Steerable current-driven emission of spin waves in magnetic vortex pairs

Author(s)

Sabri Koraltan, Katrin Schultheiss, Florian Bruckner, Markus Weigand, Claas Abert, Dieter Suess, Sebastian Wintz

Abstract

The efficient excitation of spin waves is a key challenge in the realization of magnonic devices. We demonstrate current-driven generation of spin waves in antiferromagnetically coupled magnetic vortices. We use time-resolved x-ray microscopy to directly image the emission of spin waves upon the application of alternating currents flowing directly through the magnetic stack. Micromagnetic simulations allow us to identify the current-driven Oersted field as the main origin of excitation, in contrast to spin-transfer torques. In our case, these internal Oersted fields have an orders of magnitude higher spin-wave excitation efficiency than commonly used stripline antennas. For magnetostrictive materials, we furthermore demonstrate that the direction of magnon propagation can be steered by increasing the excitation amplitude, which modifies the underlying magnetization profile through an additional anisotropy. The demonstrated methods allow for the efficient and tunable excitation of spin waves, marking a substantial advance concerning the design of magnonic devices.

Organisation(s)

Research Platform MMM Mathematics-Magnetism-Materials, Computational and Soft Matter Physics, Physics of Functional Materials

External organisation(s)

Helmholtz-Zentrum Dresden-Rossendorf, Helmholtz-Zentrum Berlin für Materialien und Energie, Max Planck Institute for Intelligent Systems

Journal

Science Advances

Volume

10

No. of pages

11

ISSN

2375-2548

DOI

https://doi.org/10.1126/sciadv.ado8635

Publication date

09-2024

Peer reviewed

Yes

Austrian Fields of Science 2012

103017 Magnetism

ASJC Scopus subject areas

General

Portal url

https://ucrisportal.univie.ac.at/en/publications/steerable-currentdriven-emission-of-spin-waves-in-magnetic-vortex-pairs(59594b98-3883-4380-8741-4a4c68ee00c3).html