| Multiferroic materials is a material which contain two or more ferric properties, it contain ferromagnetic, ferroelastic and ferroelectric and so on. Magnetic-electric coupling effects present in multiferroic materials, so that the charge can be controlled by magnetic field and the spin can be controlled by electric field. Since it could add a degree of freedom for traditional sensors, memory and motivation devices, this property has a high potential application value for the design of multifunctional devices. At present, the commonly storage type are the ferromagnetic storage type and the ferroelectric storage type. Both write and read are achieves by magnetic for the ferromagnetic storage type. For ferromagnetic storage type, the read is fast but the write is slow. For ferromagnetic storage, both write and read achieve by electric. The write is fast but the read is slow. However, the memory devices which made by Multiferroic materials can achieve that write by electric and read by magnetic. Consequently, the process of write and read will very fast. In addition, magnetic-electric materials maybe used to magnetic resonance equipment, polymorphous memory elements and piezomagnetic sensor which controlled by electric field as well as piezoelectric sensor, magnetic imaging technology and inspection, magnetic shielding and so on which controlled by magnetic. The literatures have introduced the scientific implications of multiferroic materials, such as family of transition metal oxide, ABO3perovskite structure, strongly correlated system, charge order, orbit order, spin order, quantum control, domain engineering and multi-scale problems. The unique characteristics of dielectric, piezoelectricity and optics properties for multiferroic materials show a lot of physical connotation. Consequently, the study of multiferroic materials has a high value in theory as well as in technology and application.In this paper, Ba(Tii-xFex)O3and (Bai-xNdx)(Ti0.85Fe0.15)O3are prepared by sol-gel and solid state reaction method, respectively. These samples’phase constitution, magnetic properties and ferroelectric properties have been measured and study.For this series Ba(Ti1-xFex)O3sample, the phase structure has been studied by XRD and it has a pure phase with hexagonal perovskite structure. The results show that the samples’ until cell volume increase with the increased doping content x. An obviously magnetic hysteresis phenomenon is observed for the sample x=0.15, and it has the largest coercive force for this series Ba(Ti1-xFex)O3samples. However, a paramagnetic property has been shown in20%doped BaTiO3. For this series Ba(Ti1-xFex)O3samples, electric polarization increase with the increased Fe dose. When x=0.30, electric hysteresis loop has an obviously change, and the electric polarization is30times larger than the sample x=0.20.The XRD results of (Ba1-xNdx)(Ti0.85Fe0.15)O3show that hexagon structure and cubic structure coexist in the sample x=0.5. However, when x≥0.15, the samples have a pure cubic structure. When x=0.15the magnetic hysteresis phenomenon is the most obviously, and it has the largest coercive force for this series sample, which obviously larger than Ba(Ti0.85Fe0.15)O3. At10K, Magnetic hysteresis loop also appear for (Ba0.85Nd0.15)(Ti0.85Fe0.15)O3, and the magnetic property larger than room temperature. The M-T result of (Ba0.85Nd0.15)(Ti0.85Fe0.15)O3show that magnetization intensity sharply decrease with the increased temperature in10-25K. For (Ba1-xNdx)(Ti0.85Fe0.15)O3samples, when x=0.20, the electric hysteresis loop also has an obviously change, and coercive field is much larger than Ba(Ti0.80Fe0.20)O3sample. |
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