# Abrikosov vortex nucleation and its detrimental effect on superconducting spin pumping in Pt/Nb/Ni80Fe20/Nb/Pt proximity structures

## TL;DR

This study investigates how Abrikosov vortex formation in superconducting heterostructures under oblique magnetic fields impairs spin pumping efficiency, revealing the impact of vortex nucleation on superconducting spintronic devices.

## Contribution

It demonstrates the detrimental effect of vortex nucleation on superconducting spin pumping in Pt/Nb/Ni80Fe20 structures under oblique magnetic fields, linking vortex formation to suppression of superconducting spin transport.

## Key findings

- Spin pumping efficiency decreases with increasing out-of-plane field angle.
- Vortex nucleation correlates with the suppression of superconductivity.
- Superconducting volume becomes normal due to vortex formation at high field angles.

## Abstract

We report Abrikosov vortex nucleation in Pt/Nb/Ni80Fe20/Nb/Pt proximity-coupled structures under oblique ferromagnetic resonance (FMR) that turns out to be detrimental to superconducting spin pumping. By measuring an out-of-plane field-angle {\theta}H dependence and comparison with Pt-absent control samples, we show that as {\theta}H increases, the degree of enhancement (suppression) of spin pumping efficiency in the superconducting state for the Pt-present (Pt-absent) sample diminishes and it reverts to the normal state value at {\theta}H = 90{\deg}. This can be explained in terms of a substantial out-of-plane component of the resonance field for the Ni80Fe20 layer (with in-plane magnetization anisotropy and high aspect ratio) that approaches the upper critical field of the Nb, turning a large fraction of the singlet superconductor volume into the normal state.

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Source: https://tomesphere.com/paper/1902.03862