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High-frequency magnetoacoustic resonance through strain-spin coupling in perpendicular magnetic multilayers
De-Lin Zhang1, Jie Zhu2, Tao Qu3
1Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN 55455, USA.
Science Advances
|September 19, 2020
Summary
Researchers observed strain-spin coupling in magnetic materials, achieving extremely high frequency (EHF) magnetoacoustic resonance at 60 GHz. This finding offers new ways to control EHF excitations for device applications.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Technologically important perpendicular magnetic materials are crucial for device applications.
- Experimentally demonstrating extremely high resonant frequencies (EHF) assisted by strain-spin coupling is a key goal.
Purpose of the Study:
- To directly observe and characterize the coupling of magnons and phonons in magnetic multilayers.
- To investigate the strain-spin coupling mechanism leading to magnetoacoustic resonance.
- To develop a theoretical model explaining the observed phenomena and their dependence on material properties.
Main Methods:
- Femtosecond laser excitation to probe material dynamics.
- Time and frequency domain analysis of magnon-phonon coupling.
- Development and application of a theoretical model for strain-spin interaction.
Main Results:
- Direct observation of magnon-phonon coupling in perpendicular magnetic [Co/Pd] multilayers.
- Achieved magnetoacoustic resonance in the extremely high frequency (EHF) band (e.g., 60 GHz).
- A theoretical model was proposed and validated, explaining resonance amplitude and composition, and its dependence on magnetostriction.
Conclusions:
- Strain-spin coupling can drive magnetoacoustic resonance at EHF in magnetic multilayers.
- The developed theoretical model accurately describes the observed phenomena.
- This work provides a pathway for manipulating EHF and coupled magnon-phonon excitations.
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