Phase-dependent Spin Polarization of Cooper Pairs in Magnetic Josephson Junctions

Abstract

Superconductor-Ferromagnet hybrid structures (SF) have attracted much interest in the last decades, due to a variety of interesting phenomena predicted and observed in these structures. One of them is the so-called inverse proximity effect. It is described by a spin polarization of Cooper pairs, which occurs not only in the ferromagnet (F), but also in the superconductor (S) yielding a finite magnetic moment $M_{\text{S}}$ inside the superconductor. This effect has been predicted and experimentally studied. However, interpretation of the experimental data is mostly ambiguous. Here, we study theoretically the impact of the spin polarized Cooper pairs on the Josephson effect in an SFS junction. We show that the induced magnetic moment $M_{\text{S}}$ does depend on the phase difference $\phi$ and therefore, will oscillate in time with the Josephson frequency $2eV/\hslash$ if the current exceeds a critical value. Most importantly, the spin polarization in the superconductor causes a significant change in the Fraunhofer pattern, which can be easily accessed experimentally.

References in corpus (46)

• Proximity effects in superconductor-ferromagnet heterostructures
• Odd Triplet Superconductivity and Related Phenomena in Superconductor-Ferromagnet Structures
• Coupling of two superconductors through a ferromagnet : evidence for a pi-junction
• Superconducting Spintronics
• A spin triplet supercurrent through the half-metallic ferromagnet CrO2
• Spin-polarized supercurrents for spintronics: a review of current progress
• Observation of spin-triplet superconductivity in Co-based Josephson Junctions
• Enhancement of the Josephson current by an exchange field in superconductor-ferromagnet structures
• Superconducting phase coherent electron transport in proximity conical ferromagnets
• Induced Ferromagnetism due to Superconductivity in Superconductor-Ferromagnet structures
• Optimization of spin-triplet supercurrent in ferromagnetic Josephson junctions
• Manifestation of triplet superconductivity in superconductor-ferromagnet structures
• Inverse proximity effect in superconductor-ferromagnet bilayer structures
• Reversible control of spin-polarised supercurrents in ferromagnetic Josephson junctions
• Interplay of Magnetic and Superconducting Proximity Effects in FSF Trilayers
• Long range spin supercurrents in ferromagnetic CrO${}_2$ using a multilayer contact structure
• Inverse proximity effect in superconductor-ferromagnet structures: From the ballistic to the diffusive limit
• Inhomogeneous magnetism induced in a superconductor at superconductor-ferromagnet interface
• Enhanced anti-ferromagnetic exchange between magnetic impurities in a superconducting host
• Spin screening of magnetic moments in superconductors
• Spin-valve Josephson junctions for cryogenic memory
• Minigap in superconductor-ferromagnet junctions with inhomogeneous magnetization
• Amplitude control of spin-triplet supercurrent in S/F/S Josephson junctions
• Electromagnetic proximity effect in planar superconductor-ferromagnet structures
• Supercurrent in ferromagnetic Josephson junctions with heavy metal interlayers
• Experimental Observation of the Inverse Proximity Effect in Superconductor/Ferromagnet Layered Structures
• Oscillations of Induced Magnetization in Superconductor-Ferromagnet Heterostructures
• Charge and Spin Currents in Ferromagnetic Josephson junctions
• Tuning of Magnetic Activity in Spin-Filter Josephson Junctions Towards Spin-Triplet Transport
• Josephson Currents and Spin Transfer Torques in Ballistic SFSFS Nanojunctions
• Proximity Induced Vortices and Long-Range Triplet Supercurrents in Ferromagnetic Josephson Junctions and Spin Valves
• Current-phase relations in SIsFS junctions in the vicinity of 0-$\pi$ transition
• Triplet superconductivity in a ferromagnetic vortex
• Pure Odd Frequency Superconductivity at the Cores of Proximity Vortices
• Spin polarization and orbital effects in superconductor-ferromagnet structures
• Electromagnetic proximity effect controlled by spin-triplet correlations in superconducting spin-valve structures
• Electrical control of magnetization in S/F/S junctions on a 3D topological insulator
• Critical Current Oscillations of Elliptical Josephson Junctions with Single-Domain Ferromagnetic Layers
• Long-range proximity effect for opposite-spin pairs in S/F heterostructures under non-equilibrium quasiparticle distribution
• Electrodynamics of Josephson junctions containing strong ferromagnets
• First order $0$ - $\pi$ phase transitions in superconductor/ferromagnet/superconductor trilayers
• Spectral Properties and Quantum Phase Transitions in Superconducting Junctions with a Ferromagnetic Link
• ${\theta }_0$ thermal Josephson junction
• Andreev levels as a quantum dissipative environment
• Voltage control of superconducting exchange interaction and anomalous Josephson effect
• Theory of a Weak-Link Superconductor-Ferromagnet Josephson Structure

Cited by in corpus (10)

• Magnetization dynamics in proximity-coupled superconductor/ferromagnet/superconductor multilayers
• Approaching to the deep-strong photon-to-magnon coupling
• Inverse magnetic hysteresis of the Josephson supercurrent: study of the magnetic properties of thin niobium/permalloy (Fe_{20}Ni_{80}) interfaces
• Nanoscale spin ordering and spin screening effects in tunnel ferromagnetic Josephson junctions
• Phase-Controllable Nonlocal Spin Polarization in Proximitized Nanowires
• Phase dynamics of tunnel Al-based ferromagnetic Josephson junctions
• Absence of magnetic interactions in Ni-Nb ferromagnet-superconductor bilayers
• Evidence of the inverse proximity effect in tunnel magnetic Josephson Junctions
• AC/DC spin current in ferromagnet/superconductor/normal metal trilayer systems
• A hybrid ferromagnetic transmon qubit: circuit design, feasibility and detection protocols for magnetic fluctuations