Nonequilibrium dynamics in a Ag(Mn) spin glass are investigated by measurements of the temperature dependence of the remanent magnetization. Using specific cooling protocols before recording the thermo- or isothermal remanent magnetizations on reheating, it is found that the measured curves effectively disclose nonequilibrium spin glass characteristics such as aging and memory phenomena as well as an extended validity of the superposition principle for the relaxation. The usefulness of this “simple” dc method is discussed, as well as its applicability to other disordered magnetic systems.

• Received 22 August 2000

DOI:https://doi.org/10.1103/PhysRevB.63.092401