Long-range spin-wave propagation in transversely magnetized nano-scaled conduits

Autor(en)

Björn Heinz, Qi Wang, Michael Schneider, Elisabeth Weiß, Akira Lentfert, Bert Lägel, Thomas Brächer, Carsten Dubs, Oleksandr V. Dobrovolskiy, Philipp Pirro, Andrii V. Chumak

Abstrakt

Magnonics attracts increasing attention in the view of low-energy computation technologies based on spin waves. Recently, spin-wave propagation in longitudinally magnetized nano-scaled spin-wave conduits was demonstrated, proving the fundamental feasibility of magnonics at the sub-100 nm scale. Transversely magnetized nano-conduits, which are of great interest in this regard as they offer a large group velocity and a potentially chirality-based protected transport of energy, have not yet been investigated due to their complex internal magnetic field distribution. Here, we present a study of propagating spin waves in a transversely magnetized nanoscopic yttrium iron garnet conduit of 50 nm width. Space and time-resolved microfocused Brillouin-light-scattering spectroscopy is employed to measure the spin-wave group velocity and decay length. A long-range spin-wave propagation is observed with a decay length of up to (8.0 ± 1.5) μm and a large spin-wave lifetime of up to (44.7 ± 9.1) ns. The results are supported with micromagnetic simulations, revealing a broad single-mode frequency range and the absence of a mode localized to the edges. Furthermore, a frequency nonreciprocity for counter-propagating spin waves is observed in the simulations and the experiment, caused by the trapezoidal cross section of the structure. The revealed long-distance spin-wave propagation on the nano-scale is particularly interesting for an application in spin-wave devices, allowing for long-distance transport of information in magnonic circuits and low-energy device architectures.

Organisation(en)

Nanomagnetismus und Magnonik

Externe Organisation(en)

Technische Universität Kaiserslautern, Innovent e.V. Technologieentwicklung Jena

Journal

Applied Physics Letters

Band

118

Anzahl der Seiten

6

ISSN

0003-6951

DOI

https://doi.org/10.1063/5.0045570

Publikationsdatum

03-2021

Peer-reviewed

Ja

ÖFOS 2012

103017 Magnetismus

Schlagwörter

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/e0a36b9d-6a14-4c8c-99f1-a66f617b67ea