Abstract
New composite materials consisting of polymer matrix with PZT and NdFeB microparticles were prepared and investigated in the work. It was found that magnetic properties such as saturation magnetization, coercivity, permeability, depend on mass concentration of the ferromagnetic particles in the samples. Also it was found that all samples had electrical polarization in DC external electric field. The electric properties such as coercivity, remanent polarization, the maximum polarization value, had changes in the external constant magnetic field 1.1 kOe. These changes depended on both concentrations of ferromagnetic and ferroelectric particles. This type of magnetoelectric transformation allows us to classify new materials as multiferroic materials. These new composite materials can easily be prepared of any shape, the final materials are flexible and resistant to external chemical influences. The area of application of new multiferroic materials varies from sensors to autonomous energy sources.
Highlights
Smart materials are materials which convert one form of energy to another [1]
The internal stresses arise in the elastic matrix and these stresses can result in rotation or displacement of ferroelectric particles or prevent it what results in the changes of electric properties
The magnetic relaxation properties were measured in two modes: first mode was in the constant magnetic field 500 Oe, second mode was after switching magnetic field off
Summary
Smart materials are materials which convert one form of energy to another [1]. Usual ferromagnetic or ferroelectric materials are smart. Magnetostrictive effect which is observed in ferromagnetic materials is the example of changes of shape and sizes in the external magnetic field. Multiferroic materials are smart structures due to combination of magnetostriction and piezoelectric properties in one material [4,5]. Magnetorheological materials such as fluids, foams, elastomers are smart structures. New type of composite multifunctional material with both ferromagnetic, ferroelectric and ferroelastic properties was prepared. In this work we investigated the influence of external magnetic field on the electric properties of new three-component composite material. We investigated the effect of ferroelectric particles on the magnetic properties of the samples. The opposite effect can be observed: the displacement of ferroelectric particles leads to changes in magnetic properties [9]
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