Abstract
In this paper, the magnetoelectric (ME) effect is investigated in two kinds of A-line shape Terfenol-D/PZT-5A structures by changing the position of the NdFeB permanent magnet. The experimental results show that both ME composite structures had multiple resonance peaks. For the ME structure with acrylonitrile-butadiene-styrene (ABS) trestles, the resonance peak was different for different places of the NdFeB permanent magnet. Besides, the maximum of the ME coefficient was 4.142 V/A at 32.2 kHz when the NdFeB permanent magnet was on top of the Terfenol-D layer. Compared with the ME coefficient with a DC magnetic field, the ME coefficient with NdFeB magnets still maintained high values in the frequency domain of 65~87 kHz in the ME structure with mica trestles. Through Fourier transform analysis of the transient signal, it is found that the phenomenon of multiple frequencies appeared at low field frequency but not at high field frequency. Moreover, the output ME voltages under different AC magnetic fields are shown. Changing the amplitude of AC magnetic field, the magnitude of the output voltage changed, but the resonant frequency did not change. Finally, a finite element analysis was performed to evaluate the resonant frequency and the magnetic flux distribution characteristics of the ME structure. The simulation results show that the magnetic field distribution on the surface of Terfenol-D is non-uniform due to the uneven distribution of the magnetic field around NdFeB. The resonant frequencies of ME structures can be changed by changing the location of the external permanent magnet. This study may provide a useful basis for the improvement of the ME coefficient and for the optimal design of ME devices.
Highlights
Magnetoelectric (ME) effect is defined as a magnetization response to an applied electric field or an electric polarization response to an applied magnetic field [1,2,3,4]
Terfenol-D layers were separately bonded with the mica trestles, and the NdFeB permanent magnet on of Terfenol-D
OverFor kHz, there was structure with NbFeB magnet, multiple resonance peaks appeared in the frequency range 0–70 kHz
Summary
Magnetoelectric (ME) effect is defined as a magnetization response to an applied electric field or an electric polarization response to an applied magnetic field [1,2,3,4] It exists in single materials and ME composites composed with ferroelectric and ferromagnetic materials [5,6,7,8]. NdFeB magnets have the characteristics of being small in size and light-weight and having strong magnetic properties. In ME experiments with NdFeB as a magnetic material, its addition will change the composition of the entire magnetoelectric structure; it will have a great influence on the magnetic field distribution of the structure. The frequency dependences of the ME coefficient for the ME structures were studied by first changing the position of NdFeB permanent magnet.
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