Orbital and Spin Magnetization in Fe-Co, Fe-Ni, and Ni-Co

The effective electronic orbital contribution M₀ and the effective electronic spin contribution M_s to the spontaneous magnetization M_t for binary alloys of Fe, Co, and Ni are determined from Scott's measured magnetomechanical g'-factors using the relations M₀M_t=(2-g')g' and M_sM_t=2(g'-1)g' where g' is assumed to be independent of the strength of the magnetic field and the temperature. It is believed that M₀M_t has several-fold greater accuracy when determined from the g' factors than when determined from ferromagnetic-resonance g factors. In terms of the Bohr magneton μ_B, the orbital magnetic moments for the pure elements at 300°K are: for iron, (0.0918+/-0.0033)μ_B (4.22% of M_t); for cobalt, (0.1472+/-0.0034)μ_B (8.81% of M_t); and for nickel, (0.0508+/-0.0012)μ_B (8.92% of M_t). The M_s values for the fcc phases of the alloys agree well with those reported by Meyer and Asch from their g-factor data. For these alloys, M₀ is much more sensitive to the crystalline structure than M_s and M_t are. The relationship g^'-1+g^-1=1 holds for Fe-Ni and Fe-Co alloys (with the exception of one point) within the accuracy of the g-factor measurements (~0.1-1.0%).