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Vortex motion in asymmetric pinning landscapes shows complex behavior. The study reveals that vortex-vortex interactions and the ratio of interaction distance to pinning potential period are key to reversed rectified motion.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Vortex dynamics in superconductors and superfluids are crucial for understanding their electronic properties.
  • Asymmetric pinning landscapes introduce complex interactions affecting vortex motion.
  • Rectified vortex motion, driven by AC excitation, is a phenomenon with potential applications in superconducting devices.

Purpose of the Study:

  • To experimentally investigate the origins of multiply reversed rectified vortex motion.
  • To determine the influence of vortex-vortex interactions and pinning potential characteristics on rectified motion.
  • To explore the relationship between the pinning potential period and vortex drift behavior.

Main Methods:

  • Experimental study of vortex motion in four different asymmetric pinning landscape samples.
  • Varying the period of the asymmetric pinning potential across samples.
  • Applying AC excitation and measuring the resulting DC voltage (V(dc)) to analyze average vortex drift.
  • Comparing experimental results with theoretical models and computer simulations.

Main Results:

  • For large pinning potential periods, average vortex drift is consistently from larger to smaller dots.
  • Reducing the pinning potential period leads to multiple sign reversals in the DC response as a function of applied field.
  • The number of observed sign reversals increases with decreasing pinning potential period.
  • Experimental findings align with predictions from recent computer simulations.

Conclusions:

  • Multiply reversed rectified vortex motion originates from both vortex-vortex interactions and the interplay between interaction distance and pinning potential period.
  • The period of the asymmetric pinning potential is a critical parameter controlling vortex rectification effects.
  • Understanding these characteristic lengths is essential for controlling and utilizing vortex rectification in technological applications.