Observation of Periodic pi-Phase Shifts in Ferromagnet-Superconductor Multilayers

Abstract

We report complementary studies of the critical temperature and the critical current in ferromagnet (Ni) - superconductor (Nb) multilayers. The observed oscillatory behavior of both quantities upon variation of the thickness of the ferromagnetic layer is found to be in good agreement with theory. The length scale of oscillations is identical for both quantities and is set by the magnetic length corresponding to an exchange field of 200 meV in Ni. The consistency between the behavior of the two quantities provides strong evidence for periodic pi- phase shifts in these devices.

4 pages, 3 figures

References in corpus (14)

• Spintronics: Fundamentals and applications
• Proximity effects in superconductor-ferromagnet heterostructures
• Coupling of two superconductors through a ferromagnet : evidence for a pi-junction
• Long-range effects in superconductor-ferromagnet structures
• Theory of Half Metal-Superconductor Heterostructures
• Quantum Spin Fluctuations as a Source of Long-Range Proximity Effects in Diffusive Ferromagnet-Superconductor Structures
• Josephson current in superconductor-ferromagnet structures with a nonhomogeneous magnetization
• Oscillations of the superconducting critical current in Nb-Cu-Ni-Cu-Nb junctions
• Triplet proximity effect in FSF trilayers
• Interplay of Magnetic and Superconducting Proximity Effects in FSF Trilayers
• Effect of an inhomogeneous exchange field on the proximity effect in disordered superconductor-ferromagnet hybrid structures
• Characteristics of strong ferromagnetic Josephson junctions with epitaxial barriers
• Switching superconductivity in S/F bilayers by multiple-domain structures
• Alternative mechanism of the sign-reversal effect in superconductor-ferromagnet-superconductor Josephson junctions

Cited by in corpus (52)

• Spin-polarized supercurrents for spintronics: a review of current progress
• Critical Current Oscillations in Strong Ferromagnetic Pi-Junctions
• Symmetries of Pairing Correlations in Superconductor-Ferromagnet Nanostructures
• Cryogenic Memory Technologies
• Manifestation of the odd-frequency spin-triplet pairing state in diffusive ferromagnet / superconductor junctions
• Josephson tunnel junctions with strong ferromagnetic interlayer
• Critical Current Behavior in Josephson Junctions with the Weak Ferromagnet PdNi
• Odd spin-triplet superconductivity in a multilayered superconductor-ferromagnet Josephson junction
• Giant thermoelectric effects in a proximity-coupled superconductor-ferromagnet device
• Electronic transport through ferromagnetic and superconducting junctions with spin-filter tunneling barriers
• Spin-valve Josephson junctions for cryogenic memory
• Properties of tunnel Josephson junctions with a ferromagnetic interlayer
• Magnetization-control and transfer of spin-polarized Cooper pairs into a half-metal manganite
• 0-pi Transitions in a Superconductor/Chiral Ferromagnet/Superconductor Junction induced by a Homogeneous Cycloidal Spiral
• Ferromagnetic Materials for Josephson π Junctions
• Interaction of Josephson and magnetic oscillations in Josephson tunnel junctions with a ferromagnetic layer
• Josephson current in a superconductor -- ferromagnet -- superconductor junction with in-plane ferromagnetic domains
• Josephson $\phi$-junctions based on structures with complex normal/ferromagnet bilayer
• Theory of Josephson effect in unconventional superconducting junctions with diffusive barriers
• Phase Diagrams of Ferromagnet-Superconductor Multilayers with Misaligned Exchange Fields
• Proximity-induced density-of-states oscillations in a superconductor/strong-ferromagnet system
• Thermodynamics and Phase Diagrams of layered superconductor/ferromagnet nanostructures
• Planar graphene-NbSe${}_2$ Josephson junctions in a parallel magnetic field
• Current-voltage characteristics of tunnel Josephson junctions with a ferromagnetic interlayer
• Magnetic anisotropy in ferromagnetic Josephson junctions
• Scattering by magnetic and spin-orbit impurities and the Josephson current in superconductor-ferromagnet-superconductor junctions
• Critical Current Oscillations of Elliptical Josephson Junctions with Single-Domain Ferromagnetic Layers
• Superconductor-insulator-ferromagnet-superconductor Josephson junction: From the dirty to the clean limit
• Spin-triplet supercurrent in Josephson junctions containing a synthetic antiferromagnet with perpendicular magnetic anisotropy
• Role of magnetic scattering in 0-pi transitions in a superconductor/ferromagnetic metal/superconductor junction
• Magnetization induced by odd-frequency spin-triplet Cooper pairs in a Josephson junction with metallic trilayers
• First order $0$ - $\pi$ phase transitions in superconductor/ferromagnet/superconductor trilayers
• Magnetization Reversal by Tuning Rashba Spin-Orbit Interaction and Josephson Phase in a Ferromagnetic Josephson Junction
• Magnetic impurities in a superconductor: Effect of domain walls and interference
• Ferromagnetic Josephson junctions for cryogenic memory
• Josephson effect in SIFS-tunnel junctions with domain walls in weak link region
• Anomalous current-voltage characteristics of SFIFS Josephson junctions with weak ferromagnetic interlayers
• Pt and CoB trilayer Josephson $\pi$ junctions with perpendicular magnetic anisotropy
• Supergap and subgap enhanced currents in asymmetric {S_1FS_2} Josephson junctions
• Absence of magnetic interactions in Ni-Nb ferromagnet-superconductor bilayers
• Tunable ground states in helical $p$-wave Josephson junctions
• Chirality and spin transformation of triplet Cooper pairs upon interaction with singlet condensate
• Josephson effect in multi-terminal superconductor-ferromagnet junctions coupled via triplet components
• Magnetic field-controlled 0-$\pi$ transitions and their experimental signatures in superconductor-ferromagnet-superconductor junctions
• Theoretical study of magnetism induced by proximity effect in a ferromagnetic Josephson junction with a normal metal
• Sign reversal of ac Josephson current in a ferromagnetic Josephson junction
• Gate-dependent spin-torque in a nanoconductor-based spin-valve
• Comparison of NiFeCr and NiFe in ferromagnetic Josephson junctions
• Demonstration of 0-pi transition in Josephson junctions containing unbalanced synthetic antiferromagnets
• Giant oscillatory Gilbert damping in superconductor/ferromagnet/superconductor junctions
• Proximity Effect in Superconducting-Ferromagnetic Granular Structures
• Diamond-shaped evolution of the superconducting interference pattern in NbTiN weak-link Josephson junctions