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Hysteresis mediated by a domain wall motion

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  • Nattermann, Thomas
  • Pokrovsky, Valery

Abstract

The position of an interface (domain wall) in a medium with random pinning defects is not determined unambiguously by the instantaneous value of the driving force, even on average. Employing the general theory of the interface motion in a random medium, we study this hysteresis, different possible shapes of the hysteresis loop, and the dynamical phase transitions between them. Several principal characteristics of the hysteresis, including the coercive force and the curves of dynamical phase transitions obey scaling laws and display a critical behavior in the vicinity of the mobility threshold. At finite temperature the threshold is smeared and a new range of thermally activated hysteresis appears. At a finite frequency of the driving force there exists a range of the non-adiabatic regime in which not only the position, but also the average velocity of the domain wall, displays hysteresis.

Suggested Citation

  • Nattermann, Thomas & Pokrovsky, Valery, 2004. "Hysteresis mediated by a domain wall motion," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 340(4), pages 625-635.
    • Handle: RePEc:eee:phsmap:v:340:y:2004:i:4:p:625-635
    DOI: 10.1016/j.physa.2004.05.014
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