# Magnetodynamics in exchange coupled composite magnets

## TL;DR

This paper explores how laser pulses affect magnetization in composite magnets, revealing ultrafast changes in magnetic properties.

## Contribution

The study reveals sub-picosecond magnetization dynamics in FeNi/FePt composites using element-specific ultrafast spectroscopy.

## Key findings

- Ultrafast demagnetization and magnetization reorientation occur within 500 fs in FeNi/FePt composites.
- Element-specific contributions from Ni and Pt are observed using core-resonant tr-MOKE spectroscopy.
- Magnetodynamics arise from spin disordering and dynamic interlayer exchange coupling.

## Abstract

Tailoring magnetization using all-optical methods in exchange-coupled composite magnets holds significant scientific potential for advancing ultrafast magneto-optic devices. Here, we investigate the femtosecond laser-activated magnetization dynamics in FeNi/FePt composites using time-resolved magneto-optical Kerr effect (tr-MOKE) spectroscopy across the both visible and extreme ultraviolet spectral ranges. Observations from visible tr-MOKE reveal ultrafast demagnetization and an initial magnetization reorientation, characterized by a transient increase in the in-plane magnetization vector occurring on timescales shorter than 500 fs. Core-resonant tr-MOKE at Ni, Fe \documentclass[12pt]{minimal}
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\begin{document}$$\hbox {N}_{6,7}$$\end{document}-edge provide an element-specific contribution to the magnetodynamics. We infer that the sub picosecond magnetodynamics arises from the interplay between spin disordering and the dynamic nature of interlayer exchange coupling between FeNi and FePt in FeNi/FePt.