Study On The Influence Of High-μ Material On Magnetoelectric Effect Of Magnetostrictive/Piezoelectric Laminate Composite

Currently, the magnetoelectric(ME) composite materials have been widely used in sensors, transducers, filters, oscillators, phase shifter, memory and so on. Against sensor and transducer characteristics, it's mainly to be concerned to enhance the ME response of laminated composite, improve the sensitivity of the ME voltage coefficient for the laminated composite to a DC magnetic field,and reduce the optimal bias magnetic field of laminated composite. The method is mainly to use new magnetoelectric materials and the design of new magnetoelectric structure. Magnetostrictive and piezoelectric materials can realize the magneto-mechanical and electro-mechanical conversion, respectively. The composites of magnetostrictive and piezoelectric material produce new effects such as magnetoelectric effect which is not existed in magnetostrictive or piezoelectric phase. As excitation source is the magnetic field, the magnetostrictive laminate of laminated composite realizes the magneto-mechanical conversion, it can influence the ME response of ME laminated composite by changing the properties of magnetostrictive materials. The researches show that ME of magnetoelectric laminated composite can be changed by influencing the phase of the magnetization of magnetostrictive phase. Therefore, this high permeability iron-based nanocrystalline alloy strips FeCuNbSiB be used to the magnetostrictive phase. The main work is as follows:1)Use ANSOFT engineering finite element analysis software to simulate the magnetization of FeNi, FeCuNbSiB/FeNi in the bias magnetic field. Measured the dynamic magneto-mechanical behaviors of magnetostrictive material by using Laser Dopper vibrometer. And compared the physical properties of FeNi and Terfenol-D.2)A new ME laminated composite FeCuNbSiB/FeNi/PZT, which the high permeability FeCuNbSiB and PZT respectively affixed to the constant elasticity of FeNi-based alloy surface, is developed. Because FeCuNbSiB concentrates flux into the magnetostrictive layer ends to enhance the magnetization of magnetostrictive phase.3)The influence of high-permeability FeCuNbSiB alloy on applied DC magnetic field, piezomagnetic coefficient and optimal bias magnetic field of FeNi/PZT is investigated according to the equivalent circuit method and the theory of magnetic charge. Calculated the optimal size of FeCuNbSiB for the minimum bias magnetic field . 4)For FeCuNbSiB/FeNi/PZT defects, FeCuNbSiB-FeNi-FeCuNbSiB/PZT is developed according to the device magnetization analysis with ANSOFT software. Then have a experiment and analysis.5)To verify the theoretical results, a ME response measure system is built up. The making procedure of FeCuNbSiB/FeNi/PZT sample and the cautions to the test system are introduced respectively. The experiments are processed by the active method and the ME performances are measured. Discussed the ME of FeCuNbSiB/FeNi/PZT laminated composite on applied DC magnetic field. The response-frequency strain coefficient is tested on different applied DC magnetic field. Experimental results show: For FeCuNbSiB/FeNi/PZT, the optimal bias magnetic field of the ME voltage coefficient of laminated composites is decreased form 200Oe to 55Oe, and the maximum magnetoelectric voltage coefficient is increased from 1.59V/Oe to 2.77V/Oe. For FeCuNbSiB-FeNi-FeCuNbSiB/PZT, the optimal bias magnetic field is down to 7 Oe, and the maximum magnetoelectric voltage coefficient increases to 4.74 V/Oe. The variations in ME effect of three-phase composie result from the enhancement of magnetizetion, which is generated by introducing the high permeability material phase.