Anomalous polarization-dependent transport in nanoscale double-barrier superconductor/ferromagnet/superconductor junctions

Abstract

We study the transport properties of nanoscale superconducting (S) devices in which two superconducting electrodes are bridged by two parallel ferromagnetic (F) wires, forming an SFFS junction with a separation between the two wires less than the superconducting coherence length. This allows crossed Andreev reflection to take place. We find that the resistance as a function of temperature exhibits behavior reminiscent of the re-entrant effect and, at low temperatures and excitation energies below the superconducting gap, the resistance corresponding to antiparallel alignment of the magnetization of the ferromagnetic wires is higher than that of parallel alignment, in contrast to the behavior expected from crossed Andreev reflection. We present a model based on spin-dependent interface scattering that explains this surprising result and demonstrates the sensitivity of the junction transport properties to interfacial parameters.

5 pages, 3 figures

References in corpus (6)

• A spin triplet supercurrent through the half-metallic ferromagnet CrO2
• Evidence for crossed Andreev reflection in superconductor-ferromagnet hybrid structures
• Manifestation of the odd-frequency spin-triplet pairing state in diffusive ferromagnet / superconductor junctions
• Contact resistance dependence of crossed Andreev reflection
• Andreev reflection at half-metal-superconductor interfaces with non-uniform magnetization
• Nonlocal conductance via overlapping Andreev bound states in ferromagnet-superconductor heterostructures

Cited by in corpus (12)

• Spin-polarized supercurrents for spintronics: a review of current progress
• Zero Energy Peak and Triplet Correlations in Nanoscale SFF Spin-Valves
• Quantized Josephson phase battery
• General framework for transport in spin-orbit-coupled superconducting heterostructures: Nonuniform spin-orbit coupling and spin-orbit-active interfaces
• Theory of Andreev Bound States in S-F-S Junctions and S-F Proximity Devices
• Transport in multi-terminal superconductor/ferromagnet junctions having spin-dependent interfaces
• Non-collinear Andreev reflections in semiconductor nanowires
• Charge transfer statistics of transport through Majorana bound states
• P-wave Cooper pair splitting
• Magnetism induced by nonlocal spin-entangled electrons in a superconducting spin-valve
• Spin flip scattering engendered quantum spin torque in a Josephson junction
• Long-range superharmonic Josephson current and spin-triplet pairing correlations in a junction with ferromagnetic bilayers