# Generation of single skyrmions by picosecond magnetic field pulses

## TL;DR

This paper presents a numerical method to generate single skyrmions rapidly in ferromagnetic materials using picosecond magnetic field pulses, with potential applications in skyrmion-based devices.

## Contribution

The study introduces a novel ultrafast technique for skyrmion creation via magnetic pulses, considering sample size and field uniformity effects.

## Key findings

- Single skyrmions can be generated in ferromagnets with picosecond pulses.
- Nonuniform localized fields are more effective for large samples.
- A phase diagram of pulse parameters for skyrmion nucleation is provided.

## Abstract

We numerically demonstrate an ultrafast method to create $\textit{single}$ skyrmions in a $\textit{collinear}$ ferromagnetic sample by applying a picosecond (effective) magnetic field pulse in the presence of Dzyaloshinskii-Moriya interaction. For small samples the applied magnetic field pulse could be either spatially uniform or nonuniform while for large samples a nonuniform and localized field is more effective. We examine the phase diagram of pulse width and amplitude for the nucleation. Our finding could ultimately be used to design future skyrmion-based devices.