Abstract
Longitudinal and transverse magnetoresistances have been measured at 4.2 K in a magnetic field up to 1.59 MA/m over a wide concentration range through the critical concentration, where fer-romagnetism disappears, for Ni–Cu, –Pt and –Rh. Magnetoresistance anisotropy (MRA) for Ni–Pt and –Rh shows the change in sign in the concentration dependence, at which the magnetocrystalline anisotropy (MCA) also changes the sign. Forced magnetoresistance (FMR) near the critical concentration is negative in sign for Ni–Cu and is positive for Ni–Pt and –Rh. The magnitude of Ni–Cu is the largest and that of Ni–Pt is the smallest. The results of MRA and FMR are discussed in connection with the degree of magnetic homogeneity and the band character of the alloys, respectively.
