Reverse magnetic vortex curling direction of ferromagnetic nanodisk

TL;DR

This paper demonstrates a method to reverse the magnetic vortex curling direction in ferromagnetic nanodisks using a circular Oersted field generated by a focused current, combining experimental and simulation approaches.

Contribution

It introduces a novel technique to control vortex chirality in nanodisks by applying a centered line current, validated through experiments and micromagnetic simulations.

Findings

Reversal of vortex chirality achieved experimentally.

Centered line current more effective than uniform current.

Simulation supports experimental observations.

Abstract

We reverse the magnetic vortex curling direction of ferromagnetic nanodisk by applying a circular Oersted field. The nanodisk is fabricated without breaking its symmetry. The Oersted field is induced by passing current through an atomic force microscope tip placed at the center of the disk. Micromagnetic simulation indicates that compared to the uniformly distributed current throughout the cross section of disk, the line current concentrated in the center can reverse the chirality more easily, which is in accordance with our experimental results.