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Pinning, flux diodes and ratchets for vortices interacting with conformal pinning arrays

Journal Article · · Physica. C, Superconductivity
 [1];  [2];  [3];  [4];  [1];  [1];  [5]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. of Notre Dame, IN (United States). Dept. of Physics; Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; Northern Illinois Univ., DeKalb, IL (United States). Dept. of Physics
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  5. Univ. of Notre Dame, IN (United States)
+ Show Author Affiliations

A conformal pinning array can be created by conformally transforming a uniform triangular pinning lattice to produce a new structure in which the six-fold ordering of the original lattice is conserved but where there is a spatial gradient in the density of pinning sites. Here we examine several aspects of vortices interacting with conformal pinning arrays and how they can be used to create a flux flow diode effect for driving vortices in different directions across the arrays. Under the application of an ac drive, a pronounced vortex ratchet effect occurs where the vortices flow in the easy direction of the array asymmetry. When the ac drive is applied perpendicular to the asymmetry direction of the array, it is possible to realize a transverse vortex ratchet effect where there is a generation of a dc flow of vortices perpendicular to the ac drive due to the creation of a noise correlation ratchet by the plastic motion of the vortices. We also examine vortex transport in experiments and compare the pinning effectiveness of conformal arrays to uniform triangular pinning arrays. In conclusion, we find that a triangular array generally pins the vortices more effectively at the first matching field and below, while the conformal array is more effective at higher fields where interstitial vortex flow occurs.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1338737
Alternate ID(s):
OSTI ID: 1356820
OSTI ID: 1396973
Report Number(s):
LA-UR--16-20083
Journal Information:
Physica. C, Superconductivity, Journal Name: Physica. C, Superconductivity Vol. 533; ISSN 0921-4534
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

Vortex Dynamic Phases in Type II Superconducting Strips with Regular and Flattened Triangular Pinning Arrays journal August 2018
Self-assembled vortex crystals induced by inhomogeneous magnetic textures journal March 2019
Influence of ultrashort laser drilling on magnetic and transport characteristics of HTS tapes journal June 2019
Vortex dynamics in type-II superconductors under strong pinning conditions journal October 2017

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Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Conformal pinning
Ratchet
Superconducting vortex