Control of vortex chirality in a symmetric ferromagnetic ring using ferromagnetic nanoelement

TL;DR

This paper presents a theoretical method to control vortex chirality in symmetric ferromagnetic nanorings by inserting an elongated nanoelement, influencing domain wall movement without breaking the ring's symmetry, with potential applications in spintronics.

Contribution

The study introduces a novel approach to control vortex chirality in nanorings by using an internal nanoelement, avoiding the need to break the ring's symmetry.

Findings

Chirality can be controlled without symmetry breaking.

Stray magnetostatic field influences domain wall movement.

Applicable to dense nanoring arrays for spintronic devices.

Abstract

Controlling the vortex chirality in ferromagnetic nanodots and nanorings has been a topic of investigation for the last few years. Many control methods have been proposed and it has been found that the control is related to the breaking of the circular symmetry. In this paper, we present a theoretical study demonstrating the control of chirality in ferromagnetic nanoring without directly breaking its symmetry, but instead by placing elongated ferromagnetic nanoelement inside the ring, Here, the stray magnetostatic field exerted by the asymmetrically placed nanoelement determines the movement of the domain walls upon remagnetization of the nanoring and the resulting chirality in the remanence. This approach allows the chirality of the vortex state to be controlled and also promises its control in a dense array of nanorings, thus suitable for spintronic and magnonic applications.