Magnetic Field Dependence of Spin Glass Free Energy Barriers

Abstract

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 $\xi (t,T)$ has reached the film thickness $\mathcal{L}=155$~Å~so that the dynamics are activated, we change the initial magnetic field by $\delta H$. In agreement with the scaling behavior exhibited in a companion Letter [Janus collaboration: M. Baity-Jesi {\it et al.}, Phys. Rev. Lett. {\bf 118}, 157202 (2017)], we find the activation energy is increased when $\delta H<0$. The change is proportional to $(\delta H{)}^2$ with the addition of a small $(\delta H{)}^4$ 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.

6 pages, 3 figures, 1 table

References in corpus (2)

• Large-scale Monte Carlo simulations of the isotropic three-dimensional Heisenberg spin glass
• Matching microscopic and macroscopic responses in glasses

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