A5005058776- Multiferroics and related materials
- Ferroelectric and Piezoelectric Materials
- Magnetic Properties and Synthesis of Ferrites
- Magnetic and transport properties of perovskites and related materials
- Characterization and Applications of Magnetic Nanoparticles
- Dielectric properties of ceramics
- Electrospun Nanofibers in Biomedical Applications
- Conducting polymers and applications
- Magneto-Optical Properties and Applications
- Iron oxide chemistry and applications
- Acoustic Wave Resonator Technologies
- Fiber-reinforced polymer composites
- Advanced Condensed Matter Physics
- Electromagnetic wave absorption materials
- Advanced Sensor and Energy Harvesting Materials
- Nanoplatforms for cancer theranostics
- Magnetic Properties and Applications
- Magnetic Field Sensors Techniques
- Geophysical and Geoelectrical Methods
- Topological Materials and Phenomena
- Electrical and Bioimpedance Tomography
- Ultrasound Imaging and Elastography
- Phase-change materials and chalcogenides
- Thermal Expansion and Ionic Conductivity
- TiO2 Photocatalysis and Solar Cells
Universidade Federal de São Carlos
2012-2024
Instituto Federal de Educação Ciência e Tecnologia do Paraná
2024
Universidade Estadual de Maringá
2024
Universidade Federal do Rio Grande do Norte
2024
The University of Texas at San Antonio
2016
This study evaluates the structural, microstructural, electric and magnetic properties of nickel ferrite samples prepared through solid state reaction. It was observed that an increase in sintering temperature produces a higher cation concentration A site when compared to B site. The assessment showed grain size leads decrease coercive fields verging on superparamagnetic values, while saturation magnetization increases up 46.5 Am².kg-1 for sintered at 1200 ºC. dc resistivity behavior...
The research for lead-free magnetoelectric (ME) multiferroic composite materials has increased considerably because they are environmentally friendly. For composites with 0-3 connectivity, synthesis phase proven challenging to obtain high values of ME coupling. This work reports the successful KNN/CFO (K
An alternative to obtain multiferroic materials is the production of composite that combine ferroelectric and magnetic materials. In particular, use magnetostrictive as ferromagnetic phase in composites very important because mechanical stress applied induces appearance magnetoelectric effect. this work, we have proposed a generalized model for magnetostriction dependence with magnetization 0-3 type Including both piezomagnetic magnetostriction, relevant improvement was reached compared...
Based on a magnetic relaxation model, an approach that includes the spin dynamics is proposed and applied to describe magnetoelectric (ME) effect frequency dependence for 0–3 type composite at low temperatures. Our results show ME coefficient, in temperatures, PMN-PT/CFO ((1−x)Pb(Mg1/3Nb2/3)−xPbTiO3/CoFe2O4) has step-like behavior hysteresis loop of 1 kHz, contrasting with frequencies (10 Hz). This assumes ferromagnetic ferroelectric phases are coupled through interactions spins phase...
Pyroelectric current and field-dependent specific heat measurements on polycrystalline samples of the quadruple perovskite (LaMn3)Mn4O12 give evidence ferroelectricity driven by canted antiferromagnetic ordering B-site Mn3+ ions at TN,B=78 K with record large remnant electric polarization up to 0.56 μC cm−2. X-ray diffraction indicate an anomalous behavior monoclinic β angle TN,B, which suggests that lies in ac-plane, where moments are collinear, symmetric exchange striction is mechanism...
In this work the effect of ferrite concentration on dielectric and magnetoelectric properties in (1-x)Pb(Mg1/3Nb2/3)0.68Ti0.32O3 +(x) CoFe2O4, 0.10 ≤ x 0.50, particulate composites sintered by conventional method was investigated. Optimized sintering conditions, which resulted samples with relatively high density resistivity values, allowed an effective poling processing. Moreover, resulting low phase interdiffusion guaranteed a good 0-3 connectivity maintenance for all compositions. Such...
Abstract KBiFe 2 O 5 (KBFO) is a perovskite‐like inorganic material that has great potential as an absorber for active layers of photovoltaic devices; however, the synthesis conditions reported until now (pressure and temperature) are inappropriate its direct deposition on usual substrates solar cells. Being able to synthesize these materials directly substrate avoids second stage this material, besides improving joining properties consequently energy conversion efficiency. To decrease...
The influence of ferromagnetic phase properties on the magnetoelectric response hot pressed particulate composites formed by 80 mol% 0.675[Pb(Mg1/3Nb2/3)O3]–0.325[PbTiO3] as piezoelectric matrix and 20 NiFe2O4, CoFe2O4 or BaFe12O19 phases was analyzed. pressing sintering method suitable for obtaining with apparent density higher than 94% electric resistivity close to 109 Ω.m, independently used. magnitude coupling seems be governed ferroelectric PMN-PT matrix, zero bias coefficient values...
In this work the angular dependence of magnetoelectric response in PMN-PT/CFO particulate composites was investigated. Magnetostrictive and measurements were performed as a function angle between electric polarization magnetic bias field for 0–3 ceramic prepared through solid state reaction hot uniaxial pressing methods. The showed strong dependence, which can be directly related to magnetostrictive piezoelectric properties composites.
In this work, the influence of ferroelectric phase on magnetoelectric response particulate composites were investigated. The constituted by PMN-PT, PZT and PBN as CoFe2O4 ferromagnetic (prepared through conventional solid state method) synthesized hot forging method in 80/20 molar ratio using 0-3 connectivity. We show that increase magnetic coercive field for composed comparison to PMN–PT is related different elastic constants matrix used. Also, ME properties has been attributed mechanically...
Ferroelectric oxides are currently being studied as absorbing materials in photovoltaic devices due to their spontaneous polarization that facilitates charge separation. KBiFe2O5 (KBFO) is a ferroelectric oxide with perovskite like structure has low band gap; however, it relatively electrical conductivity, which makes difficult transport and collect carriers. One way of overcoming deficiency would be by decreasing the dimensions active layer. Thus, this work, for first time, nanofibers KBFO...
The dependence of frequency and applied magnetic field in the magnetoelectric effect (ME) composites 0.68Pb(Mg1/3Nb2/3)-0.32PbTiO3/CoFe2O4 (PMN-PT/CFO) 0.68Pb(Mg1/3Nb2/3)-0.32PbTiO3/NiFe2O4 (PMN-PT/NFO) are investigated. results for PMN-PT/CFO composite, show a hysteretic behavior ME coefficient, at low temperatures (5 K), frequencies higher than 1000 Hz. Contrasting with these results, coefficient PMN-PT/NFO shows well-known peak-peak related magnetostriction coefficient. Based on energy...
Abstract BiFeO
Magnetomotive ultrasound (MMUS) imaging has been proposed to overcome the limitation of localize magnetic nanoparticles (MNP) within tissues. A harmonic field is commonly used; however, this approach can present drawbacks such as heating amplifier and coil, frequency-dependent tissue mechanical response, extended rise time. Therefore, study aimed develop a pulsed electronic system improve application during MMUS. The was capable providing stimulation, improving magnitude, decreasing time by...
The study of nanoparticles has generated great interest in recent years several areas research.For example, multiferroic composite materials, the combination ferroelectric materials and ferrites may lead to magnetoelectric effect.In particular, CoFe2O4 NiFe2O4 combined/fused/?? as magnetic phase is interest, these are isolating oxides with high transition temperatures saturation magnetization.In this work, effective anisotropy was studied a function temperature for nanocrystalline nickel...