The excitation and detection of propagating spin waves with lithographed nanoantennas underpin both classical magnonic circuits and emerging quantum technologies. Here, we establish a framework for all-electrical propagating spin-wave spectroscopy (AEPSWS) that links realistic electromagnetic drive fields to micromagnetic dynamics. Using finite-element (FE) simulations, we compute the full vector near-field of electrical impedance-matched, tapered coplanar and stripline antennas and import this distribution into finite-difference (FD) micromagnetic solvers. This approach captures the antenna-limited wave-vector spectrum and the component-selective driving fields (perpendicular to the static magnetisation) that simplified uniform-field models cannot. From this coupling, we derive how realistic current return paths and tapering shapes, k-weighting functions, for Damon-Eshbach surface spin waves in yttrium-iron-garnet (YIG) films are, for millimetre-scale matched CPWs and linear tapers down to nanometre-scale antennas. Validation against experimental AEPSWS on a 48nm YIG film shows quantitative agreement in dispersion ridges, group velocities, and spectral peak positions, establishing that the antenna acts as a tunable k-space filter. These results provide actionable design rules for on-chip magnonic transducers, with immediate relevance for low-power operation regimes and prospective applications in quantum magnonics.
@article{arxiv.2511.10346,
title = {k-Selective Electrical-to-Magnon Transduction with Realistic Field-distributed Nanoantennas},
author = {Andreas Höfinger and Andrey A. Voronov and David Schmoll and Sabri Koraltan and Florian Bruckner and Claas Abert and Dieter Suess and Morris Lindner and Timmy Reimann and Carsten Dubs and Andrii V. Chumak and Sebastian Knauer},
journal= {arXiv preprint arXiv:2511.10346},
year = {2025}
}