Modeling the Magnetoelectric Composites in a Wide Frequency Range

Area of Science:

• Materials Science and Engineering
• Condensed Matter Physics
• Electromagnetism

Background:

• The magnetoelectric (ME) effect, crucial for multiferroic materials, enables control of magnetic properties with electric fields and vice versa.
• Understanding the ME effect in composite materials is vital for developing advanced sensors, actuators, and memory devices.
• Existing theories often focus on quasi-static conditions, leaving high-frequency and resonant behaviors less explored.

Purpose of the Study:

• To present a comprehensive general theory for the magnetoelectric (ME) effect in composite materials.
• To investigate the ME effect in both low- and high-frequency regimes, with a specific focus on electromechanical resonance.
• To provide analytical expressions for ME voltage coefficients and compare them with experimental findings.

Main Methods:

• Development of a general theoretical framework for the ME effect in composite structures.
• Detailed analysis of electromechanical resonance modes (longitudinal, bending, shear, torsional).
• Analytical calculations for ME voltage coefficients in layered composites (e.g., GaAs/Metglas, LiNbO3/Metglas).
• Investigation of the microwave ME effect using ferromagnetic materials and various piezoelectrics.
• Application of finite element modeling (FEM) for simulation and comparison with analytical methods.

Main Results:

• The theory accurately predicts ME voltage coefficients for symmetric and asymmetric layered structures.
• Experimental results for GaAs/Metglas and LiNbO3/Metglas composites show good agreement with theoretical predictions.
• The microwave ME effect, observed as a ferromagnetic resonance (FMR) line shift under an electric field, is analyzed for various material combinations.
• Finite element modeling provides a complementary approach to analytical calculations, validating the proposed methods.

Conclusions:

• The presented general theory provides a robust framework for understanding the ME effect in composites across a wide frequency range.
• The study highlights the importance of electromechanical resonance in enhancing ME coupling.
• The findings are applicable to the design and optimization of advanced magnetoelectric devices operating at various frequencies, including microwave regimes.