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

The time decay of the saturated remanent magnetization (Mₛ) has been studied in the amorphous metallic spin glass (Fe0.15{Ni}0.85)₇₅P ₁₆B₆{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: ${M}ₛ$=${M}₀t^-m exp[-(t/τₚ{)}^{1{{-}}n}$]. .AE