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We measure the field dependence of spin glass free energy barriers in a thin amorphous Ge: Mn film through the time dependence of the magnetization. After the correlation length ξ (t, T) has reached the film thickness L=155 Å so that the dynamics are activated, we change the initial magnetic field by δH. In agreement with the scaling behavior exhibited in a companion Letter M. Baity-Jesi et al. , Phys. Rev. Lett. 118, 157202 (2017) PRLTAO0031-900710. 1103/PhysRevLett. 118. 157202, we find that the activation energy is increased when δH<0. The change is proportional to (δH) ^2 with the addition of a small (δH) ^4 term. The magnitude of the change of the spin glass free energy barriers is in near quantitative agreement with the prediction of a barrier model.
Guchhait et al. (Thu,) studied this question.