Time decay of the saturated remanent magnetization in a metallic spin glass.

The time decay of the saturated remanent magnetization (M (s)) has been studied in the amorphous metallic spin glass (Fe(0.15)Ni(0.85))(75)P(16)B(6)Al(3). This relaxation, which by nature is different from the zero field equilibrium relaxation, shows at low temperatures ( T/T(g)0.98) a time variation accurately described by a pure power law. At temperatures in the immediate vicinity of T(g), the experimental time decay can be described by a power law times a stretched exponential functional form: M(s) = M(o) t(-m) exp(-(t/tau(p))(1-n).