Kenning et al. discovered the collapse of the effective response time, $t_H^{\text{eff}}(t_{\text{w}};T)$, independent of aging time, $t_{\text{w}}$, as one approached the spin glass transition temperature $T_{\text{g}}$ from below. Nordblad and Lundgren observed the same effect by reducing the temperature from $T_{\text{g}}\left(H\right)$. We analyze the behavior of $\ln t_H^{\text{eff}}(t_{\text{w}};T)$ in the temperature range near and below $T_{\text{g}}$ using a scaling law that takes into account both the magnetic field $H$ and the time-dependent spin-glass coherence length $\xi (t,t_{\text{w}};T)$. An overdetermined predictive fit to the experimental data accounts for a quasioscillatory structure of $\ln t_H^{\text{eff}}(t_{\text{w}};T)$ as a function of magnetic field $H^2$ for reduced temperatures as large as $T/T_{\text{g}}=0.98$.

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• Frustrated magnetism
• Scaling laws of complex systems
• Spin glasses
• Magnetization measurements