# Formation of quasi-solitons in transverse confined ferromagnetic film media

## TL;DR

This paper investigates the formation of quasi-solitons in transverse confined ferromagnetic films, revealing how confinement influences spin-wave waveforms and their stability through experimental and numerical methods.

## Contribution

It demonstrates the formation and behavior of quasi-solitons in confined ferromagnetic films, combining experimental observations with numerical simulations.

## Key findings

- Confinement reduces dynamic magnetization amplitude at stripe edges.
- A new stable spin wave packet propagates in the nonlinear regime.
- Waveform shape and behavior are strongly affected by confinement.

## Abstract

The formation of quasi-2D spin-wave waveforms in longitudinally magnetized stripes of ferrimagnetic film was observed by using time- and space-resolved Brillouin light scattering technique. In the linear regime it was found that the confinement decreases the amplitude of dynamic magnetization near the lateral stripe edges. Thus, the so-called effective dipolar pinning of dynamic magnetization takes place at the edges. In the nonlinear regime a new stable spin wave packet propagating along a waveguide structure, for which both transversal instability and interaction with the side walls of the waveguide are important was observed. The experiments and a numerical simulation of the pulse evolution show that the shape of the formed waveforms and their behavior are strongly influenced by the confinement.