| Multiferroic materials have prospective applications in the development of multifunctionalized and miniaturized electronic devices due to their inherent properties such as ferroelectric,ferroelectric and ferromagnetic performances.As a typical multiferroic material,the magnetoelectric material has shown great potential in the fields of tunable electronic functional devices,magnetic sensors,and biomedicine.In this work,the magnetoelectric effect of the layered magnetoelectric heterostructures in electronic devices has been studied from two aspects,i.e.,the magnetoelectric voltage tunable inductor(ME-VTI)based on the converse magnetoelectric effect and the ultra-low frequency magnetic field sensor based on the direct magnetoelectric effect.For electric magnetic sensors,the former uses an external electric field to control the magnetic properties,the latter uses an external magnetic field to control the dielectric properties,and both of them use the strain field as the interactional medium.By combining material preparations,theoretical simulations,and experimental measurements,we have designed and optimized ME-VTI and magnetoelectric ultra-low frequency magnetic field sensors,in order to promote the development of high performance and miniaturized electronic devices.For the study of ME-VTI,we first established a theoretical model of ME-VTI,and prepared three L-T mode magnetoelectric heterostructures as inductor cores,namely,the PZT ceramic/Metglas,the PMN-PT single crystal/Metglas and PZT ceramic/Ni Zn ferrite,respectively.The inductance and the quality factor are tested by sweeping the frequency.Comparing the PMN-PT single crystal/Metglas inductors to PZT ceramic/Metglas inductors,due to the higher field-induced electrostrain of PMN-PT single crystal,the inductance tunability of the PMN-PT single crystal/Metglas inductor is 680% at 1 k Hz,which is 2.4 times of that PZT ceramic/Metglas.And the quality factor reaches 15.6,which is 2.8 times of that of PZT ceramic/Metglas.On the other hand,compared to PZT ceramic/Metglas-based inductors,PZT ceramic/Ni Zn ferrite-based inductors have lower high-frequency eddy current losses due to Ni Zn ferrite,and the former has good high-frequency stability.The inductance of PZT ceramic/Ni Zn ferrite-based inductors is almost unchanged from 1 k Hz to 1MHz.And the quality factor of the PZT ceramic/Ni Zn reaches 30,which is 5 times of that the PZT ceramic/Metglas.Therefore,by optimizing the materials,ME-VTI has advantages of low power consumption,small size,large tunability,etc.,and has important application potential in electronics and other fields.For the study of the ultra-low frequency magnetic sensor,we used L-T mode piezoelectric fiber composited in the MFC/multilayer Metglas magnetoelectric heterostructures as the sensitive component.The ultra-low frequency magnetic sensor with cantilever structure has been designed and fabricated.The theoretical model of the resonance state has been proposed.The resonance state was adjusted by changing the mechanical conditions,and the experiments were carried out at 30 Hz,40 Hz and 50 Hz resonance state tests,the experimental results are consistent with the theoretical and simulation.Finally,the 30 Hz sensitivity test of the resonance state of the sensitive element was carried out.When the signal processing circuit was not included,the detection limit is 10 n T.And if the signal processing circuit was included,the detection limit can be 30 n T.Due to the small size,high sensitivity and large response at lowfrequency of the magnetic sensor,it could be widely used in high-frequency attenuation environments and served for high-power sensor networks,which is expected to open up a new path in the field of long-wave communications. |
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