Abstract
The effects of a magnetic field on spin glass dynamics are explored for a ${\mathrm{Cu}}_{0.887}{\mathrm{Mn}}_{0.113}$ thin film of thickness $\mathcal{L}=20$ nm in a multilayer configuration. An experimental protocol removes uncertainties associated with the time dependence of the field-cooled magnetization ${M}_{\text{FC}}(t,T)$. Activated dynamics is exhibited after the spin glass correlation length $\ensuremath{\xi}(t,T)$ has reached $\mathcal{L}$, creating a quasiequilibrium state. The activation energy depends upon the strength of the magnetic field $H$. The magnitude of the activation energy diminishes as ${H}^{2}$, the coefficient of which is proportional to the number of correlated spins. A quantitative fit requires a ``pancakelike'' correlated region, associated with the $T=0$ phase transition for a spin glass in $D=2$ dimensions.
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