Magnetic skyrmion generation by reflective spin-wave focusing

TL;DR

This paper introduces a novel method to generate magnetic skyrmions by focusing reflected spin waves using a curved edge, verified through simulations, with potential applications in spintronic device design.

Contribution

The study presents a new approach for skyrmion generation utilizing reflective spin-wave focusing on a parabolic edge, combining theoretical derivation and micromagnetic simulations.

Findings

Magnetic droplet forms at the focal point with enhanced spin-wave intensity.

Skyrmions are generated through a topological charge change near the focus.

A phase diagram for skyrmion creation based on amplitude and frequency is provided.

Abstract

We propose a method to generate magnetic skyrmions by focusing spin waves totally reflected by a curved film edge. Based on the principle of identical magnonic path length, we derive the edge contour that is parabolic and frequency-independent. Micromagnetic simulations are performed to verify our theoretical design. It is found that under proper conditions, magnetic droplet first emerges near the focal point where the spin-wave intensity has been significantly enhanced, and then converts to magnetic skyrmion accompanied by a change of the topological charge. The phase diagram about the amplitude and frequency of the driving field for skyrmion generation is obtained. Our finding would be helpful for the designment of spintronic devices combing the advantage of skyrmionics and magnonics.