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Vortex Ratchet Effect in a NbC Strip With a Periodic Edge Indentation.

F Porrati1, A O Pokusinskyi2,3, S Barth1

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Researchers demonstrated a superconducting ratchet effect in a niobium carbide strip using edge indentations. This method controls magnetic flux quantum motion, enabling non-reciprocal currents for potential energy-efficient electronic devices.

Keywords:
TDGL simulationfocused ion beam induced depositionnanofabricationratchet effectsuperconductivityvortex matter

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Controlling magnetic flux quantum motion in superconductors is vital for fluxonic devices.
  • The superconducting ratchet effect offers non-reciprocal, dissipationless currents for rectifiers and energy-efficient electronics.

Purpose of the Study:

  • To investigate non-reciprocal current flow and vortex dynamics in a superconducting strip with periodic edge indentations.
  • To explore symmetry breaking via edge barrier disparities for superconducting ratchet systems.

Main Methods:

  • Fabrication of a superconducting niobium carbide (NbC) strip with periodic edge indentations.
  • Experimental measurement of non-reciprocal current flow and vortex dynamics under magnetic fields.
  • Numerical simulations using the time-dependent Ginzburg-Landau (TDGL) equation.

Main Results:

  • Demonstrated non-reciprocal current flow and vortex dynamics in the NbC strip.
  • Observed a maximum ratchet efficiency of ~35% (critical current) and ~60% (voltage) at 16 mT.
  • Numerical simulations revealed "flux pockets" and diverse vortex configurations like chains and jets.

Conclusions:

  • Periodic edge indentations effectively induce current crowding and suppress edge barriers, facilitating vortex entry and enabling the superconducting ratchet effect.
  • The demonstrated method offers a novel approach to controlling vortex dynamics and developing superconducting rectifiers.
  • Findings support the potential for energy-efficient computing, memory, and switching applications.