to check the phase and the lattice constant of each sample. Magnetoresistance, electrical resistivity, a nd magnetic moment were measured at 4 K. Those experimental data are a nalyzed for Fe-Cr, Fe-Mo, and Fe-W alloys, especially the effects of m oving down along the VIB column from Cr to W on the transport and magn etic properties. Comparison is made with Co-based alloys, where the ch anges of the spin-up resistivity from Co-Ni to Co-Pd and from Co-Pd to Co-Pt are due to the increase in s-s scattering. For Fe-based alloys, however, because the spin-down d band is partially empty (the roles o f spin-up and -down bands are reversed), the spin-down resistivity is from s-d scattering instead.