Vortex-antivortex pairs induced by curvature in toroidal nanomagnets

TL;DR

This paper demonstrates that the curvature of toroidal nanomagnets can induce stable vortex-antivortex pairs, revealing a new method to generate topological magnetic textures through geometric design.

Contribution

It introduces the concept that curvature-induced chiral interactions can produce stable vortex-antivortex pairs in toroidal nanomagnets, a novel approach in nanomagnetism.

Findings

Curvature induces chiral magnetic textures in nanomagnets.

Vortex-antivortex pairs are stable remanent states in toroidal geometries.

Curvature-controlled topological magnetic configurations can be engineered.

Abstract

We show that the curvature of nanomagnets can be used to induce chiral textures in the magnetization field. Among the phenomena related to the interplay between geometry and magnetic behavior at nanomagnets, an effective curvature-induced chiral interaction has been recently predicted. In this work, it is shown that a magnetization configuration consisting of two structures with opposite winding numbers (vortex and antivortex) appear as remanent states in hollow toroidal nanomagnets. It is shown that these topological configurations are a result of a chiral interaction induced by curvature. In this way, the obtained results present a new form to produce stable vortices and antivortices by using nanomagnets with variable curvature.