Magnetic anisotropy of CuMn spin glasses

Hysteresis and ac-susceptibility measurements of various remanent states of CuMn have been performed to further elucidate the problem of magnetic anisotropy energy below Tf. Our experimental data are well described by a phenomenological model based on the existence of two different spin systems. We conclude that the anisotropy energy of CuMn is a field-dependent quantity.