A Low Frequency Mechanical Transmitter Based on Magnetoelectric Heterostructures Operated at Their Resonance...

Area of Science:

• Materials Science
• Electromagnetics
• Physics

Background:

• Magneto-elasto-electric (ME) coupling heterostructures combine piezoelectric and magnetostrictive materials.
• These materials offer potential for developing new electromagnetic emitter technologies.

Purpose of the Study:

• To develop a portable very low frequency (VLF) transmitter technology using ME coupling heterostructures.
• To investigate the electromagnetic field generation and transmission capabilities of a hybrid piezoelectric-magnetostrictive transformer.

Main Methods:

• Driving a piezoelectric layer with AC electric voltage at its electromechanical resonance (EMR) frequency.
• Utilizing the EMR to excite magnetostrictive layers, inducing magnetization changes.
• Analyzing the generated oscillating magnetic fields and corresponding electric fields using Maxwell's equations.

Main Results:

• The ME transmitter prototype demonstrated transmission capabilities, emitting a magnetic dipole-like near field.
• The developed prototype achieved 10⁴ times higher efficiency compared to a small-circular loop antenna of the same area.
• The hybrid transformer successfully transmitted modulated signals via oscillating magnetic fields.

Conclusions:

• ME coupling heterostructures are effective materials for developing novel electromagnetic emitters.
• The developed VLF transmitter technology shows superior efficiency compared to traditional small antennas.
• This technology holds promise for portable VLF transmission applications.