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 (SQUID) 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. 
T.W. Heitmann (1), K. Yu (1), C. Song (1), M.P. DeFeo (1), B.L.T.   Plourde (1), M.B.S. Hesselberth (2), P.H. Kes (2) ((1) D...