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Dynamical transitions of a driven Ising interface.

Manish K Sahai1, Surajit Sengupta

  • 1Satyendra Nath Bose National Centre for Basic Sciences, Block-JD, Sector-III, Salt Lake, Kolkata 700 098, India.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|June 4, 2008
PubMed
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We investigated interface dynamics in a 3D Ising system under a moving nonuniform field. The interface transitions from pinned states with commensurate-incommensurate changes to depinned growth with Kardar-Parisi-Zhang exponents at higher velocities.

Area of Science:

  • Statistical physics
  • Condensed matter physics

Background:

  • Interfaces in magnetic systems are crucial for understanding phase transitions.
  • External fields can significantly alter interface behavior and dynamics.

Purpose of the Study:

  • To investigate the structural and dynamical transitions of an interface in a 3D Ising system.
  • To analyze the effect of a moving nonuniform external field on interface behavior.

Main Methods:

  • Simulating a three-dimensional Ising system with a time-dependent, nonuniform external magnetic field.
  • Analyzing interface structure and dynamics under varying field velocities.
  • Studying commensurate-incommensurate transitions and Kardar-Parisi-Zhang (KPZ) scaling.

Main Results:

Related Experiment Videos

  • The interface exhibits pinning by the field profile at low velocities, showing commensurate-incommensurate transitions.
  • At higher velocities, the interface depins and its growth follows Kardar-Parisi-Zhang (KPZ) exponents.
  • The orientation of the field's sign-changing plane influences the interface dynamics.

Conclusions:

  • The study reveals distinct dynamical regimes for interfaces in driven Ising systems.
  • The observed transitions are sensitive to the interplay between interface pinning and external field velocity.
  • The findings contribute to understanding driven soft matter systems and interface phenomena.