Spin Vortex Resonance in Non-planar Ferromagnetic Dots

TL;DR

This study investigates how non-planar ferromagnetic dots exhibit unique vortex resonance behaviors influenced by their topography, revealing controllable resonance frequencies through magnetic field application and micromagnetic simulations.

Contribution

It introduces the analysis of vortex resonance in non-planar ferromagnetic dots, highlighting the effects of topography on dynamic magnetic responses and resonance controllability.

Findings

Two distinct resonance frequency ranges observed.

Resonance frequencies depend on vortex core position.

Micromagnetic simulations agree qualitatively with experiments.

Abstract

In planar structures, the vortex resonance frequency changes little as a function of an in-plane magnetic field as long as the vortex state persists. Altering the topography of the element leads to a vastly different dynamic response that arises due to the local vortex core confinement effect. In this work, we studied the magnetic excitations in non-planar ferromagnetic dots using a broadband microwave spectroscopy technique. Two distinct resonance frequency ranges were observed depending on the position of the vortex core controllable by applying a relatively small magnetic field. The micromagnetic simulations are in qualitative agreement with the. experimental results.