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Shear horizontal waves in a multiferroic composite semiconductor structure.
Lei Yang1, Enrico Zappino2, Erasmo Carrera2
1Smart Materials and Advanced Structures Laboratory, School of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, China; School of Intelligent Manufacturing, Taizhou University, Taizhou 318000, China; Mul2 Group, Department of Mechanical and Aerospace Engineering, Politecnico di Torino, Turin 10129, Italy.
Ultrasonics
|March 9, 2024
Summary
This study investigates shear horizontal (SH) wave propagation in multiferroic composite semiconductors. Results show electron concentration significantly impacts wave characteristics and fields, aiding in designing novel devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Acoustics
Background:
- Piezoelectric semiconductors (PSs) exhibit simultaneous piezoelectric and semiconducting properties.
- Adding piezomagnetic (PM) materials to PSs creates multiferroic composites with magneto-electro-semiconductive (MES) coupling.
- Understanding wave propagation in these complex structures is crucial for device applications.
Purpose of the Study:
- To analytically investigate shear horizontal (SH) wave propagation characteristics in a multiferroic composite semiconductor structure.
- To explore the influence of various parameters on wave velocity and attenuation.
- To analyze the distribution of electromechanical fields within the composite layers.
Main Methods:
- Derivation of dispersion equations using three-dimensional macroscopic theory for PS and PM materials.
- Analytical investigation of wave propagation in a composite structure with a n-type PS thin plate bonded to a PM substrate.
- Numerical analysis of phase velocity and attenuation, considering carrier density, cover thickness, and material properties.
Main Results:
- Initial electron concentration (n0) significantly affects displacement, stress, electric potential, and polarization, but not magnetic potential or flux density.
- Piezoelectric constant (e15) and piezomagnetic constant (f15) exhibit distinct influences on SH wave propagation and magnetic potential distribution.
- The study systematically analyzes the impact of material properties and structural parameters on wave behavior.
Conclusions:
- The findings provide a theoretical basis for understanding SH wave propagation in PS-PM multiferroic composites.
- The results offer valuable insights for the design and optimization of surface acoustic wave (SAW) devices utilizing these materials.
- This research contributes to the development of advanced functional materials with coupled physical properties.
Keywords:
Electromechanical fieldMulti-field couplingMultiferroic composite piezoelectric semiconductorPropagation characteristicsSH waveMore Related Videos
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