A5082754328- Multiferroics and related materials
- Ferroelectric and Piezoelectric Materials
- Magnetic and transport properties of perovskites and related materials
- Dielectric properties of ceramics
- Magnetic properties of thin films
- Advanced Condensed Matter Physics
- Magnetic Properties of Alloys
- Magnetic Properties and Applications
- Advanced Memory and Neural Computing
- Graphene research and applications
- Rare-earth and actinide compounds
- Acoustic Wave Resonator Technologies
- Microwave Dielectric Ceramics Synthesis
- Perovskite Materials and Applications
- Iron-based superconductors research
- Solid-state spectroscopy and crystallography
- Magnetism in coordination complexes
- 2D Materials and Applications
- Physics of Superconductivity and Magnetism
- Superconductivity in MgB2 and Alloys
- ZnO doping and properties
- Transition Metal Oxide Nanomaterials
- Metallic Glasses and Amorphous Alloys
- Copper-based nanomaterials and applications
- Magneto-Optical Properties and Applications
Centre National de la Recherche Scientifique
2014-2025
Institut de Physique et Chimie des Matériaux de Strasbourg
2016-2025
Université de Strasbourg
2015-2025
Laboratoire de Cristallographie et Sciences des Matériaux
2006-2019
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2010
École Nationale Supérieure d'Ingénieurs de Caen
2006-2010
CEA Paris-Saclay
2010
Service de Physique de l'État Condensé
2010
Institut Rayonnement-Matière de Saclay
2010
Polish Academy of Sciences
2002-2006
We demonstrate that ethylammonium copper chloride, ${({\text{C}}_{2}{\text{H}}_{5}{\text{NH}}_{3})}_{2}{\text{CuCl}}_{4}$, a member of the hybrid perovskite family is an electrically polar and magnetic compound with dielectric anomaly around Curie point (247 K). have found large spontaneous electric polarization below this accompanied color change in sample. The system also ferroelectric, remnant $(37\text{ }\ensuremath{\mu}\text{C}/{\text{cm}}^{2})$ comparable to classical ferroelectric...
Light-matter interactions that lead to nonthermal changes in size of the sample constitute a photostrictive effect many compounds. The photostriction phenomenon was observed four main groups materials, ferroelectrics, polar, and non-polar semiconductors, as well organic-based materials are reviewed here. key mechanisms its dependence on several parameters perturbations assessed. major literature is surveyed, review ends with summary proposed technical applications.
An opto-electronic switching device made from an evaporated spin crossover thin film over a graphene sensor is presented. The electrical transduction of both temperature and light-induced reversible transitions are demonstrated.
Interface-driven effects in ferroelectric van der Waals (vdW) heterostructures provide fresh opportunities the search for alternative device architectures toward overcoming von Neumann bottleneck. However, their implementation is still its infancy, mostly by electrical control. It of utmost interest to develop strategies additional optical and multistate control quest novel neuromorphic architectures. Here, we demonstrate polarization states field effect transistors (FeFET). The FeFETs,...
Magnetic field induced ferroelectric hysteresis loop observed in Bi0.75Sr0.25FeO3−δ is of prime importance. The coexistence antiferromagnetism and weak ferromagnetism responsible for the original magnetoelastic magnetoferroelectric properties. Upon external magnetic application, existence a magnetostrictive effect supports structural transition toward homogeneous antiferromagnetic phase. polarization among highest reported BiFeO3 based systems either thin film or bulk form (Pr=96μC∕cm2 at...
In electrically polar solids optomechanical effects result from the combination of two main processes, electric field-induced strain and photon-induced voltages. Whereas former depends on electrostrictive ability sample to convert energy into mechanical energy, latter is caused by capacity photons with appropriate generate charges and, therefore, can depend wavelength.We report here deformation BiFeO3 its response time discrete wavelengths incident light ranging 365 940 nm. The found have...
We present an optically induced remanent photostriction in BiFeO_{3}, resulting from the photovoltaic effect, which is used to modify ferromagnetism of Ni film a hybrid BiFeO_{3}/Ni structure. The 75% change coercivity achieved via optical and nonvolatile control. This photoferromagnetic effect can be reversed by static or ac electric depolarization BiFeO_{3}. Hence, strain dependent changes magnetic properties are written optically, erased electrically. Light-mediated straintronics...
Developing functional materials for optical remote control of magnetism can lead to faster, more efficient wireless data storage and sensing devices. In terms desired material properties, this development requires the combined optimization elastic interactions, low magnetic coercivity, a narrow linewidth ferromagnetic resonance establish low-loss dynamic functionalities. A general pathway achieve these requirements is still lacking. Here, we demonstrate that rare-earth trace element doping...
The composition of a natural single crystalline specimen from the province Potosí in Bolivia is found to be Fe0.8Mn0.2WO4. It crystallizes with primitive monoclinic NiWO4 structure type [space group P2/c, = 4.74751(6) Å, b 5.71335(7) c 4.96847(5) β 90.15(1)°]. Magnetic susceptibility and specific heat capacity measurements indicated that mineral undergoes multiple magnetic transitions: TN1 ≈ T\,cpN1 67(1) K, TN2 28(3) T\,cpN2 8(1) K. reduced entropy ≈R ln 3 upon high-temperature...
2D van der Waals materials and their heterostructures are a fantastic playground to explore emergent phenomena arising from electronic quantum hybridization effects. In the last decade, spin-dependant effect pushed this frontier further introducing magnetic proximity as promising tool for spintronic applications. Here uncharted proximity-controlled magnetoelectric in EuO/graphene heterostructure is unveiled. This obtained while creating new multiferroic hybrid with multifunctional...
A dielectric anomaly has been found near the incommensurate to commensurate antiferromagnetic phase transition (TN2=230 K) in YBaCuFeO5 ceramics, a compound which crystallizes an ordered perovskite structure. The existence of electric polarization below TN2 suggests magnetism induced charge effect that is also confirmed by its strong magnetic field dependence TN2. Accordingly, peak magnetodielectric indicates maximum susceptibility spin reorientation transition. Considering abundance...
Variable-temperature studies of the electronic structures four different Fe(II) spin crossover molecules, [Fe(H2B(pz)2)2(bipy)] (pz = pyrazol-1-yl, bipy 2,2′-bipyridine), [Fe(H2B(pz)2)2(phen)], [Fe(phen)2(NCS)2] (phen 9,10-phenantroline), and [Fe(PM-AzA)2(NCS)2] (PM-AzA 4-phenyldiazenyl-N-(pyridin-2-ylmethylene)aniline) by X-ray absorption spectroscopy (XAS), combined with electrical properties single crystal are presented. We show that both XAS signature state powdered samples dielectric...
Room temperature optoelectronic operations are demonstrated on a hybrid device based graphene and spin crossover nanoparticles, with non-volatile multiple memory states.
The hysteretic nature of the photovoltaic response and its nonlinear character can be used to optimize performance future ferroelectric-based solar cells.
Ultralow dimensionality of 2D layers magnifies their sensitivity to adjacent charges enabling even postprocessing electric control multifunctional structures. However, functionalizing remains an important challenge for on-demand device–property exploitation. Here we report that electrical and fully optical way write modifications the magnetoresistive response CVD-deposited graphene is achievable through electrostatics photoferroelectric substrate. For control, ferroelectric polarization...
${\text{FeVO}}_{4}$ has been studied by heat capacity, magnetic susceptibility, electric polarization and single-crystal neutron-diffraction experiments. The triclinic crystal structure is made of $S$-shaped clusters six ${\text{Fe}}^{3+}$ ions, linked ${\text{VO}}_{4}^{3\ensuremath{-}}$ groups. Two long-range ordering transitions occur at ${T}_{N1}=22\text{ }\text{K}$ ${T}_{N2}=15\text{ }\text{K}$. Both structures are incommensurate below ${T}_{N2}$, becomes weakly ferroelectric...
The ferroelectric properties of ${\text{MnWO}}_{4}$ single crystal have been investigated. Despite a relatively low remanent polarization, we show that the sample is ferroelectric. shape loop strongly depends on magnetic field and temperature. While its dependence does not directly correlate with magnetocapacitance effect before paraelectric transition, polarization supports magnetoelectric coupling.
Artificial superlattices of (BiFeO3)m(SrTiO3)m (m=1–10 unit cells) consisting multiferroic BiFeO3 and insulating SrTiO3 layers were fabricated on (100)-oriented substrates by pulsed laser ablation. The remnant polarization leakage current behavior these films studied varying the periodicity (8–80Å) superlattice. Compared to single layer thin films, was reduced a few orders magnitude increasing periodicity. Reduced intrinsic hysteresis observed confirmed analysis for all periodicities...
Ferroelectric materials are an alternative to semiconductor-based photovoltaics and offer the advantage of above bandgap photovoltage generation. However, there few known compounds, photovoltaic efficiencies remain low. Here, we report discovery a effect in undoped lead magnesium niobate--lead titanate crystal significant improvement response under suitable electric fields temperatures. The is maximum near electric-field-driven ferroelectric dipole reorientation, increases threefold Curie...
Achieving optical operation of logic elements, especially those that involve two-dimensional (2D) layers, could kick-start the long-awaited era computing. However, efficient modulation electronic properties 2D materials, including rewritable memory effect, is currently lacking. Here we report all-optical control conductivity graphene with write-erase yet under ultralow fluence. The competition between light-induced charge generation in a ferroelectric-photovoltaic substrate and relaxation...
Electric-field control of magnetism via an inverse magnetostrictive effect is alternative path toward improving energy-efficient storage and sensing devices based on a giant magnetoresistance effect. In this Letter, we report lateral electric-field driven strain-mediated modulation magnetotransport properties in Co/Cu/Py pseudo spin valve grown ferroelectric 0.7Pb[Mg1/3Nb2/3)]O3–0.3PbTiO3 substrate. We show decrease the ratio with increase electric field, which attributed to deviation Co...
An ABO3 perovskite multiferroic, where the B-site cation is responsible for magnetic properties and A-site with lone pair electron ferroelectric properties, was synthesized composition (La0.5Bi0.5)(Mn0.5Fe0.5)O3.09 at normal conditions. This oxide exhibits a ferromagnetic transition around 240 K well defined hysteresis loop, significant reversible remnant polarization below 67 similar to behavior. The interaction interpreted by Fe3+–O–Mn3+ antiferromagnetic Fe3+(Mn3+)–O–Fe3+(Mn3+)...