Signatures of spin-triplet Cooper pairing in the density of states of spin-textured superconductor-ferromagnet bilayers

Abstract

The existence of spin-triplet superconductivity in non-collinear magnetic heterostructures with superconductors is by now well established. This observation lays the foundation of superconducting spintronics with the aim to create a low-power consuming devices in order to replace the conventional electronics limited by heating. From a fundamental point of view the investigation of the structure and properties of spin-triplet Cooper pairs continues. Recently, spectroscopic evidence has shown to offer more detailed insights in the structure of triplet Cooper pairs than the supercurrent. Hence, we study here the structure of spin-triplet Cooper pairs through the density of states in bilayers of a textured magnetic insulator in proximity to a superconductor. Using quasiclassical Green function methods, we study the local density of states, both spin-resolved and spin-independent. We show that the equal-spin and mixed-spin triplet Cooper pairs leads to different spectroscopic signatures, which can be further enhanced by spin-polarized spectroscopy. Our results show the huge potential spin-polarized tunneling methods offer in characterizing unconventional superconductivity in heterostructures.

12 pages, 13 figures

References in corpus (11)

• A spin triplet supercurrent through the half-metallic ferromagnet CrO2
• Nonlocal Thermoelectric Effects and Nonlocal Onsager Relations in a Three-Terminal Proximity-Coupled Superconductor-Ferromagnet Device
• Signature of magnetic-dependent gapless odd frequency states at superconductor/ferromagnet interfaces
• Revealing the magnetic proximity effect in EuS/Al bilayers through superconducting tunneling spectroscopy
• Superconductors as ideal spin sources for spintronics
• Theory of superconducting and magnetic proximity effect in S$\mid$F structures with inhomogeneous magnetization textures and spin-active interfaces
• Proposal for a phase-coherent thermoelectric transistor
• Very large thermophase in ferromagnetic Josephson junctions
• Magnetoelectric Andreev effect due to proximity-induced non-unitary triplet superconductivity in helical metals
• Quantum interference hybrid spin-current injector
• Huge nonequilibrium magnetoresistance in hybrid superconducting spin valves

Cited by in corpus (4)

• Quasiparticle density of states and triplet correlations in superconductor/ferromagnetic-insulator structures across a sharp domain wall
• Magnon influence on the superconducting density of states in superconductor$-$ferromagnetic-insulator bilayers
• Spin-split superconductivity in spin-orbit coupled hybrid nanowires with ferromagnetic barriers
• Odd-frequency Pairing in Josephson Junctions Coupled by Magnetic Textures