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Influence of CoFeB layer thickness on elastic parameters in CoFeB/MgO heterostructures
S Shekhar1, S Mielcarek2, Y Otani3,4
1Institute of Spintronics and Quantum Information, Faculty of Physics, Adam Mickiewicz University, Uniwersytetu Poznańskiego 2, 61-614, Poznan, Poland. shashank.shekhar@amu.edu.pl.
Scientific Reports
|July 1, 2023
Summary
Surface acoustic waves (SAWs) in CoFeB/MgO heterostructures were studied to understand phonon-spin interactions. Elastic properties of magnetic layers were determined, crucial for spintronic device development.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Surface acoustic waves (phonons) show potential for spintronic devices through coupling with spin waves.
- Understanding phonon properties in magnetic heterostructures is key to exploring this coupling.
- Elastic properties of magnetic layers influence phonon behavior.
Purpose of the Study:
- Investigate the frequency-wavevector dispersion of surface acoustic waves (SAWs) in CoFeB/MgO heterostructures.
- Determine the elastic tensor parameters of individual CoFeB layers.
- Estimate effective elastic parameters for the entire heterostructure stacks.
Main Methods:
- Brillouin light spectroscopy to study thermally excited SAWs.
- Finite element method (FEM) simulations to corroborate experimental findings.
- Systematic variation of CoFeB layer thickness.
Main Results:
- Extracted elastic tensor parameters for CoFeB layers by matching simulation to experimental data.
- Estimated effective elastic parameters (tensors, Young's modulus, Poisson's ratio) for CoFeB/MgO stacks.
- Demonstrated good agreement between simulations (using individual or effective parameters) and experimental results.
Conclusions:
- Elastic properties of CoFeB layers and CoFeB/MgO heterostructures were successfully determined.
- The extracted elastic parameters are valuable for understanding phonon-quasiparticle interactions.
- This research provides foundational data for designing future spintronic devices utilizing acoustic-spin coupling.
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