A. Palau, C. Montón, V. Rouco, X. Obradors and T. Puig
Phys. Rev. B 85, 012502 (2012)
DOI: http://dx.doi.org/10.1103/PhysRevB.85.012502
We investigate guided vortex motion in high-temperature YBa2Cu3O7 thin films patterned with an array of asymmetric blind antidots. A preferential vortex motion along spatial asymmetric pinning potentials has been directly observed by changing the driving current direction. Transport measurements reveal that effective ratchet potentials are created by fixed vortices strongly pinned within the antidots while the spatial asymmetry is transferred to interstitial vortices. We study a novel ratchet system that requires vortex-vortex interactions to work, in contrast with the individual vortex effects studied in conventional ratchet systems. By tuning the magnetic field and temperature, we are able to control the transition from a single vortex pinning regime to a region where collective effects become important and determine the range where the rectification effect is activated.
A. Palau, C. Montón, V. Rouco, X. Obradors and T. Puig
Phys. Rev. B 85, 012502 (2012)
DOI: http://dx.doi.org/10.1103/PhysRevB.85.012502
We investigate guided vortex motion in high-temperature YBa2Cu3O7 thin films patterned with an array of asymmetric blind antidots. A preferential vortex motion along spatial asymmetric pinning potentials has been directly observed by changing the driving current direction. Transport measurements reveal that effective ratchet potentials are created by fixed vortices strongly pinned within the antidots while the spatial asymmetry is transferred to interstitial vortices. We study a novel ratchet system that requires vortex-vortex interactions to work, in contrast with the individual vortex effects studied in conventional ratchet systems. By tuning the magnetic field and temperature, we are able to control the transition from a single vortex pinning regime to a region where collective effects become important and determine the range where the rectification effect is activated.
