Magnetic relaxation of a perturbed equilibrium spin glass state

Abstract

Magnetic relaxation experiments on a Ag(Mn) spin glass that has been subjected to temperature perturbations are reported. A dynamic quasiequilibrium state is created by allowing the spin glass to equilibrate for an extended time (100 000 s) at constant temperature in the spin glass phase. The “quasiequilibrium” (reached after 100 000 s) state is perturbed by a negative temperature cycle of different duration. The magnetic relaxation rate after the perturbation exhibits an enhanced relaxation rate at short observation times followed by a dip that extends well below the equilibrium relaxation rate at longer observation times.