Spin-Wave Dispersion Measurement by Variable-Gap Propagating Spin-Wave Spectroscopy

Autor(en)

Marek Vanatka, Krzysztof Szulc, Ondrej Wojewoda, Carsten Dubs, Andrii Chumak, Maciej Krawczyk, Oleksandr Dobrovolskiy, Jaroslaw W. Klos, Michal Urbanek

Abstrakt

Knowledge of the spin-wave dispersion relation is a prerequisite for the explanation of many magnonic phenomena as well as for the practical design of magnonic devices. Spin-wave dispersion measurement by established optical techniques such as Brillouin light scattering or the magneto-optical Kerr effect at ultralow temperatures is often forbiddingly complicated. By contrast, microwave spectroscopy can be used at all temperatures but it usually lacks spatial and wave-number resolution. Here we develop a variable-gap-propagating-spin-wave-spectroscopy (VGPSWS) method for the deduction of the dispersion relation of spin waves in a wide frequency and wave-number range. The method is based on the phase-resolved analysis of the spin-wave transmission between two antennas with variable spacing, in conjunction with theoretical data treatment. We validate the method for in-plane magnetized Co-Fe-B and yttrium iron garnet thin films in 𝐤⁢⊥⁢𝐁 and 𝐤∥𝐁 geometries by deducing the full set of material and spin-wave parameters, including spin-wave dispersion, hybridization of the fundamental mode with the higher-order perpendicular standing spin-wave modes, and surface spin pinning. The compatibility of microwaves with low temperatures makes this approach attractive for cryogenic magnonics at the nanoscale.

Organisation(en)

Nanomagnetismus und Magnonik

Externe Organisation(en)

Innovent e.V. Technologieentwicklung Jena, Brno University of Technology, Adam Mickiewicz University

Journal

Physical Review Applied

Band

16

Anzahl der Seiten

10

ISSN

2331-7019

DOI

https://doi.org/10.1103/PhysRevApplied.16.054033

Publikationsdatum

11-2021

Peer-reviewed

Ja

ÖFOS 2012

103015 Kondensierte Materie, 103018 Materialphysik

Schlagwörter

ASJC Scopus Sachgebiete

Allgemeine Physik und Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/762a9948-df7d-40cd-ab4e-573c96efcf94