A5048503851- Electronic and Structural Properties of Oxides
- Semiconductor materials and devices
- Quantum and electron transport phenomena
- Magnetic and transport properties of perovskites and related materials
- Multiferroics and related materials
- Ferroelectric and Piezoelectric Materials
- Molecular Junctions and Nanostructures
- Magnetic properties of thin films
- Magnetism in coordination complexes
- Advanced Condensed Matter Physics
- Advanced Thermodynamics and Statistical Mechanics
- Semiconductor Quantum Structures and Devices
- Nanowire Synthesis and Applications
- Porphyrin and Phthalocyanine Chemistry
- Magnetic Properties and Applications
- Acoustic Wave Resonator Technologies
- Magneto-Optical Properties and Applications
- Topological Materials and Phenomena
- Polydiacetylene-based materials and applications
- Particle Accelerators and Free-Electron Lasers
- TiO2 Photocatalysis and Solar Cells
- Solid-state spectroscopy and crystallography
- Ferroelectric and Negative Capacitance Devices
- Electron Spin Resonance Studies
- Magnetic Properties of Alloys
Institut de Physique et Chimie des Matériaux de Strasbourg
2020-2025
Centre National de la Recherche Scientifique
2010-2025
Université de Strasbourg
2020-2025
Synchrotron soleil
2014-2022
Elettra-Sincrotrone Trieste S.C.p.A.
2015-2020
Istituto Officina dei Materiali
2020
University of British Columbia
2020
École Centrale de Lyon
2010-2015
Institut des Nanotechnologies de Lyon
2010-2015
AREA Science Park
2014-2015
Spin-crossover metal complexes are highly promising magnetic molecular switches for prospective molecule-based devices. The spin-crossover photoswitches developed so far operate either at very low temperatures or in the liquid phase, which hinders practical applications. Herein, we present a iron(II) complex that can be switched between paramagnetic high-spin and diamagnetic low-spin states with light room temperature solid state. reversible photoswitching is induced by alternating...
TiO 2 is commonly used as the active switching layer in resistive random access memory. The electrical characteristics of these devices are directly related to fundamental conditions inside and at interfaces between it surrounding electrodes. However, complex disentangle effects film “bulk” properties interface phenomena. present work uses hard X‐ray photoemission spectroscopy (HAXPES) different excitation energies distinguish regimes. Changes found affect entire thin film, but most dramatic...
We report on epitaxial growth of Bi2Se3 topological insulator thin films by Pulsed Laser Deposition (PLD). X-ray diffraction investigation confirms that with a single (001)-orientation can be obtained several substrates in narrow (i.e., 20 °C) range deposition temperatures and at high pressure 0.1 mbar). However, only grown (001)-Al2O3 show an almost-unique in-plane orientation. In-situ spin-resolved angular resolved photoemission spectroscopy experiments, performed the NFFA-APE facility...
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...
Abstract Thin films of a molecular spin crossover (SCO) Iron(II) complex featuring high transition temperature are grown by sublimation in vacuum on TS Au and investigated X‐ray UV photoelectron spectroscopies. Temperature‐dependent studies demonstrate that the thermally induced behavior is preserved thin films. A large‐area ultrathin switchable vertical tunnel junction with top electrodes liquid eutectic gallium indium, for which spin‐state switching induces two orders magnitude change...
We report the study of anatase TiO2(001)-oriented thin films grown by pulsed laser deposition on LaAlO3(001). A combination in situ and ex methods has been used to address both origin Ti3+-localized states their relationship with structural electronic properties surface subsurface. Localized in-gap are analyzed using resonant X-ray photoelectron spectroscopy related Ti3+ configuration, homogeneously distributed over entire film thickness. find that an increase oxygen pressure corresponds...
Abstract In the rapidly growing field of spintronics, simultaneous control electronic and magnetic properties is essential, perspective building novel phases directly linked to tuning parameters, for example, thickness doping. Looking at relevant effects in interface-driven reduced symmetry a surface interface corresponds severe modification overlap electron orbitals, that is, change hybridization. Here we report chemically magnetically sensitive depth-dependent analysis two paradigmatic...
Controlling magnetism by using electric fields is a goal of research towards novel spintronic devices and future nano-electronics. For this reason, multiferroic heterostructures attract much interest. Here we provide experimental evidence, supporting DFT analysis, transition in La0.65Sr0.35MnO3 (LSMO) thin film to stable ferromagnetic phase, that induced the structural strain properties ferroelectric BaTiO3 (BTO) substrate, which can be modified applying external fields. X-ray Magnetic...
Here, we present an integrated ultra-high vacuum apparatus-named MBE-Cluster -dedicated to the growth and in situ structural, spectroscopic, magnetic characterization of complex materials. Molecular Beam Epitaxy (MBE) metal oxides, e.g., manganites, deposition patterned metallic layers can be fabricated characterized by reflection high-energy electron diffraction, low-energy Auger spectroscopy, x-ray photoemission azimuthal longitudinal magneto-optic Kerr effect. The temperature controlled...
Abstract Spin‐crossover metal complexes are highly promising magnetic molecular switches for prospective molecule‐based devices. The spin‐crossover photoswitches developed so far operate either at very low temperatures or in the liquid phase, which hinders practical applications. Herein, we present a iron(II) complex that can be switched between paramagnetic high‐spin and diamagnetic low‐spin states with light room temperature solid state. reversible photoswitching is induced by alternating...
One promising route toward encoding information is to utilize the two stable electronic states of a spin crossover molecule. Although this property clearly manifested in transport across single molecule junctions, evidence linking charge solid-state device molecular film's state has thus far remained indirect. To establish link, we deploy materials-centric and device-centric operando experiments involving X-ray absorption spectroscopy. We find correlation between temperature dependencies...
We investigated the influence of surfaces in formation different crystal structures a spin crossover compound, namely [Fe(L)2] (LH: (2-(pyrazol-1-yl)-6-(1H-tetrazol-5-yl)pyridine), which is neutral compound thermally switchable around room temperature. observed that surface induces two structures, exhibit opposite transitions, i.e. on heating them up to transition temperature, one polymorph switches from high low and second irreversibly spin. attributed this inversion presence water...
Recent theory and experiments have showcased how to harness quantum mechanics assemble heat/information engines with efficiencies that surpass the classical Carnot limit. So far, this has required atomic are driven by cumbersome external electromagnetic sources. Here, using molecular spintronics, an implementation is both electronic autonomous proposed. The spintronic engine heuristically deploys several known assets having a chain of spin qubits formed paramagnetic Co center phthalocyanine...
We investigate the structural, chemical, and magnetic properties on BiFe0.5Cr0.5O3 (BFCO) thin films grown (001) (110) (111) oriented SrTiO3 (STO) substrates by x-ray circular dichroism diffraction. show how highly pure BFCO films, differently from theoretically expected ferrimagnetic behavior, present a very weak dichroic signal at Cr Fe edges, with both moments aligned external field. Chemically sensitive hysteresis loops no hysteretic behavior saturation up to 6.8 T. The linear responses...
New strategy for room temperature magnetic gas sensing based on magnetoelectrically-coupled hybrids. The sensor is sensitive, fast and cost-effective. allowed thanks to the magneto-electric coupling at interface.
A new ultralow-temperature setup dedicated to soft X-ray absorption spectroscopy and magnetic circular dichroism (XMCD) experiments is described. Two experiments, performed on the DEIMOS beamline (SOLEIL synchrotron), demonstrate outstanding performance of this platform in terms lowest achievable temperature under irradiation ( T = 220 mK), precision controlling during measurements as well speed cooling-down warming-up procedures. Moreover, owing design setup, eddy-current power strongly...
Integrating III-V semiconductors on Si is one of the major challenges epitaxial growth and presents important applicative interest. We describe here an approach based use crystalline SrTiO3 (STO)/Si templates. The structural optical properties InAsP/InP quantum well heterostructures grown directly STO/Si templates are compared. Using strongly improves heterostructure, allows observing room-temperature photoluminescence from well.
Giant strain-driven magnetoelectric coupling of Co/ZnO nanorods. Under ±2 V, the coercivity is reversibly reduced a factor 5.
This review presents a bird's eye view of the current understanding on various forms hydrogen bonded organic ferroelectric croconic acid.
Magnetic nanoparticles are central to the development of efficient hyperthermia treatments, magnetic drug carriers, and multimodal contrast agents. While properties small crystalline iron oxide well understood, superparamagnetic size limit constitutes a significant barrier for further reduction. Iron (oxy)hydroxide phases, albeit very common in natural world, far less studied, generally due their poor crystallinity. Templating ultrasmall on substrates such as graphene is promising method...
Abstract Vertically aligned nanocomposites (VANs) of metal/oxide type have recently emerged as a novel class heterostructures with great scientific and technological potential in the fields nanomagnetism, multiferroism, catalysis. One salient features these hybrid materials is their huge vertical interface, which plays key role determining final magnetic and/or transport properties composite structure. However, contrast to well‐studied planar counterparts, detailed information on structural...
This work presents a study of the epitaxial growth Ge on Si (111) using Gd2O3 crystalline template. A smooth two-dimensional layers is obtained from coalescence initially three-dimensional islands grown in Volmer–Weber mode. takes its bulk lattice parameter at very early stages growth. detailed x-ray pole figure analysis reveals that relationship between and substrate [1–10]Ge(111)∥[−110]Gd2O3(111)∥[1–10]Si(111) microtwins are formed layer.
A study of epitaxial growth GaAs islands on (2×1) reconstructed SrTiO3(001) surface is presented. Under low arsenic partial pressures (PAs), are (001)-oriented, and increasing PAs leads to the progressive formation (111)-oriented islands. This results from competition between Ga–O Ga–As bonds at early stages growth, as supported by analysis evolution island density with respect PAs.
Soft x-ray synchrotron-radiation photoemission has been used to study the interface between Ge and SrTiO${}_{3}$(100). Mapping as annealing temperature varies reveals that adsorption is strongly dependent on SrTiO${}_{3}$ surface's initial composition: richer surface in TiO${}_{x}$, more wets STO surface. Time-resolved enabled us monitor bonding desorption a function of temperature. As increases, Ge${}^{2+}$, Ge${}^{+}$, Ge${}^{0}$ component evolution adatoms, initially bonded two (or more)...
Ultrathin ${\mathrm{Co}}_{x}{\mathrm{Ni}}_{1\ensuremath{-}x}$ alloy nanowires vertically embedded in ${\mathrm{SrTiO}}_{3}/{\mathrm{SrTiO}}_{3}\phantom{\rule{0.16em}{0ex}}(001)$ thin films were grown using a self-assembly approach based on sequential pulsed laser deposition. Due to vertical epitaxial coupling of the metallic and oxide phases, large average tensile strain up 4% arises within nanowires, which is evidenced combination x-ray diffraction transmission electron microscopy....