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).
Probing Temperature-Induced Phase Transitions at Individual Ferroelectric Domain Walls – Article 55
Abstract: Ferroelectric domain walls have emerged as one of the most fascinating objects in condensed matter physics due to the broad variability of functional behaviors they exhibit. However, the vast majority of domain walls studies have been focused on bias-induced dynamics and transport behaviors. Here, the scanning probe microscopy approach [...]
Hypothesis Learning in Automated Experiment: Application to Combinatorial Materials Libraries – Atricle 54
Abstract: Machine learning is rapidly becoming an integral part of experimental physical discovery via automated and high-throughput synthesis, and active experiments in scattering and electron/probe microscopy. This, in turn, necessitates the development of active learning methods capable of exploring relevant parameter spaces with the smallest number of steps. Here, an [...]
Highly enhanced ferroelectricity in HfO2-based ferroelectric thin film by light ion bombardment – Article 53
Abstract: Continuous advancement in nonvolatile and morphotropic beyond-Moore electronic devices requires integration of ferroelectric and semiconductor materials. The emergence of hafnium oxide (HfO2)–based ferroelectrics that are compatible with atomic-layer deposition has opened interesting and promising avenues of research. However, the origins of ferroelectricity and pathways to controlling it in HfO2 are [...]
Crystal Structure and Concentration-Driven Phase Transitions in Lu(1−x)ScxFeO3 (0 ≤ x ≤ 1) Prepared by the Sol–Gel Method – Article 52
Abstract: The structural state and crystal structure of Lu(1−x)ScxFeO3 (0 ≤ x ≤ 1) compounds prepared by a chemical route based on a modified sol–gel method were investigated using X-ray diffraction, Raman spectroscopy, as well as scanning electron microscopy. It was observed that chemical doping with Sc ions led to a structural phase [...]
Pressure induced phase transitions in Sm-doped BiFeO3 in the morphotropic phase boundary – Article 51
Abstract: Sm-doped BiFeO3 compacted powders with composition across the morphotropic phase boundary region were prepared by sol-gel method. Crystal structure, morphology and magnetic state of the compounds were analyzed as a function of dopant concentration, temperature and external pressure using synchrotron and laboratory X-ray diffraction, electron microscopy, Raman and Mössbauer spectroscopy. Application of external pressure shifts [...]
Raman investigation of multiferroic BiFeO3 and Bi1-xSmxFeO3 materials synthesized by the sol-gel method – Article 50
Abstract: The current work presents the investigation results of multiferroic materials (BiFeO3 and Bi1-xSmxFeO3) with perovskite structure, which possesses two types of orderings: ferromagnetic and ferroelectric. Also, the obtained samples were investigated by Raman spectroscopy to provide detailed information about chemical structure, phase purity and polymorphism, crystallinity and molecular interactions. [...]
Magnetic properties of BiFeO3 – BaTiO3 ceramics in the morphotropic phase boundary: A role of crystal structure and structural parameters – Article 49
Abstract: A correlation between the crystal structure and magnetic properties of system (1-x)BiFeO3 – (x)BaTiO3 with compounds across the morphotropic phase boundary was studied using X-ray and neutron diffraction, magnetometry, and Mössbauer spectroscopy measurements. Increase in the dopants content leads to the structural transition from the rhombohedral phase to the cubic phase [...]
A combined theoretical and experimental study of the phase coexistence and morphotropic boundaries in ferroelectric-antiferroelectric-antiferrodistortive multiferroics – Article 48
Abstract: The physical nature of the ferroelectric (FE), ferrielectric (FEI) and antiferroelectric (AFE) phases, their coexistence and spatial distributions underpins the functionality of antiferrodistortive (AFD) multiferroics in the vicinity of morphotropic phase transitions. Using Landau-Ginzburg-Devonshire (LGD) phenomenology and a semi-microscopic four sublattice model (FSM), we explore the behavior of different AFE, FEI, and FE [...]
Morphotropic Phase Boundary in Sm-Substituted BiFeO3 Ceramics: Local vs Microscopic Approaches – Article 47
Abstract: Samarium substituted bismuth ferrite (BiFeO3) ceramics prepared by sol-gel synthesis method were studied using both local scale and microscopic measurement techniques in order to clarify an evolution of the crystal structure of the compounds across the morphotropic phase boundary region. X-ray diffraction analysis, transmission and scanning electron microscopies, XPS, [...]
Nanoscale Piezoelectric Properties and Phase Separation in Pure and La-Doped BiFeO3 Films Prepared by Sol–Gel Method – Article 46
Abstract: Pure BiFeO3 (BFO) and doped Bi0.9La0.1FeO3 (BLFO) thin films were prepared on Pt/TiO2/SiO2/Si substrates by a modified sol–gel technique using a separate hydrolysis procedure. The effects of final crystallization temperature and La doping on the phase structure, film morphology, and nanoscale piezoelectric properties were investigated. La doping and higher crystallization temperature [...]
Predictability as a probe of manifest and latent physics: The case of atomic scale structural, chemical, and polarization behaviors in multiferroic Sm-doped BiFeO3 – Article 45
Abstract: The predictability of a certain effect or phenomenon is often equated with the knowledge of relevant physical laws, typically understood as a functional or numerically derived relationship between the observations and known states of the system. Correspondingly, observations inconsistent with prior knowledge can be used to derive new knowledge [...]
Impact of Alkali Ions Codoping on Magnetic Properties of La0.9A0.1Mn0.9Co0.1O3 (A: Li, K, Na) Powders and Ceramics – Article 44
Abstract: The aim of the work was to check how the introduction of alkali and cobalt ions into a manganese structure can affect the structural disorder and, in consequence, lead to the changes (improvements) of magnetic properties. The high-pressure sintering technique was applied to check if the external factor can [...]
Exploring physics of ferroelectric domain walls via Bayesian analysis of atomically resolved STEM data – Article 43
Abstract: The physics of ferroelectric domain walls is explored using the Bayesian inference analysis of atomically resolved STEM data. We demonstrate that domain wall profile shapes are ultimately sensitive to the nature of the order parameter in the material, including the functional form of Ginzburg-Landau-Devonshire expansion, and numerical value of [...]
Influence of heat treatment temperature on the structure of thin sol-gel samarium-doped BiFeO3 films – Article 42
Abstract: The effect of the treatment temperature on the structural properties of sol-gel films of samarium-doped BiFeO3 was established. Optimal compositions of BiFeO3:Sm films and their heat treatment modes have been determined. The effect of samarium (Sm) doping on the crystal structure and topography of the surface of thin films [...]
Evolution of the crystal structure and magnetic properties of Sm-doped BiFeO3 ceramics across the phase boundary region – Article 41
Abstract: Samarium doped BiFeO3 compounds having nano-size crystallites were prepared by the ethylene glycol assisted sol-gel synthesis method. X-ray diffraction and SEM measurements as well as Raman spectroscopy and FTIR experiments were used to clarify an evolution of the crystal structure on microscopic and local scale levels in the compounds having [...]
Impact of Gadolinium on the Structure and Magnetic Properties of Nanocrystalline Powders of Iron Oxides Produced by the Extraction-Pyrolytic Method – Article 40
Abstract: Interest in magnetic nanoparticles is primarily due to their practical use. In this work, for the production of nanocrystalline powders of pure and gadolinium doped iron oxides, the extraction-pyrolytic method (EPM) was used. As a precursor, either iron-containing extract (iron (III) caproate in caproic acid) or its mixture with [...]
Strain engineering of ferromagnetic-graphene-ferroelectric nanostructures – Article 39
Abstract: We calculate a spin-polarized conductance in a nanostructure with a composition of a “high-temperature ferromagnetic insulator-graphene-ferroelectric film,” with special attention paid to control of the electric polarization direction and value in a multiaxial ferroelectric film by a misfit strain. We propose a phenomenological model, taking into account the shift [...]
Causal analysis of competing atomistic mechanisms in ferroelectric materials from high-resolution scanning transmission electron microscopy data – Article 38
Abstract: Machine learning has emerged as a powerful tool for the analysis of mesoscopic and atomically resolved images and spectroscopy in electron and scanning probe microscopy, with the applications ranging from feature extraction to information compression and elucidation of relevant order parameters to inversion of imaging data to reconstruct structural [...]
Melting of spatially modulated phases at domain wall/surface junctions in antiferrodistortive multiferroics – Article 37
Abstract: A physical understanding of the nature of spatially modulated phases (SMPs) in rare-earth-doped antiferrodistortive (AFD) multiferroics and how they behave close to surfaces and interfaces is lacking. Here the emergence of the antiferroelectric (AFE), ferroelectric (FE), or ferrielectric (AFE-FE) spatial modulation in the vicinity of the morphotropic phase transition [...]
Flexoinduced ferroelectricity in low-dimensional transition metal dichalcogenides – Article 36
Abstract: We developed a Landau-type theory for the description of polar phenomena in low-dimensional transition metal dichalcogenides (TMDs), specifically exploring the flexoelectric origin of the polarization induced by a spontaneous bending and by inversion symmetry breaking due to the interactions with substrate. We consider the appearance of the spontaneous out-of-plane [...]
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