We have investigated the influence of thickness on the pinning properties of granular sputtered Nb films in a parallel magnetic field. The presence of a crossover in the pinning mechanisms at some critical thickness dc was established. Below dc the pinning is due to individual vortices. Above dc the commensurability between the vortex period and the film thickness occurs, causing a large increase in the critical current density due to surface pinning. It is shown that, in the vortex-free limit, when the critical current is determined by the depairing current, the effect of the commensurability is not present. © IOP Publishing Ltd.

Prischepa, S., Montemurro, D., Cirillo, C., Attanasio, C., Salvato, M., Merlo, V., et al. (2006). Thickness dependence of pinning mechanisms in granular Nb thin films. SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 19(11), 1124-1129 [10.1088/0953-2048/19/11/006].

Thickness dependence of pinning mechanisms in granular Nb thin films

SALVATO, MATTEO;MERLO, VITTORIO;
2006-01-01

Abstract

We have investigated the influence of thickness on the pinning properties of granular sputtered Nb films in a parallel magnetic field. The presence of a crossover in the pinning mechanisms at some critical thickness dc was established. Below dc the pinning is due to individual vortices. Above dc the commensurability between the vortex period and the film thickness occurs, causing a large increase in the critical current density due to surface pinning. It is shown that, in the vortex-free limit, when the critical current is determined by the depairing current, the effect of the commensurability is not present. © IOP Publishing Ltd.
2006
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore FIS/03 - FISICA DELLA MATERIA
English
Con Impact Factor ISI
Critical current density (superconductivity); Magnetic field effects; Niobium; Sputter deposition; Thin films; Parallel magnetic fields; Pinning properties; Surface pinning; Vortex periods; Granular materials
Prischepa, S., Montemurro, D., Cirillo, C., Attanasio, C., Salvato, M., Merlo, V., et al. (2006). Thickness dependence of pinning mechanisms in granular Nb thin films. SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 19(11), 1124-1129 [10.1088/0953-2048/19/11/006].
Prischepa, S; Montemurro, D; Cirillo, C; Attanasio, C; Salvato, M; Merlo, V; Lykov, A; Tsvetkov, A
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/38029
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