Time decay of the remanent magnetization in a CuMnspin glass

The functional form of the relaxation of the thermoremnant magnetization of CuMn spin glass has been investigated. A remarkable influence of the aging process of the spin-glass state, which can give an apparent stretched exponential form of the total relaxation, is demonstrated. The spin-glass relaxation can be described by a nearly logarithmic function superimposed by an additional relaxation due to the aging process. The superimposed relaxation can be described by a stretched exponential function: $M_a$=$M_{a0}$(T,$t_w$)exp-[(t/$t_w$ ${)}^{1\mathrm{-}n}$], where $t_w$ is the wait time at constant temperature in the field-cooled state.