This section collects all the official material created during the TransFerrr project as well as the publications that disseminate the results achieved by the project. If you are interested in communicating about TransFerr project get in contact with our dissemination manager Katarzyna Lenczewska (k.lenczewska@intibs.pl).
Intrinsic structural instabilities of domain walls driven by gradient coupling: Meandering antiferrodistortive-ferroelectric domain walls in BiFeO3 – Article 15
Abstract: Using the Landau-Ginzburg-Devonshire approach, we predict the intrinsic instability of the ferroelectric-ferroelastic domain walls in the multiferroic BiFeO3 emerging from the interplay between the gradient terms of the antiferrodistortive and ferroelectric order parameters at the walls. These instabilities are the interface analog of the structural instabilities in the vicinity of phase [...]
Optical, Dielectric and Magnetic Properties of La1−xNdxFeO3 Powders and Ceramics – Article 14
Abstract: Nanocrystalline La1−xNdxFeO3 powders with different concentrations of Nd3+ have been synthesized using a modified Pechini method. Their structures were studied by X-ray powder diffraction (XRD). Furthermore, La1−xNdxFeO3 nanoceramics were prepared using a high pressure sintering technique. The luminescence spectra of the powders were investigated as a function of concentration of active dopant [...]
Integer quantum Hall effect in graphene channel with p-n junction at domain wall in a strained ferroelectric film – Article 13
Abstract: We revealed that 180° domain walls in a strained ferroelectric film can induce p-n junctions in a graphene channel and lead to the nontrivial temperature and gate voltage dependences of the perpendicular modes of the integer quantum Hall effect (IQHE). In particular, the number of perpendicular modes v⊥, corresponding to the [...]
Anomalies of phase diagrams and physical properties of antiferrodistortive perovskite oxides – Article 12
Abstract: The influence of rotomagnetic (RM), rotoelectric (RE) and magnetoelectric (ME) coupling on phase diagram and properties of antiferrodistortive (AFD) perovskite oxides was reviewed. The main examples we consider in the review are typical AFD perovskites, such as incipient ferroelectrics EuTiO3, SrTiO3, EuxSr1-xTiO3, multiferroic BiFeO3 and Bi1-xRxFeO3 (x = La, Nd). The strong [...]
Analytical description of domain morphology and phase diagrams of ferroelectric nanoparticles – Article 11
Abstract: Analytical description of domain structure morphology and phase diagrams of ferroelectric nanoparticles is developed in the framework of Landau-Ginzburg-Devonshire approach. To model realistic conditions of incomplete screening of spontaneous polarization at the particle surface, it was considered covered by an ultra-thin layer of screening charge with effective screening length. The [...]
Temperature behavior of graphene conductance induced by piezoelectric effect in a ferroelectric substrate – Article 10
Abstract: Graphene on a ferroelectric can be a promising candidate to create advanced field effect transistors, modulators and electrical transducers. Recently we have shown that alternating “up” and “down” piezoelectric displacement of the ferroelectric domain surfaces can lead to the increase of graphene channel conductance at room temperature because of [...]
Synthesis of BiFeO3-Powders by Sol-Gel Process – Article 9
Abstract: The present work aims to design and study novel functional materials with multiferroic properties required in electric applications, such as magnetic and magnetoresistive sensors, actuators, microwave electronic devices, phase shifters, mechanical actuators etc. Complex oxides BiFeO3 for analysis of its magnetic properties were synthesized by sol-gel method as powders. The [...]
Structure and piezoelectric properties of Sm-doped BiFeO3 ceramics near the morphotropic phase boundary – Article 8
Abstract: The evolution of crystal structure and piezoelectric properties of the Bi1-xSmxFeO3 ceramics with compositions corresponding to the phase boundary region between the polar rhombohedral and anti-polar orthorhombic phases have been studied. The materials have been investigated using X-ray diffraction, transmission electron microscopy and piezoresponse force microscopy techniques. The diffraction measurements [...]
Fixed Volume Effect on Polar Properties and Phase Diagrams of Ferroelectric Semi-ellipsoidal Nanoparticles – Article 7
Abstract: For advanced applications in modern industry, it is very important to reduce the volume of ferroelectric nanoparticles without serious deterioration of their polar properties. In many practically important cases, the fixed volume (rather than the fixed size) corresponds to realistic technological conditions of nanoparticles fabrication. The letter is focused [...]
Rotomagnetic coupling in fine-grained multiferroic BiFeO3: Theory and experiment – Article 6
Abstract: Using Landau-Ginzburg-Devonshire (LGD) theory for BiFeO3 dense fine-grained ceramics with quasispherical grains and nanosized intergrain spaces enriched by elastic defects, we calculated a surprisingly strong size-induced increase in the antiferromagnetic transition temperature caused by the joint action of rotomagnetic and magnetostrictive coupling. Notably, all parameters included in the LGD functional [...]
Nontrivial temperature behavior of the carrier concentration in graphene on ferroelectric substrate with domain walls – Article 5
Abstract: This work explores a nontrivial temperature behavior of the carriers concentration, which governs the conductance of the graphene channel on ferroelectric substrate with domain walls that is a basic element for field effect transistors of new generation. We revealed the transition from a single to double antiferroelectric-like hysteresis loop [...]
Polar-antipolar transition and weak ferromagnetism in Mn-doped Bi0.86La0.14FeO3 – Article 4
Abstract: Having been considered as a prime example of a room-temperature magnetoelectric multiferroic, BiFeO3 continues to attract much interest. Since functional properties of this material can be effectively influenced by chemical, electrical, magnetic, mechanical and thermal stimuli, it can serve as a model for the investigation of cross-coupling phenomena in solids. [...]
Local electromechanical characterization of Pr doped BiFeO3 ceramics – Article 3
Abstract: Local electromechanical (EM) measurements were performed in Pr doped BiFeO3(BPFO) ceramics via piezoresponse force microscopy (PFM). The results revealed that local EM response was different from the macroscopic one due to the large contribution of the leakage current. The locally measured response was used to evaluate effective piezoelectric coefficient [...]
Magnetic and dipole moments in indium doped barium hexaferrites – Article 2
Abstract: Crystal and magnetic structure of the doped BaFe12−xInxO19 samples were refined by the results of investigations using high resolution neutron powder diffraction and vibration sample magnetometry at different temperatures. The refinements were realized in frame of two space groups. The P63/mmc (No 194) centrosymmetric nonpolar and P63mc (No 186) noncentrosymmetric [...]
Flexoelectricity induced spatially modulated phases in ferroics and liquid crystals – Article 1
Abstract: In the review we briefly analyze the state-of-art in the theory of flexoelectric phenomena and analyze how significantly the flexoelectric coupling can change the polar order parameter distribution in different ferroics and liquid crystals. The special attention in paid to the appearance of the spatially modulated phases induced by the [...]
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