Magnetomechanical Ratios and Spin and Orbital Moments for Ni-Cu Alloys

Magnetomechanical ratios ($g^{\prime }$) have been measured for eight different Ni-Cu alloys in the range 0-30.68-at.% copper. Values of $g^{\prime }$ decrease linearly with increasing Cu composition to about 24-at.% Cu and then drop off more rapidly. The results have been combined with saturation magnetization measurements from the literature to obtain values of the orbital and the spin contribution to the average moments. Based upon a short-range-order magnetic model the local electronic orbital moment is found to be $\sim 0.05$ ${\mu }_B$ for all combinations of nearest and second-nearest neighbors.