# Spin currents driven by the Higgs mode in magnetic superconductors

## TL;DR

This paper explores how the Higgs mode in magnetic superconductors can generate spin currents that are detectable electrically and magnetically, opening new avenues in superconducting optospintronics.

## Contribution

It demonstrates the coupling of the Higgs mode to spin degrees of freedom in magnetic superconductors and proposes methods for electrical and magnetic detection of this mode.

## Key findings

- Higgs mode induces time-dependent spin currents in magnetic superconductors.
- Spin currents can be converted to electrical signals via spin-filtering.
- Magnetic precession can generate the Higgs mode, enabling reciprocal detection.

## Abstract

Higgs mode in superconducting materials describes slowly-decaying oscillations of the order parameter amplitude. We demonstrate that in magnetic superconductors with built-in spin-splitting field Higgs mode is strongly coupled to the spin degrees of freedom allowing for the generation of time-dependent spin currents. Converting such spin currents to electric signals by spin-filtering elements provides a tool for the second-harmonic generation and the electrical detection of the Higgs mode generated by the external irradiation. The non-adiabatic spin torques generated by these spin currents allow for the magnetic detection of the Higgs mode by measuring the precession of magnetic moment in the adjacent ferromagnet. We discuss also the reciprocal effect which is the generation of the Higgs mode by the magnetic precession. Coupling the collective modes in superconductors to light and magnetic dynamics opens the new direction of superconducting optospintronics.