Emergence of Triplet Correlations in Superconductor/Half Metallic Nanojunctions with Spin Active Interfaces

Abstract

We study triplet pairing correlations induced in an SFS trilayer (where F is a ferromagnet and S an ordinary s-wave superconductor) by spin flip scattering at the interfaces. We derive and solve self consistently the appropriate Bogoliubov-de Gennes equations in the clean limit. We find that the spin flip scattering generates $m=\pm 1$ triplet correlations, odd in time. We study the general spatial behavior of these and of $m=0$ correlations as a function of position and of spin-flip strength, $H_{spin}$. We concentrate on the case where the ferromagnet is half-metallic. We find that for certain values of $H_{spin}$, the triplet correlations pervade the magnetic layer and can penetrate deeply into the superconductor. The behavior we find depends very strongly on whether the singlet order parameter is in the 0 or $\pi$ state, which must in turn be determined self-consistently. We also present results for the density of states (DOS) and for the local magnetization, which, due to spin-flip processes, is not in general aligned with the magnetization of the half metal, and near the interfaces, rotates as a function of position and $H_{spin}$. The average DOS in both F and S is shown to exhibit various subgap bound states positioned at energies that depend strongly on the particular junction state and the spin

14 pages including figures (some compressed). Good quality figures available from authors

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Cited by in corpus (18)

• Spin-polarized supercurrents for spintronics: a review of current progress
• General Boundary Conditions for Quasiclassical Theory of Superconductivity in the Diffusive Limit: Application to Strongly Spin-polarized Systems
• Half-Metallic Superconducting Triplet Spin Valve
• Long-range spin-triplet proximity effect in Josephson junctions with multilayered ferromagnets
• Half-Metallic Superconducting Triplet Spin MultiValves
• 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
• Spin Controlled Coexistence of 0 and π States in SFSFS Josephson Junctions
• Reentrant superconductivity in conical-ferromagnet/superconductor nanostructures
• Proximity Effects in Conical-Ferromagnet/Superconductor bilayers
• Tunneling Conductance and Spin Transport in Clean Ferromagnet-Ferromagnet-Superconductor Heterostructures
• Theory of Andreev Bound States in S-F-S Junctions and S-F Proximity Devices
• Transport in Ferromagnet/Superconductor spin valves
• Thermoelectricity carried by proximity-induced odd-frequency pairing in ferromagnet/superconductor junctions
• Spin current and spin transfer torque in ferromagnet/superconductor spin valves
• Anomalous supercurrent modulated by interfacial magnetizations in Josephson junctions with ferromagnetic bilayers
• Stealth Majorana Zero Mode in a Trilayer Heterostructure MnTe/Bi2Te3/Fe(Te,Se)
• First-principles calculations of spin-triplet andreev reflection spectra at half-metallic ferromagnet/superconductor interface