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Steerable current-driven emission of spin waves in magnetic vortex pairs
Sabri Koraltan1,2,3, Katrin Schultheiss4, Florian Bruckner1
1Faculty of Physics, University of Vienna, Kolingasse 14-16, A-1090 Vienna, Austria.
Science Advances
|September 25, 2024
Summary
Researchers achieved efficient spin wave generation in magnetic vortices using current-driven Oersted fields. This method offers superior excitation efficiency and tunable magnon propagation for advanced magnonic devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Efficient spin wave excitation is crucial for developing functional magnonic devices.
- Existing methods often lack the necessary efficiency or tunability.
Purpose of the Study:
- To demonstrate a novel method for current-driven spin wave generation in antiferromagnetically coupled magnetic vortices.
- To investigate the excitation mechanism and explore tunability of magnon propagation.
Main Methods:
- Utilized time-resolved x-ray microscopy for direct imaging of spin wave emission.
- Employed micromagnetic simulations to identify the excitation source.
- Investigated magnetostrictive materials to study magnon steering.
Main Results:
- Successfully demonstrated current-driven spin wave generation in magnetic vortices.
- Identified Oersted fields, not spin-transfer torques, as the primary excitation mechanism.
- Achieved significantly higher spin-wave excitation efficiency compared to stripline antennas.
- Showcased tunable magnon propagation direction by controlling excitation amplitude in magnetostrictive materials.
Conclusions:
- The demonstrated method provides an efficient and tunable approach for spin wave excitation.
- This work represents a significant advancement in the design and realization of magnonic devices.
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