Low-T_c Josephson junctions with tailored barrier
arXiv:cond-mat/0612164 · doi:10.1063/1.2655487
Abstract
Nb/Al_2O_3/Ni_{0.6}Cu_{0.4}/Nb based superconductor-insulator-ferromagnet-superconductor (SIFS) Josephson tunnel junctions with a thickness step in the metallic ferromagnetic \Ni_{0.6}\Cu_{0.4} interlayer were fabricated. The step was defined by optical lithography and controlled etching. The step height is on the scale of a few angstroms. Experimentally determined junction parameters by current-voltage characteristics and Fraunhofer pattern indicate an uniform F-layer thickness and the same interface transparencies for etched and non-etched F-layers. This technique could be used to tailor low-T_c Josephson junctions having controlled critical current densities at defined parts of the junction area, as needed for tunable resonators, magnetic-field driven electronics or phase modulated devices.
6 pages, 6 figures, small changes, to be published by JAP
References in corpus (11)
- Proximity effects in superconductor-ferromagnet heterostructures
- Oscillations of the superconducting critical current in Nb-Cu-Ni-Cu-Nb junctions
- 0-pi Josephson tunnel junctions with ferromagnetic barrier
- High quality ferromagnetic 0 and pi Josephson tunnel junctions
- Dynamics of semifluxons in Nb long Josephson 0-pi junctions
- Spontaneous Flux and Magnetic Interference Patterns in 0-pi Josephson Junctions
- Semi-fluxons in long Josephson 0-pi-junctions
- Ground state and bias current induced rearrangement of semifluxons in 0-pi long Josephson junctions
- Quantum tunneling of semifluxons
- Analytical analysis of ground states on 0- long Josephson junctions
- Ferromagnetic 0-pi Junctions as Classical Spins
Cited by in corpus (18)
- Experimental evidence of a ϕ Josephson junction
- Josephson tunnel junctions with strong ferromagnetic interlayer
- Memory cell based on a Josephson junction
- Static and dynamic properties of 0, pi, and 0-pi ferromagnetic tunnel Josephson Junctions
- Properties of tunnel Josephson junctions with a ferromagnetic interlayer
- Magnetic interference patterns in 0-Pi SIFS Josephson junctions: effects of asymmetry between 0 and Pi regions
- Josephson magnetic rotary valve
- Josephson Coupling and Fiske Dynamics in Ferromagnetic Tunnel Junctions
- Current-voltage characteristics of tunnel Josephson junctions with a ferromagnetic interlayer
- Magnetic anisotropy in ferromagnetic Josephson junctions
- Tunable Josephson Junction ratchet
- Ferromagnetic 0-pi Josephson junctions
- Interference patterns of multifacet 20x(0-pi-) Josephson junctions with ferromagnetic barrier
- Critical current diffraction pattern of SIFS Josephson junctions with step-like F-layer
- Anomalous current-voltage characteristics of SFIFS Josephson junctions with weak ferromagnetic interlayers
- Magnetic field dependence of the critical current in YBa_2Cu_3O_{7-δ}/Au/Nb ramp-zigzag Josephson junctions
- Josephson junctions with centered step and local variation of critical current density
- Mobile kinks and half-integer zero-field-like steps in highly discrete alternating Josephson junction arrays