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

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,more » while the conformal array is more effective at higher fields where interstitial vortex flow occurs.« less
Authors:
 [1] ; ORCiD logo [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)
Publication Date:
Report Number(s):
LA-UR-16-20083
Journal ID: ISSN 0921-4534; TRN: US1700897
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Physica. C, Superconductivity
Additional Journal Information:
Journal Volume: 533; Journal ID: ISSN 0921-4534
Publisher:
Elsevier
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Superconducting vortex; Conformal pinning; Ratchet
OSTI Identifier:
1338737
Alternate Identifier(s):
OSTI ID: 1396973