Chirality-mediated bistability and strong frequency downshifting of the gyrotropic resonance of a magnetic vortex due to dynamic destiffening

Manu Sushruth, Jasper P. Fried, Abdelmadjid Anane, Stephane Xavier, Cyrile Deranlot, Vincent Cros, Peter J. Metaxas

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We demonstrate an enhanced, bidirectional, in-plane magnetic field tuning of the gyrotropic resonance frequency of a magnetic vortex within a ferromagnetic 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.

Original languageEnglish
Article number060405
Number of pages5
JournalPhysical Review B: Covering condensed matter and materials physics
Volume96
Issue number6
DOIs
Publication statusPublished - 7 Aug 2017

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