Guiding of vortices and ratchet effect in superconducting films with asymmetric pinning potential

Abstract

Two-dimensional vortex dynamics in a ratchet washboard planar pinning potential (PPP) in the presence of thermal fluctuations is considered on the basis of a Fokker-Planck equation. Explicit expressions for two new nonlinear anisotropic voltages (longitudinal and transverse with respect to the current direction) are derived and analyzed. The physical origin of these odd (with respect to magnetic field or transport current direction reversal) voltages is caused by the interplay between the even effect of vortex guiding and the ratchet asymmetry. Both new voltages are going to zero in the linear regimes of the vortex motion (i.e. in the thermally activated flux flow (TAFF) and ohmic flux flow (FF) regimes) and have a bump-like current or temperature dependence in the vicinity of the highly nonlinear resistive transition from the TAFF to the FF.

arXiv comment15 pages, 18 figures

References in corpus (4)

• Reducing vortex density in superconductors using the ratchet effect
• Experimental ratchet effect in superconducting films with periodic arrays of asymmetric potentials
• Asymmetric weak-pinning superconducting channels: vortex ratchets
• AC-driven Vortices and the Hall Effect in a Superconductor with a Tilted Washboard Pinning Potential

Cited by in corpus (7)

• Abrikosov fluxonics in washboard nanolandscapes
• Reversible Ratchet Effects for Vortices in Conformal Pinning Arrays
• Frequency-dependent ratchet effect in superconducting films with a tilted washboard pinning potential
• Pinning effects on self-heating and flux-flow instability in superconducting films near $T_c$
• Vortex ratchet reversal in an asymmetric washboard pinning potential subject to combined dc and ac stimuli
• Vortex Guidance and Transport in Channeled Pinning Arrays
• Guided flux motion: models and experiment