Picovoltmeter for probing vortex dynamics in a single weak-pinning Corbino channel.
We have developed a picovoltmeter using a Nb dc superconducting quantum interference device for measuring the flux-flow voltage from a small number of vortices moving through a submicron weak-pinning superconducting channel. We have applied this picovoltmeter to measure the vortex response in a single channel arranged in a circle on a Corbino disk geometry. The circular channel allows the vortices to follow closed orbits without encountering any sample edges, thus eliminating the influence of entry barriers.
Heitmann
T W
TW
Department of Physics, Syracuse University, Syracuse, New York 13244-1130, USA.
Yu
K
K
Song
C
C
DeFeo
M P
MP
Plourde
B L T
BL
Hesselberth
M B S
MB
Kes
P H
PH