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

Abstract

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. We find that a triangular array generally pins the vortices more effectively at the first matching field and below, while themore » conformal array is more effective at higher fields where interstitial vortex flow occurs.« less

Authors:
; ORCiD logo; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1356820
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physica. C, Superconductivity; Journal Volume: 533
Country of Publication:
United States
Language:
English

Citation Formats

Olson Reichhardt, C. J., Wang, Y. L., Xiao, Z. L., Kwok, W. K., Ray, D., Reichhardt, C., and Jankó, B.. Pinning, flux diodes and ratchets for vortices interacting with conformal pinning arrays. United States: N. p., 2017. Web. doi:10.1016/j.physc.2016.05.024.
Olson Reichhardt, C. J., Wang, Y. L., Xiao, Z. L., Kwok, W. K., Ray, D., Reichhardt, C., & Jankó, B.. Pinning, flux diodes and ratchets for vortices interacting with conformal pinning arrays. United States. doi:10.1016/j.physc.2016.05.024.
Olson Reichhardt, C. J., Wang, Y. L., Xiao, Z. L., Kwok, W. K., Ray, D., Reichhardt, C., and Jankó, B.. Wed . "Pinning, flux diodes and ratchets for vortices interacting with conformal pinning arrays". United States. doi:10.1016/j.physc.2016.05.024.
@article{osti_1356820,
title = {Pinning, flux diodes and ratchets for vortices interacting with conformal pinning arrays},
author = {Olson Reichhardt, C. J. and Wang, Y. L. and Xiao, Z. L. and Kwok, W. K. and Ray, D. and Reichhardt, C. and Jankó, B.},
abstractNote = {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. 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.},
doi = {10.1016/j.physc.2016.05.024},
journal = {Physica. C, Superconductivity},
number = ,
volume = 533,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2017},
month = {Wed Feb 01 00:00:00 EST 2017}
}