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The Pinning Potential at Single Flux Vortices Investigated Using Submicron Hall Probes
Stoddart, S T; Geim, A K; Bending, S J; Henini, M
Physica B. 1994;194:1899-1900.
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Abstract
We have imaged individual flux vortices in 200 nm-thick superconducting Pb films using sub-micron Hall probes with an excellent combination of spatial and temporal resolution. Correlation of signals at separate Hall contacts shows that flux enters the film in correlated bundles of approximately 5 mum diameter. With an applied supercurrent, we have been able to move individual vortices distances of typically 30-40 nm between minima in the pinning potential that differ by approximately 0.5eV. We have determined pinning forces as a function of temperature for individual pinning sites. At higher applied fields the intervortex interaction alone is sufficient to move vortices between different potential minima as the temperature approaches T(c).
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- Related website <Go to ISI>://A1994NC27500274
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