In this manuscript, we prepared NiFe 2O 4/Pb(Zr 0.53Ti 0.47)O 3 (NFO/PZT) and Ni 0.4Zn 0.6Fe 2O 4/Pb(Zr 0.53Ti 0.47)O 3 (NZFO/PZT) composite toroids to evaluate the characteristics of both capacitance and inductance, which can avoid the magnetic leakage in comparison with the stripe samples for its closed magnetic circuit. Moreover, the nickel ferrite is easily prepared at relatively low temperature and its properties can be adjusted by zinc substitute. Nickel ferrite with a spinel structure was chosen for its large resistivity, low anisotropy and high initial permeability, which are very important for the MD and EIMP effects. Unfortunately, there is less research about the EIMP effect.Īmong the ferroelectric materials, perovskite Pb(Zr 0.53Ti 0.47)O 3(PZT) enjoys excellent piezoelectric and dielectric properties and has been widely used as the ferroelectric constituent in MD composites. In addition, the EIMP effect at room temperature has significant potential in promoting device for its magnetic permeability controlled by electric field. Then, the MD effect in composite can be achieved through the strain transmission between the magnetic and ferroelectric phases,. Therefore, the magnetic and ferroelectric components in the MD composites are commonly selected as high magnetostrictive material and high dielectric constant materials, respectively.
The MD effect depends upon the microstructure of composite, permittivity of ferroelectric phase and magnetostriction of magnetic phase. After decades of efforts, lots of MD composites have been developed, like Pb(Zr,Ti)O 3/ferrite, ,, ,, BCT-BZT/ferrite, , PMN-PT/ferrite, , BaTiO 3/ferrite, ,, ,, ,, ,, , BaTiO 3/Sr 2CoMoO 6, BiFeO 3/LaAlO 3, BiFeO 3/BiYO 3, Ba 0.5Sr 0.5Nb 2O 6/CoCr 0.4Fe 1.6O 4 and K 0.5Na 0.5NbO 3/ferrite etc. On the other hand, the multiferroic composites show a perspective application in devices since there is no special requirement for the ferroelectric and piezoelectric properties. For example, the obvious MD in perovskite TbMnO 3 with cycloidal spin orders can be observed until a high magnetic field of 6 T and low temperature of 25 K. They are difficult to achieve a practical MD value at room temperature. The single phase materials are limited by their special magnetic structure, crystal structure and Curie temperature. Multiferroic magnetoelectric (ME) materials consist of single phase and composite materials. Therefore, multiferroic materials enjoy rich physical contents to research and potential applications in the integration because they possess magnetic and dielectric behaviors simultaneously, and both which can be adjusted by the outfield excitation. Reversely, electric-field-induced magnetic permeability (EIMP) effect is another interaction between the ferromagnetic and ferroelectric sequence in multiferroic materials. It is important to understand the coupling between ferroelectric and ferromagnetic phases and design new generation of magnetic-dielectric medium devices applied in integrated circuit. The magnetodielectric (MD) effect is defined as the dielectric property controlled by magnetic field.
0 kommentar(er)
