Spatially Resolved Dynamics of Localized Spin-Wave Modes in Ferromagnetic Wires
J. P. Park, P. Eames, D. M. Engebretson, J. Berezovsky, P. A. Crowell
TL;DR
This paper investigates localized spin-wave modes in ferromagnetic wires using time-resolved Kerr microscopy, revealing how external magnetic fields influence edge modes and their crossover, supported by micromagnetic simulations.
Contribution
It provides the first spatially resolved observation of edge-localized spin-wave modes in ferromagnetic wires and compares experimental results with micromagnetic simulations.
Findings
Localized spin-wave modes are observed at wire edges.
Edge modes merge into a single mode at low fields.
Experimental results agree with micromagnetic simulations.
Abstract
We have observed localized spin-wave modes in individual thin-film ferromagnetic wires using time-resolved Kerr microscopy as a micron-scale spectroscopic probe. The localization is due to the partial demagnetization of a wire when an external field is applied in the plane of the film and perpendicular to the long axis of the wire. Spatially-resolved spectra demonstrate the existence of distinct modes at the edges of a rectangular wire. Spectral images clearly show the crossover of the two edge modes into a single mode in low applied fields, in agreement with the results of micromagnetic simulations.
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