Chiral Magnetic Skyrmions with Arbitrary Topological Charge ("skyrmionic sacks")

TL;DR

This paper demonstrates the theoretical existence of an infinite variety of stable chiral magnetic skyrmions with arbitrary topological charge in various magnetic materials, expanding the understanding of topological solitons.

Contribution

It introduces a general model predicting stable skyrmions with any topological charge, detailing their morphology and energy, applicable to many chiral magnetic materials.

Findings

Infinite stable skyrmions with arbitrary topological charge identified.

Detailed morphology and energy dependencies provided.

Applicable to various chiral magnetic materials.

Abstract

We show that continuous and spin-lattice models of chiral ferro- and antiferromagnets provide the existence of an infinite number of stable soliton solutions of any integer topological charge. A detailed description of the morphology of new skyrmions and the corresponding energy dependencies are provided. The considered model is general, and is expected to predict a plethora of particle-like states which may occur in various chiral magnets including atomic layers, e.g., PdFe/Ir(111), rhombohedral GaV$_4$S$_8$ semiconductor, B20-type alloys as Mn$_{1-x}$Fe$_x$Ge, Mn$_{1-x}$Fe$_x$Si, Fe$_{1-x}$Co$_x$Si, Cu$_2$OSeO$_3$, acentric tetragonal Heusler compounds.