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AC Electrokinetic Phenomena Generated by Microelectrode Structures
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Domain wall depinning in random media by ac fields.

A Glatz1, T Nattermann, V Pokrovsky

  • 1Institut für Theoretische Physik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany.

Physical Review Letters
|February 7, 2003
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Summary

Interface motion in random media under AC fields shows a double hysteresis loop in the non-adiabatic regime. This phenomenon, absent in the adiabatic limit, is explained by scaling and renormalization group methods.

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Area of Science:

  • Physics
  • Soft Matter Physics
  • Complex Systems

Background:

  • Understanding the dynamics of interfaces in disordered media is crucial for various physical phenomena.
  • Driven interfaces in random media exhibit complex behaviors like depinning transitions.

Purpose of the Study:

  • To investigate the non-adiabatic effects on the viscous motion of an interface driven by an AC external field.
  • To explain the observed double hysteresis loop and its characteristics.

Main Methods:

  • The study employs scaling arguments to analyze the interface dynamics.
  • An approximate renormalization group calculation is utilized to model the system.

Main Results:

  • The non-adiabatic regime reveals a smeared depinning transition with a double hysteresis loop.
  • This double hysteresis is absent in the adiabatic (low frequency) case.
  • The low-frequency limit of the hysteresis loop is characterized by the depinning threshold and adiabatic critical exponents.

Conclusions:

  • The non-adiabatic AC field drives unique interface dynamics, leading to double hysteresis.
  • Scaling arguments and renormalization group methods successfully explain these observed phenomena.
  • The findings provide insights into driven interface behavior in disordered systems.