Domain Dynamics in Nonequilibrium Random-Field Ising Models

• Authors: S. Hrivňak , M. Žukovič
• Languages of publication: EN

Abstracts

EN

We employ Monte Carlo simulations in order to study dynamics of the magnetization and domain growth processes in the random-field Ising models with uniform and Gaussian random field distributions of varying strengths. Domain sizes are determined directly using the Hoshen-Kopelman algorithm. For either case, both the magnetization and the largest domain growth dynamics are found to follow the power law with generally different exponents, which exponentially decay with the random field strength. Moreover, for relatively small random fields the relaxation is confirmed to comply with different regimes at early and later times. No significant differences were found between the results for the uniform and Gaussian distributions, in accordance with the universality assumption.

Keywords

EN

75.10.Hk; 75.10.-b; 75.60.-d; 75.78.-n

Discipline

• 75.60.-d: Domain effects, magnetization curves, and hysteresis(for dynamics of domain structures, see 75.78.Fg)
• 75.10.Hk: Classical spin models
• 75.10.-b: General theory and models of magnetic ordering(see also 05.50.+q Lattice theory and statistics)
• 75.78.-n: Magnetization dynamics

• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 126
• Issue: 1
• Pages: 38-39

Dates

published

2014-07

Contributors

author

S. Hrivňak

• Institute of Physics, Faculty of Sciences, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia

author

M. Žukovič

• Institute of Physics, Faculty of Sciences, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia

References

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• [2] M. Aizenman, J. Wehr, Phys. Rev. Lett 62, 2503 (1989), doi: 10.1103/PhysRevLett.62.2503
• [3] S. Sinha, P.K. Mandal, Phys. Rev. E 87, 022121 (2013), doi: 10.1103/PhysRevE.87.022121
• [4] J. Esser, U. Nowak, K.D. Usadel, Phys. Rev. B 55, 5866 (1997), doi: 10.1103/PhysRevB.55.5866
• [5] H. Hoshen, R. Kopelman, Phys. Rev. B 14, 3438 (1976), doi: 10.1103/PhysRevB.14.3438

Identifiers

DOI

10.12693/APhysPolA.126.38