# Efficient all-optical helicity dependent switching of spins in a Pt/Co/Pt film by a dual-pulse excitation

## TL;DR

This paper demonstrates a dual-pulse laser technique to achieve efficient all-optical helicity dependent switching of spins in a Pt/Co/Pt film, significantly reducing the number of pulses needed for magnetization reversal.

## Contribution

It introduces a dual-pulse excitation method that reduces the required laser pulses for AO-HDS in ferromagnetic metals, enhancing efficiency.

## Key findings

- Magnetization reversal achieved with only 4 pulse pairs.
- Dual-pulse approach reduces energy and time for switching.
- Potential for practical applications in spintronics.

## Abstract

All-optical helicity dependent switching (AO-HDS), deterministic control of magnetization by circularly polarized laser pulses, allows to efficiently manipulate spins without the need of a magnetic field. However, AO-HDS in ferromagnetic metals so far requires many laser pulses for fully switching their magnetic states. Using a combination of a short, 90-fs linearly polarized pulse and a subsequent longer, 3-ps circularly polarized pulse, we demonstrate that the number of pulses for full magnetization reversal can be reduced to 4 pulse pairs in a single stack of Pt/Co/Pt. The obtained results suggest that the dual-pulse approach is a potential route towards realizing efficient AO-HDS in ferromagnetic metals.

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Source: https://tomesphere.com/paper/1903.01941