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Guided Vortex Motion Control in Superconducting Thin Films by Sawtooth Ion Surface Modification.

Antony Jones1,2, Simon K H Lam2, Jia Du2

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ACS Applied Materials & Interfaces
|May 16, 2020
PubMed
Summary

Researchers developed a superconducting ratchet using varying thickness to control magnetic flux quanta (vortices) motion. This tailored intrinsic pinning mechanism offers tunable vortex pumping for superconducting devices.

Keywords:
YBa2Cu3O7 thin filmscritical current asymmetryflux manipulationflux noise reductionguided vortex motionion surface modificationsuperconducting ratchet

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Superconductivity

Background:

  • Controlling magnetic flux quanta (vortices) is crucial for superconducting device functionality.
  • Existing methods include vortex anchoring, shielding, and the ratchet effect for directed motion.
  • The ratchet effect utilizes asymmetric potentials for directional particle or flux movement.

Purpose of the Study:

  • To investigate a varying thickness superconductor as a tunable superconducting ratchet.
  • To demonstrate the feasibility of creating preferential vortex motion using intrinsic pinning.
  • To explore the tunability of vortex motion direction based on geometric and material properties.

Main Methods:

  • Simulations of a superconductor with varying thickness and tailored intrinsic pinning.
  • Theoretical analysis of the ratchet vortex pinning potential.
  • Experimental validation of the superconducting ratchet concept.

Main Results:

  • A varying thickness superconductor was simulated and proven to provide preferential vortex motion.
  • The study theoretically and experimentally demonstrated the possibility of a superconducting ratchet.
  • The sawtooth shape allows tunability of vortex motion direction via ramp gradient and pinning strength.

Conclusions:

  • Varying thickness superconductors can effectively act as ratchets for controlled vortex motion.
  • This approach offers a novel method for pumping flux out of superconducting devices.
  • The tunable nature of the designed ratchet has broad implications for superconducting electronics.