Hall Effect and Magnetoresistance in Ferromagnetic Amorphous Fe-Co and Fe-Ni Alloys

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The magnetoresistance over the temperature range from 77 K to the crystallization temperature and the Hall resistivity at room temperature were measured for the rapidly quenched amorphous alloys (Fe_<1-x>Co_x)_<78>Si_<10>B_<12> and (Fe_<1-x>Ni_x)_<78>Si_<10>B_<12>. The anisotropic magnetoresistance ratio 〓ρ/ρ in both systems was roughly one order of magnitude smaller than that of crystalline Fe, Co and Ni metals and their alloys, and the normal and anomalous Hall coefficients R_0 and R_s were roughly one or two order of magnitude greater than those of the crystalline metals and alloys. The values of 〓ρ/ρ and R_0 and R_s monotonically changed with composition x at room temperature. The changes in 〓ρ/ρ and R_s with composition were compared with those for the Ni-based crystalline alloys on the basis of Berger's theory.
東北大学の論文