Detection of domain wall eigenfrequency in infinity-shaped magnetic nanostructures

TL;DR

This study experimentally investigates the eigenfrequencies of domain walls in infinity-shaped magnetic nanostructures using resonance and pulse techniques, revealing multiple eigenmodes and coexistence of spin wave excitations.

Contribution

It introduces experimental methods to measure domain wall eigenfrequencies and uncovers multiple eigenmodes and spin wave coexistence in magnetic nanostructures.

Findings

Multiple eigenmodes observed at large excitation amplitudes

Frequency of damped gyration matches frequency domain measurements

Coexistence of spin wave excitations with domain wall dynamics

Abstract

The dynamics of a magnetic infinity-shaped nanostructure has been experimentally studied by two different techniques such as the sinusoidal resonance excitation and the damped short pulse excitation to measure the eigenfrequency of domain walls. Direct observation of the magnetic domain wall nucleation has been measured in the frequency domain. Electrical measurements of the domain wall dynamics in the frequency domain reveal the existence of multi-eigenmodes for large excitation amplitudes. The time-resolved measurements show that the frequency of the damped gyration is similar to that of the frequency domain and coexistence of spin wave excitations.