# Modeling ultrafast all-optical switching in synthetic ferrimagnets

## TL;DR

This paper uses numerical simulations to show that synthetic ferrimagnets can undergo thermally induced magnetic switching, with the process depending on composition and temperature but not on total thickness.

## Contribution

It demonstrates thermally induced magnetic switching in synthetic ferrimagnets and explains the temperature dependence of the reversal process.

## Key findings

- Deterministic magnetization reversal occurs above a threshold temperature.
- Switching depends on the ratio of transition metal to rare-earth atoms.
- Total multilayer thickness has little effect on switching occurrence.

## Abstract

Based on numerical simulations, we demonstrate thermally induced magnetic switching in synthetic ferrimagnets composed of multilayers of rare-earth and transition metals. Our findings show that deterministic magnetization reversal occurs above a certain threshold temperature if the ratio of transition metal atoms to rare-earth atoms is sufficiently large. Surprisingly, the total thickness of the multilayer system has little effect on the occurence of switching. We further provide a simple argument to explain the temperature dependence of the reversal process.