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Published on: August 2, 2019
Depinning phase transition in the two-dimensional clock model with quenched randomness.
1Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China.
Summary
This study explores the depinning phase transition in a 2D random-field clock model. Critical exponents and transition fields depend on random field properties and initial domain orientations.
Area of Science:
- Condensed Matter Physics
- Statistical Mechanics
- Computational Physics
Background:
- The depinning phase transition is crucial for understanding driven systems in disordered media.
- The random-field clock model provides a framework to study magnetic domain behavior under external fields.
Purpose of the Study:
- To systematically investigate the depinning phase transition in the 2D driven random-field clock model.
- To determine the critical exponents and transition field.
- To analyze the influence of random-field distribution and initial domain orientations on the transition.
Main Methods:
- Monte Carlo simulations were employed to model the system.
- A short-time dynamic approach was utilized to determine critical parameters.
Main Results:
- Critical exponents were found to vary with random-field distribution and strength.
- The domain interface roughening dynamics were classified into a new subclass (ζ≠ζ(loc)≠ζ(s), ζ(loc)≠1).
- The transition field and critical exponents were shown to be dependent on the initial magnetization orientations of the domains.
Conclusions:
- The study reveals a complex depinning transition influenced by disorder characteristics.
- Initial domain configurations play a significant role in the critical behavior of the model.
- The findings contribute to a deeper understanding of phase transitions in disordered magnetic systems.
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