Interface engineering of spin triplet Cooper pairs for spin-valve implementation
Abstract
Spin singlet Cooper pairs can be converted into equal-spin triplet pairs at a superconductor/heavy-metal interface under suitable conditions. Under current carrying conditions, these triplet correlations can give rise to a non equilibrium spin moment in the heavy metal through the predicted supercurrent spin-Hall effect. Here we demonstrate that this current induced triplet spin moment, in conjunction with the magnetic moment of a ferromagnetic layer, can enable a magnetic spin-valve response in Nb/Pt/Ni/Pt/Nb vertical nano-devices. The magnitude of this spin-valve effect depends on the efficiency of singlet-triplet Cooper pair conversion at the Nb/Pt interface. In order to facilitate efficient triplet generation, we deliberately introduced interfacial roughness to introduce finite Rashba spin-orbit coupling at the Nb/Pt interface and an out-of-plane component of magnetic moment at the Ni interface. In contrast, no discernible spin-valve response was observed in devices with smooth interfaces within measurement resolutions. Since the magnetic moment of the Ni layer and the current-induced triplet spin moment in the Pt layer are independently switchable using a magnetic field and bias current, respectively, the spin valve can be controlled via either parameters. These results demonstrates a novel approach to directly utilizing the spin polarized triplet Copper pairs in superconducting spintronic applications.
Related
- Chemical Perspectives on Cuprate Superconductivity: Hole-Protected Spin Dimers as d Wave Cooper Pairs
- Stabilizing fluctuating Cooper pairs with a terahertz resonator
- Why Cooper pairs live in AdS2: a spectral analysis of the Yukawa-SYK model
- Electrostatic Stabilization of Near-Surface Quantum Sensors via Dielectric Interface Engineering
- Growth and Interface Engineering of Superconducting TiN on Sapphire by Thermal-Laser Epitaxy
BibTeX
@misc{nayak2026interface,
title = {{Interface engineering of spin triplet Cooper pairs for spin-valve implementation}},
author = {Debashree Nayak and Abhisek Sahoo and Pratap Kumar Sahoo and Kartik Senapati},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.24803},
eprint = {2609.24803},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.24803},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Interface engineering of spin triplet Cooper pairs for spin-valve implementation
AU - Debashree Nayak
AU - Abhisek Sahoo
AU - Pratap Kumar Sahoo
AU - Kartik Senapati
PY - 2026
DA - 2026/09/26
PB - arXiv
DO - 10.48550/arxiv.2609.24803
UR - https://arxiv.org/abs/2609.24803
AB - Spin singlet Cooper pairs can be converted into equal-spin triplet pairs at a superconductor/heavy-metal interface under suitable conditions. Under current carrying conditions, these triplet correlations can give rise to a non equilibrium spin moment in the heavy metal through the predicted supercurrent spin-Hall effect. Here we demonstrate that this current induced triplet spin moment, in conjunction with the magnetic moment of a ferromagnetic layer, can enable a magnetic spin-valve response in Nb/Pt/Ni/Pt/Nb vertical nano-devices. The magnitude of this spin-valve effect depends on the efficiency of singlet-triplet Cooper pair conversion at the Nb/Pt interface. In order to facilitate efficient triplet generation, we deliberately introduced interfacial roughness to introduce finite Rashba spin-orbit coupling at the Nb/Pt interface and an out-of-plane component of magnetic moment at the Ni interface. In contrast, no discernible spin-valve response was observed in devices with smooth interfaces within measurement resolutions. Since the magnetic moment of the Ni layer and the current-induced triplet spin moment in the Pt layer are independently switchable using a magnetic field and bias current, respectively, the spin valve can be controlled via either parameters. These results demonstrates a novel approach to directly utilizing the spin polarized triplet Copper pairs in superconducting spintronic applications.
ER -