Spin-wave eigenmodes in direct-write 3D nanovolcanoes

Autor(en)

O. V. Dobrovolskiy, N. R. Vovk, A. V. Bondarenko, S. A. Bunyaev, S. Lamb-Camarena, N. Zenbaa, R. Sachser, S. Barth, K. Y. Guslienko, A. V. Chumak, M. Huth, G. N. Kakazei

Abstrakt

Extending nanostructures into the third dimension has become a major research avenue in modern magnetism, superconductivity, and spintronics, because of geometry-, curvature-, and topology-induced phenomena. Here, we introduce Co–Fe nanovolcanoes—nanodisks overlaid by nanorings—as purpose-engineered 3D architectures for nanomagnonics, fabricated by focused electron beam-induced deposition. We use both perpendicular spin-wave resonance measurements and micromagnetic simulations to demonstrate that the rings encircling the volcano craters harbor the highest-frequency eigenmodes, while the lower-frequency eigenmodes are concentrated within the volcano crater, due to the non-uniformity of the internal magnetic field. By varying the crater diameter, we demonstrate the deliberate tuning of higher-frequency eigenmodes without affecting the lowest-frequency mode. Thereby, the extension of 2D nanodisks into the third dimension allows one to engineer their lowest eigenfrequency by using 3D nanovolcanoes with 30% smaller footprints. The presented nanovolcanoes can be viewed as multi-mode microwave resonators and 3D building blocks for nanomagnonics.

Organisation(en)

Nanomagnetismus und Magnonik

Externe Organisation(en)

Universidade do Porto, Kharkiv National University, Johann Wolfgang Goethe-Universität Frankfurt am Main, University of the Basque Country, Ikerbasque Basque Foundation for Science

Journal

Applied Physics Letters

Band

118

Anzahl der Seiten

6

ISSN

0003-6951

DOI

https://doi.org/10.1063/5.0044325

Publikationsdatum

03-2021

Peer-reviewed

Ja

ÖFOS 2012

103017 Magnetismus

ASJC Scopus Sachgebiete

Physics and Astronomy (miscellaneous)

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/af862ff2-8dd5-41fe-b7ac-9af356cd6e1d