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 (DOS) in bilayers of a textured magnetic insulator in proximity to a superconductor. Using quasiclassical Green function methods, we study the local DOS, 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.
Highlights
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
The active development of superconducting spintronics, caloritronics and spin caloritronics raised a tremendous interest in hybrid structures of superconductors and textured ferromagnets
Summary
The active development of superconducting spintronics, caloritronics and spin caloritronics raised a tremendous interest in hybrid structures of superconductors and textured ferromagnets. The influence of the domain structure on the positionaveraged superconducting DOS in S/FI bilayer was studied experimentally and theoretically[30]. We determine the characteristic spatial and energy dependence of the spin-dependent density of states, which allows to Konstanzer Online-Publikations-System (KOPS) URL: http://nbn-resolving.de/urn:nbn:de:bsz:352-2-1q37hifp3dxws[6] tomographically extract the structure of the spin-triplet Cooper pairs. The local density of states reflects that the different spin-triplet Cooper pairs have different spatial structure and one can produce in this way a one-dimensional spin-carrying band along the domain wall. We illustrate how a spinpolarized tunneling signal can be connected to the spin structure of the Cooper pairs
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