Preparation And Magnetoelectric Properties Of Piezoelectric/Piezomagnetic Laminated Composites

Magnetoelectric(ME) laminated composites, particularly cylindrical ME laminated composites, show strong ME coupling at room temperature, which have more superior ME property than single-phase and particle ME composites. To enhance the ME coupling effect and broaden the scope of application, the resonant multi-frequency and zero-biased ME effect were considered. The cylindrical ME laminated composites, in which the radio of the height and the diameter is sufficiently near to 1, have been prepared by electroless deposition. The vibration mode and the effect of size on ME performance of the cylindrical composites were investigated. Furthermore, the plate ME laminated composites with symmetry and asymmetry magnetostrictive composites were also prepared and the graded magnetization dependence of ME effect were investigated.The result shows that the ME effect of Ni/ Pb(Zr,Ti)O3/Ni cylindrical laminated composites strongly depends on the size and three remarkable resonance peaks have been observed in the 1~160 k Hz range, which are corresponding to the axial and radial vibration modes and their coupling. Furthermore, the ME effect at individual resonant frequencies can be weakened or enhanced due to the coupling of the two vibration modes. Meanwhile, compared with the homogeneous ME composites, the ME performances of Fe Co/Ni/Pb(Zr,Ti)O3, Ni/Fe Co/Pb(Zr,Ti)O3, and Fe Ni/Fe Co/Pb(Zr,Ti)O3 asymmetry and corresponding symmetry ME laminated composites show a strong zero-biased ME response at low frequency and the ME voltage coefficient of the magnetically graded samples at the optimal bias magnetic field is larger than that of the homogenous ones. These can be attributed to an internal magnetic field induced by graded magnetization. The magnetostrictive materials and their grading sequence also play important roles in the zero-biased ME coupling at low frequency. The ME voltage coefficient of Fe Co/Ni/Pb(Zr,Ti)O3/Ni/Fe Co symmetry composite is largest among them at 1 k Hz. However, the ME voltage coefficients at individual resonant frequency have been weakened in graded ME composites.