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Damping of Magnetization Dynamics by Phonon Pumping
Simon Streib1, Hedyeh Keshtgar2, Gerrit E W Bauer1,3
1Kavli Institute of NanoScience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, Netherlands.
Physical Review Letters
|August 8, 2018
Summary
This study explores phonon pumping from magnetic film dynamics into contacts. Interference patterns in damping reveal a novel mechanism beyond standard viscous damping, dependent on magnetic and material properties.
Area of Science:
- Condensed matter physics
- Materials science
- Magnetism
Background:
- Phonon pumping is a mechanism for generating phonons.
- Magnetic film dynamics can influence energy transfer.
- Viscous damping (Gilbert damping) is a common model for magnetic dissipation.
Purpose of the Study:
- To theoretically investigate phonon pumping driven by magnetic film dynamics.
- To understand the role of energy and angular momentum loss in this process.
- To identify conditions and parameters influencing phonon pumping.
Main Methods:
- Theoretical investigation of phonon pumping.
- Analysis of energy and angular momentum loss.
- Modeling of interference patterns in damping.
Main Results:
- Observed interference patterns in enhanced damping.
- Demonstrated dependence on resonance frequency and film thickness.
- Showed dependence on magnetization direction, geometry, and material parameters.
- Identified a damping mechanism not described by viscous damping.
Conclusions:
- Phonon pumping by magnetic film dynamics is a significant phenomenon.
- The observed interference patterns indicate a novel damping mechanism.
- This effect is tunable via magnetic, geometric, and material properties.
- Phonon pumping is observable in systems like yttrium iron garnet thin films.
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