Hysteresis in CuMn : The effect of spin orbit scattering on the anisotropy in the spin glass state

Measurements of the hysteresis cycle of the magnetization of CuMn 1 % in the spin glass state as a function of the concentration of a non magnetic impurity show that the width of the hysteresis is proportional to the concentration of Au at a rate of 6.2 ± 0.4 kOe/at. % Au. A much smaller rate observed for Al and Ag and higher rate observed for Pt demonstrate unambiguously that the spin orbit interaction is responsible for the anisotropy field in the spin glass state. A comparison is made with similar alloys studied by spin resonance by Okuda and Date and some implication are discussed.