Skyrmion Emergence via Domain Wall Anchoring through Vertical Bloch Line

TL;DR

This paper presents a new method for generating skyrmions via domain wall deformation driven by vertical Bloch lines, supported by analytical and micromagnetic simulations, advancing spintronic device control.

Contribution

It introduces a novel skyrmion creation mechanism through domain wall deformation and classifies conditions for robust skyrmion generation in DMI systems.

Findings

Skyrmions can be generated from domain wall deformation exceeding the Walker threshold.

Vertical Bloch lines facilitate skyrmion emergence through domain wall anchoring.

The study provides a classification of domain wall distortions leading to skyrmion formation.

Abstract

Skyrmions, topologically stable magnetic solitons characterized by whirling magnetization in nanoscale magnetic elements, show promise information carriers in spintronics and spin-based quantum computing due to their unique properties: small size, stability, and controllability. In this study, we introduce a novel method of skyrmion generation through domain wall deformation dynamics. Our analytical and micromagnetic simulations demonstrate that domain wall motion exceeding the Walker threshold induces topological deformation of magnetic domain walls exhibiting Dzyaloshinskii-Moriya interaction. This deformation process catalyzes the emergence of skyrmions from magnetic domain wall structure distortion, specifically through the Anchoring of domain walls due to the vertical Bloch line. We elucidate the underlying mechanism of skyrmion generation, correlating it with topological transitions accompanied by burst energy dissipation through spin-wave radiation. Notably, we present robust skyrmion generation conditions through a comprehensive classification of domain wall distortion, including vertical Bloch line generation and annihilation in magnetic domain wall dynamics within a DMI system. These findings provide noble insights into topological behaviors of spin structures and offer a potential pathway for efficient, controlled skyrmion creation in the next-generation spintronic devices.