# Chirality-mediated bistability and strong frequency downshifting of the gyrotropic resonance of a dynamically de-stiffened magnetic vortex

## TL;DR

This paper shows how introducing a flat edge in a magnetic vortex disk enables enhanced, bidirectional tuning of gyrotropic resonance frequencies, revealing chirality-dependent bistability and significant frequency downshifting.

## Contribution

It introduces a flat edge to control and enhance the gyrotropic resonance tuning and reveals chirality-mediated bistability in magnetic vortices.

## Key findings

- Range of gyrotropic frequencies more than doubled
- Chirality-dependent bistability observed
- Significant frequency downshifting achieved

## Abstract

We demonstrate an enhanced, bidirectional, in-plane magnetic field tuning of the gyrotropic resonance frequency of a magnetic vortex within a disk by introducing a flat edge. When the core is in its vicinity, the flat edge locally reduces the core's directional dynamic stiffness for movement parallel to the edge. This strongly reduces the net dynamic core stiffness, leading to the gyrotropic frequency being significantly less than when the core is centered (or located near the round edge). This leads to the measurable range of gyrotropic frequencies being more than doubled and also results in a clear chirality-mediated bistability of the gyrotropic resonance frequency due to what is effectively a chirality-dependence of the core's confining potential.