Abstract
We report on analytical and numerical results for the time evolution of a ~lattice! model of ferromagnetic particles after field inversion. Relaxation from the metastable phase occurs by superposition of two independent spin-flip processes: with probability 1 2 p, the flip obeys the Metropolis rule at finite temperature, T, while the flip is performed at random, as for T!‘, with probability p. For small p, the latter process mimics quantum tunneling or any other sort of impurity that would induce both additional randomness and a nonequilibrium steady-state condition asymptotically. Critical avalanches and constant magnetic viscosity at low T ensue as two key features of the relaxation for any pfi0. This has some implications for experiments on demagnetization and mesoscopic quantum coherence. @S0163-1829~97!08437-3#
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