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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-1147
DTSTART:20080403T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260506T210147Z
LAST-MODIFIED:20080331T145247Z
LOCATION:5310 Chamberlin
SUMMARY:Vortex dynamics in tailored superconducting channels: ratchets
  and circles\, R. G. Herb Condensed Matter Seminar\, Britton Plourde\,
  Syracuse University
DESCRIPTION:The dynamics of vortex flow in confined geometries can be 
 explored with tailored weak-pinning channels of superconducting a-NbGe
  surrounded by strong-pinning NbN channel edges. The lack of pinning a
 llows the vortices to move through the channels with the dominant inte
 raction determined by the shape of the channel walls. We have fabricat
 ed such weak-pinning channels with asymmetric sawtooth edges for contr
 olling the motion of vortices. I will present our measurements of subs
 tantial asymmetries in the vortex dynamics in these channels\, charact
 eristic of a ratchet\, and compare these with similar measurements on 
 a set of channels with uniform width. We have also studied vortices fl
 owing in circular channels arranged in a Corbino disk geometry. We hav
 e developed a SQUID voltmeter arrangement for resolving the flux flow 
 voltage from a small number of vortices moving through such a single c
 ircular mesoscopic channel free from edge barriers.
URL:https://www.physics.wisc.edu/events/?id=1147
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