Phys. Rev. Lett. 92, 097003 (2004) [4 pages]Critical Field for Complete Vortex Expulsion from Narrow Superconducting StripsReceived 23 October 2002; published 5 March 2004 We have measured the maximum field for which vortices are completely expelled from a thin-film superconducting strip. Niobium strips of width W were field cooled and imaged with a scanning Hall-probe microscope. Below a critical field Bm≈Φ0/W2 all flux was expelled; above this field vortices were observed with a density increasing approximately linearly with field. The small value of the critical field, which is orders of magnitude less than in the bulk, implies that superconducting devices should be designed with narrow wires to eliminate the generation of noise from vortex motion. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.097003
DOI:
10.1103/PhysRevLett.92.097003
PACS:
74.25.Qt, 74.25.Op, 74.78.–w
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