Flux Pinning in a Superconductor by an Array of Submicrometer Magnetic Dots
J. I. Martín, M. Vélez, J. Nogués, Ivan K. Schuller
DOI 10.1103/PhysRevLett.79.1929 · Physical Review Letters
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Abstract
Triangular arrays of submicrometer magnetic dots, with typical spacing of 400–600 nm and diameters close to 200 nm, have been fabricated by electron beam lithography to study pinning effects on Nb thin films. The resistivity versus magnetic field curves exhibit regular structure. Minima appear at constant field intervals, given by the lattice parameter of the dot array. The angular, current, and temperature dependencies of the resistivity imply synchronized pinning by the magnetic array which is relevant at high vortex velocities, when the order in the vortex lattice increases.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.3 | Pressure not reported | onset |
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