Domain Growth in Random Magnets

TL;DR

This paper investigates how disorder affects domain growth in random ferromagnets, showing power-law growth with variable exponents influenced by disorder barriers, through Monte Carlo simulations and theoretical analysis.

Contribution

It provides detailed Monte Carlo results for the random-bond Ising model and interprets the effects of disorder barriers on domain growth dynamics.

Findings

Power-law domain growth with variable exponents

Disorder barriers exhibit logarithmic dependence on domain size

Implications for both conserved and nonconserved dynamics

Abstract

We study the kinetics of domain growth in ferromagnets with random exchange interactions. We present detailed Monte Carlo results for the nonconserved random-bond Ising model, which are consistent with power-law growth with a variable exponent. These results are interpreted in the context of disorder barriers with a logarithmic dependence on the domain size. Further, we clarify the implications of logarithmic barriers for both nonconserved and conserved domain growth.