Application Cases

Experiment Name: Correlation Experiment on Interfacial Stress Transfer and Magnetic Emission Properties of Magneto-Electric Composite Materials

Research Direction: The study focuses on the enhancement mechanism of magnetic emission properties of PZTMFC/Metglas magneto-electric composite materials modified by MoS₂. By optimizing acoustic impedance matching (with a sound transmission coefficient of 0.132 at 1 wt% MoS₂ filling), the magnetic emission intensity reaches 331 μT (1.5 times higher than the unmodified version) and a radiation intensity of 2.7 nT at a distance of 1 m. The experiment also verifies signal integrity transmission using ASK modulation and extrapolates a radiation intensity of about 40 fT at 100 m. The study reveals the quantitative correlation between the acoustic properties of the adhesive layer and magneto-electric coupling, providing a new solution for underwater and underground communication systems.

Experiment Purpose: To investigate the influence of acoustic impedance matching parameters of MoS₂-modified adhesive layers (filling amount, Young's modulus) on the stress transfer efficiency of magneto-electric composite materials, and their regulatory effects on magnetic emission intensity enhancement (increased by 1.5 times to 331 μT) and far-field radiation capability (reaching 2.7 nT at 1 m). This research aims to provide a high-performance magneto-electric emission solution for underwater and underground communication systems.

Testing Equipment: Lock-in amplifier, DC current source, Helmholtz coil, solenoid, ATA-3090 power amplifier, signal generator, signal analyzer, calibration coil, dynamic mechanical analyzer, differential scanning calorimeter, thermogravimetric analyzer, electronic universal testing machine, X-ray diffractometer, Fourier-transform infrared spectrometer, scanning electron microscope.

Experiment Process: In the magneto-electric composite system, a lock-in amplifier drives the Helmholtz coil to generate a DC bias magnetic field and the solenoid to excite an AC magnetic field, while the power amplifier regulates the resonant state of the piezoelectric fiber. The magnetic emission intensity and radiation field strength at 1 m are quantified in the MoS₂-modified adhesive layer's PZT/Metglas composite structure. An ASK modulated signal is generated by the signal generator, and the waveform fidelity is analyzed by the signal analyzer. The stress transfer efficiency is calculated based on the acoustic impedance model, and the far-field radiation intensity is extrapolated based on the magnetic dipole equation, ultimately establishing a quantitative correlation model between acoustic matching parameters and magneto-electric conversion efficiency.

Figure 1: Schematic diagram of the magneto-electric composite material modulation measurement device.

Experimental Results: Acoustic impedance matching tests confirm that when the MoS₂ filling amount is 1 wt%, the Young's modulus of the adhesive layer increases to 5.56 GPa (unmodified is only 3.2 GPa), and the sound transmission coefficient reaches 0.132 (unmodified is 0.077). The stress transfer efficiency is improved by 71%, driving the magneto-electric composite material to achieve a magnetic emission intensity of 331 μT under the optimal bias field (12 kHz resonance frequency, 1 A DC bias), which is 1.5 times higher than the unmodified sample (220 μT). The measured radiation intensity at a distance of 1 m from the emission source is 2.7 nT, and the extrapolated radiation intensity at 100 m is about 40 fT based on the magnetic dipole model. In the ASK modulation verification experiment, the waveform fidelity of the binary signal (0101 sequence) analyzed by the signal analyzer is >98%, achieving lossless transmission of digital signals. The quantitative correlation model further reveals that the acoustic impedance parameter (Z = 2.7 MRayl) has a fitting correlation coefficient of R² = 0.94 with the magnetic emission intensity, indicating that the regulatory weight of interfacial stress transfer efficiency on magneto-electric conversion is dominant (85%).

Figure 2: Under the optimal bias, the magneto-electric composite material before and after MoS₂ filling: (a) Near-field radiation characteristics (b) Magnetic field strength variation curve with measured distance

Table 3: Comparison of radiation performance of magneto-electric antennas reported in this work and previous studies

Power Amplifier Recommendation: ATA-3090C

Figure: ATA-3090C Power Amplifier Specification Parameters