The effect of defects on magnetic droplet nucleation
The effect of defects on magnetic droplet nucleation
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 analyse 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 single-droplet from the multi-droplet regime) depends on the system size, the defect fraction, and the external field.
Defects, Droplets, Dynamic spinodal line, Ising model, Metastable lifetime, Monte Carlo simulation
128426
Ettori, Federico
9107a094-564a-4fbd-b607-c0ad38fbc68e
Sluckin, Timothy J.
8dbb6b08-7034-4ae2-aa65-6b80072202f6
Biscari, Paolo
352c91ab-eed3-4578-97c6-a3830bcb90c6
1 February 2023
Ettori, Federico
9107a094-564a-4fbd-b607-c0ad38fbc68e
Sluckin, Timothy J.
8dbb6b08-7034-4ae2-aa65-6b80072202f6
Biscari, Paolo
352c91ab-eed3-4578-97c6-a3830bcb90c6
Ettori, Federico, Sluckin, Timothy J. and Biscari, Paolo
(2023)
The effect of defects on magnetic droplet nucleation.
Physica A: Statistical Mechanics and its Applications, 611, , [128426].
(doi:10.1016/j.physa.2022.128426).
Abstract
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 analyse 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 single-droplet from the multi-droplet regime) depends on the system size, the defect fraction, and the external field.
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Ettori_etalPhysicaA2023preprint (1)
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Accepted/In Press date: 14 December 2022
e-pub ahead of print date: 23 December 2022
Published date: 1 February 2023
Additional Information:
Funding Information:
TJS is grateful to the Politecnico di Milano for hospitality during the period of this study.
Publisher Copyright:
© 2022 Elsevier B.V.
Keywords:
Defects, Droplets, Dynamic spinodal line, Ising model, Metastable lifetime, Monte Carlo simulation
Identifiers
Local EPrints ID: 473620
URI: http://eprints.soton.ac.uk/id/eprint/473620
ISSN: 0378-4371
PURE UUID: 52d994c5-3d1a-4514-8e50-b969ac162d45
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Date deposited: 25 Jan 2023 17:36
Last modified: 17 Mar 2024 02:32
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Author:
Federico Ettori
Author:
Paolo Biscari
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