Spin waves modes in magnetic waveguides with width down to 320 nm have been studied by electrical propagating spin-wave spectroscopy and micromagnetic simulations for both longitudinal and transverse magnetic bias fields. For longitudinal bias fields, a 1.3 GHz wide spin-wave band was observed in agreement with analytical dispersion relations for uniform magnetization. However, transverse bias field led to several distinct bands, corresponding to different quantized width modes, with both negative and positive slopes. Micromagnetic simulations showed that, in this geometry, the magnetization was nonuniform and tilted due to the strong shape anisotropy of the waveguides. Simulations of the quantized spin-wave modes in such nonuniformly magnetized waveguides resulted in spin wave dispersion relations in good agreement with the experiments.
@article{arxiv.2101.11983,
title = {Electrical spin-wave spectroscopy in nanoscale waveguides with nonuniform magnetization},
author = {Giacomo Talmelli and Daniele Narducci and Frederic Vanderveken and Marc Heyns and Fernanda Irrera and Inge Asselberghs and Iuliana P. Radu and Christoph Adelmann and Florin Ciubotaru},
journal= {arXiv preprint arXiv:2101.11983},
year = {2021}
}
Comments
11 pages, 5 figures. This work has received funding from the European Union's Horizon 2020 research and innovation program under grant agreement No 801055 "Spin Wave Computing for Ultimately-Scaled Hybrid Low-Power Electronics" - CHIRON