Spin-orbit driven superconducting proximity effects in Pt/Nb thin films.
Machiel Flokstra1, Rhea Stewart1,2, Chi-Ming Yim1,3
1School of Physics and Astronomy, SUPA, University of St. Andrews, St. Andrews, UK.
Nature Communications
|August 21, 2023
Summary
Researchers explored novel superconducting spintronic devices, creating spin-triplet correlations without ferromagnets. This work advances dissipationless spin current generation using spin-orbit coupling in hybrid structures.
Area of Science:
- Condensed Matter Physics
- Spintronics
- Superconductivity
Background:
- Dissipationless spin currents are crucial for spintronic devices.
- Current methods often rely on ferromagnetic materials to induce spin-triplet correlations in superconductors.
- Exploring alternative, non-ferromagnetic approaches is essential for advancing superconducting spintronics.
Purpose of the Study:
- To investigate simple hybrid structures capable of generating spin-triplet correlations without ferromagnetic elements.
- To understand the underlying mechanisms of spin-triplet generation in these novel structures.
- To demonstrate a new route for creating dissipationless spin currents in superconducting spintronics.
Main Methods:
- Fabrication of hybrid structures combining superconducting materials.
- Utilizing scanning tunneling spectroscopy (STS) to probe local electronic properties.
- Employing muon-spin rotation (µSR) to investigate magnetic properties.
Main Results:
- Demonstrated the generation of spin-triplet correlations without ferromagnetic materials.
- Observed a paramagnetic contribution to magnetization that counteracts Meissner screening.
- Confirmed that the spin-orbit generated magnetization originates from the spin of equal-spin pairs, not orbital motion.
Conclusions:
- A novel method for generating spin-triplet correlations in superconducting spintronics has been developed.
- Spin-orbit coupling plays a key role in generating magnetization in these hybrid structures.
- This research offers a significant advancement for the field of superconducting spintronics and dissipationless spin currents.
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