The Effect of Defects on Magnetic Droplet Nucleation
| Autor: | Federico Ettori, Timothy J. Sluckin, Paolo Biscari |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Statistics and Probability
metastable lifetime dynamic spinodal line droplets Statistical Mechanics (cond-mat.stat-mech) Ising model FOS: Physical sciences Statistical and Nonlinear Physics Ising model defects metastable lifetime dynamic spinodal line droplets Monte Carlo simulation defects Monte Carlo simulation Condensed Matter - Statistical Mechanics |
| Popis: | Defects and impurities strongly affect the timing and the character of the (re)ordering or disordering transitions of thermodynamic systems captured in metastable states. In this paper we analyze the case of two-dimensional magnetic systems. We adapt the classical JMAK theory to account for the effects of defects on the free energy barriers, the critical droplet area and the associated metastable time. The resulting predictions are successfully tested against the Monte-Carlo simulations performed by adopting Glauber dynamics, to obtain reliable time-dependent results during the out-of-equilibrium transformations. We also focus on finite-size effects, and study how the spinodal line (separating the singledroplet from the multi-droplet regime) depends on the system size, the defect fraction, and the external field. 29 pages, 10 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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