N\'eel domain wall as a tunable filter for optically excited magnetostatic waves

TL;DR

This paper proposes a method to optically excite and filter spin waves in a ferromagnetic film using a Neel domain wall, with control achieved through laser pulse parameters and domain wall positioning, supported by micromagnetic simulations.

Contribution

It introduces a novel approach to tunable optical excitation and filtering of spin waves using a Neel domain wall in ferromagnetic films, demonstrated via micromagnetic simulations.

Findings

Laser pulse fluence and position influence spin wave frequencies.

Presence of the domain wall enables control over the spin wave spectrum.

The effects are explained by changes in spin wave dispersion.

Abstract

We present a concept of a tunable optical excitation of spin waves and filtering their spectra in a ferromagnetic film with 180$^{\circ}$ N\'eel domain wall. We show by means of micromagnetic simulation that the fluence of the femtosecond laser pulse and its position with respect to the domain wall affect the frequencies of the excited spin waves, and the presence of the domain wall plays crucial role in control of the spin waves' spectrum. The predicted effects are understood by analyzing the changes of the spin waves' dispersion under the impact of the laser pulse.