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Coherent and Dissipative Coupling in a Magnetomechanical System.
P Carrara1,2, M Brioschi1,2, R Silvani3
1Dipartimento di Fisica, Università degli Studi di Milano, Via Celoria 16, 20133 Milano, Italy.
Physical Review Letters
|June 10, 2024
Summary
Researchers explored hybrid elastic and spin waves in magnetic nanostripes. They quantitatively determined the coupling between these quasiparticles, paving the way for energy-efficient magnetic signal technologies.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Hybrid elastic and spin waves offer potential for energy-efficient magnetic signal generation and detection.
- Long coherence times are desirable for advanced magnetic technologies.
Purpose of the Study:
- To investigate the combined elastic and magnetic dynamics in a one-dimensional magnetomechanical crystal.
- To quantitatively determine the coupling mechanisms between phononic and magnonic modes.
Main Methods:
- Impulsive excitation of phononic and magnonic modes using an ultrafast optical trigger.
- Monitoring mode decay via time-resolved magneto-optical Kerr effect.
- Complementary measurements using Brillouin light scattering and micromagnetic simulations.
Main Results:
- Demonstrated the simultaneous excitation and decay of elastic (phononic) and magnetic (magnonic) waves.
- Quantitatively characterized the strength and degree of mixing between coherent and dissipative coupling.
- Established a unified understanding of the coupled dynamics in the magnetomechanical crystal.
Conclusions:
- The study provides a quantitative framework for understanding hybrid wave dynamics in magnetomechanical systems.
- Findings are crucial for designing future energy-efficient spintronic and magnonic devices.
- The developed methods enable precise control and manipulation of coupled quasiparticles.
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