Time decay of the remanent magnetization in a Cu<i>Mn</i>spin glass

Abstract

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/${t}_{w}$ ${)}^{1\mathrm{\ensuremath{-}}n}$], where ${t}_{w}$ is the wait time at constant temperature in the field-cooled state.