A5061625405- Magnetism in coordination complexes
- Molecular Junctions and Nanostructures
- Quantum and electron transport phenomena
- Lanthanide and Transition Metal Complexes
- Crystallization and Solubility Studies
- Magnetic properties of thin films
- X-ray Diffraction in Crystallography
- Magnetic and transport properties of perovskites and related materials
- Fullerene Chemistry and Applications
- Crystallography and molecular interactions
- Advanced Condensed Matter Physics
- Organic and Molecular Conductors Research
- High voltage insulation and dielectric phenomena
- Porphyrin and Phthalocyanine Chemistry
- Graphene research and applications
- Advanced NMR Techniques and Applications
- Ferroelectric and Negative Capacitance Devices
- Metal-Catalyzed Oxygenation Mechanisms
- Metal complexes synthesis and properties
- Organometallic Complex Synthesis and Catalysis
- Advanced Memory and Neural Computing
- Quantum-Dot Cellular Automata
- Electronic and Structural Properties of Oxides
- Electrical Fault Detection and Protection
- Power Transformer Diagnostics and Insulation
Paul Scherrer Institute
2018-2025
Swiss Light Source
2018-2023
ABB (Switzerland)
2022-2023
Institut de Physique et Chimie des Matériaux de Strasbourg
2015-2018
Université de Strasbourg
2015-2018
Centre National de la Recherche Scientifique
2015-2018
Synchrotron soleil
2015-2017
Abstract The realization of spin‐crossover (SCO)‐based applications requires study the spin‐state switching characteristics SCO complex molecules within nanostructured environments, especially on surfaces. Except for a very few cases, surface‐bound thin molecular film is either quenched or heavily altered due to: (i) molecule–surface interactions and (ii) differing intermolecular in films relative to bulk. By fabricating complexes weakly interacting surface, interfacial quenching problem...
Thin films of the spin-crossover (SCO) molecule Fe{[Me2Pyrz]3BH}2 (Fe-pyrz) were sublimed on Si/SiO2 and quartz substrates, their properties investigated by X-ray absorption photoemission spectroscopies, optical absorption, atomic force microscopy, superconducting quantum interference device. Contrary to previously studied Fe(phen)2(NCS)2, are not smooth but granular. The thin qualitatively retain typical SCO powder sample (SCO, thermal hysteresis, soft induced excited spin-state trapping,...
Abstract The stability of magnetic information stored in surface adsorbed single‐molecule magnets is critical interest for applications nanoscale data storage or quantum computing. present study combines X‐ray circular dichroism, density functional theory and magnetization dynamics calculations to gain deep insight into the substrate dependent relevant relaxation mechanisms. dichroism reveals opening a butterfly‐shaped hysteresis DyPc 2 molecules on magnesium oxide closed loop bare silver...
We experimentally and theoretically show that the magnetic coupling at room temperature between paramagnetic Mn within manganese phthalocyanine molecules a Co layer persists when separated by Cu spacer. The molecule's magnetization amplitude direction can be tuned varying Cu-spacer thickness evolves according to an interlayer exchange mechanism. Ab initio calculations predict highly spin-polarized density of states Fermi level this metal-molecule interface, thereby strengthening prospective...
The bistability of spin-crossover complexes on surfaces is great interest for potential applications. Using X-ray absorption spectroscopy, we investigated the properties [Fe(pypyr(CF3)2)2(phen)] (pypyr = 2-(2′-pyridyl)pyrrolide, phen 1,10-phenanthroline), a vacuum-evaporable Fe(II) complex, in direct contact to set substrates. electronic these substrates range from metallic semiconducting. While dissociation observed metal surfaces, efficient light-induced switching realized semimetallic and...
Fullerene single molecule magnets (SMMs) DySc2N@C80 and Dy2ScN@C80 are functionalized via a 1,3-dipolar cycloaddition with surface-anchoring thioether groups. The SMM properties of Dy-fullerenes substantially affected by the cycloaddition. Submonolayers physisorbed derivatives exhibit magnetic hysteresis on an Au(111) surface at 2 K as revealed X-ray circular dichroism.
Magnetic hysteresis is demonstrated for monolayers of the single-molecule magnet (SMM) Dy
Preparing thin films of molecular polymetallic materials remains one the current limitations in implementation complexes into devices. The hurdle is tackled here using an electrochemical route for depositing cyanido-bridged complex {Tl⊂[FeII(2-TPhTp)(CN)3]4[CoIII(Tp)]3[CoII(Tp)]}(1) (where 2-TPhTp = [4-(2-thienyl)Phenyl]tris(pyrazol-1-yl)borate; and Tp hydrotris(pyrazol-1-yl)borate), functionalized with thiophene groups, on conductive surface (Pt/mica). Cyclic voltammograms show that pattern...
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...
Materials science and device studies have, when implemented jointly as “operando” studies, better revealed the causal link between properties of device's materials its operation, with applications ranging from gas sensing to information energy technologies. Here, a further step that maximizes this link, paper focuses on electronic those atoms drive operation by using it read out property. It is demonstrated how method can reveal insight into macroscale, industrial‐grade microelectronic...
We have studied the zero-dimensional cubane molecular correspondent of a Prussian blue analogue Cs–Fe4Co4 at low temperature and high magnetic field by means L-edge X-ray absorption spectroscopy circular dichroism. probe electronic structures Fe Co separately upon light irradiation, which allows us to observe directly electron transfer coupled spin transition phenomenon within cubes investigate nature metastable photoexcited state. The moments in state are found be M = 1.3μB (Mspin 0.59μB...
Spin‐polarized charge transfer at the interface between a ferromagnetic (FM) metal and molecule can lead to coupling high spin polarization room temperature. The magnetic properties of these interfaces not only alter those ferromagnet but also stabilize molecular chains with interesting opportunities toward quantum computing. With aim enhance an organic spintronic device's functionality, external control over this may thus be achieved by altering ferromagnet/molecule interface's properties....
Abstract The organic spinterface describes the spin‐polarized properties that develop, due to charge transfer, at interface between a ferromagnetic metal (FM) and molecules of an semiconductor. However, assembling this may degrade its constituents. To circumvent issue, one can separate molecular FM films using less reactive nonmagnetic (NM). Spin‐resolved photoemission spectroscopy measurements on prototypical system Co(001)//Cu/Mn‐phthalocyanine (MnPc) reveal room temperature high spin...
Affordable calculations of X-ray magnetic circular dichroism and linear spectra lanthanide ions purely based on structural input are difficult to achieve. Here we report the successful application ligand-field density-functional theory obtain an exquisite reproduction experimental spectra. As a testbed use TbPc2 single-molecule magnets flat substrate.
The design and the first experiments are described of a versatile cryogenic insert used for its electrical transport capabilities. is designed cryomagnet installed on DEIMOS beamline at SOLEIL synchrotron dedicated to magnetic characterizations through X-ray absorption spectroscopy (XAS) measurements. This development was spurred by multifunctional properties novel materials such as multiferroics, in which, example, orders intertwined may be probed using XAS. thus enables XAS situ probe this...
A novel hybrid NP-Dy<sub>12</sub> system presents an enhancement of the magnetization hysteresis with respect to isolated components while retaining morphological characteristics parent NPs.
We demonstrate the stability of ferromagnetic order one unit cell thick optimally doped manganite (La0.7Ba0.3MnO3, LBMO) epitaxially grown between two layers SrRuO3 (SRO) by using x-ray magnetic circular dichroism. At low temperature, LBMO shows an inverted hysteresis loop due to strong antiferromagnetic coupling SRO. Moreover, above SRO TC, still exhibits remanence. Density Functional Theory calculations show that coherent interfaces with hinder electronic confinement and enables increase...
Abstract Magnetic hysteresis is demonstrated for monolayers of the single‐molecule magnet (SMM) Dy 2 ScN@C 80 deposited on Au(111), Ag(100), and MgO|Ag(100) surfaces by vacuum sublimation. The topography electronic structure adsorbed Au(111) were studied STM. X‐ray magnetic CD studies show that exhibit similarly broad independent substrate used, but orientation ScN cluster depends strongly surface. DFT calculations extent interaction fullerene molecules with surface increasing dramatically...
Spin-polarized charge transfer between a ferromagnet and molecule can promote molecular ferromagnetism <sup>1, 2</sup> hybridized interfacial states<sup>3, 4</sup>. Observations of high spin-polarization Fermi level states at room temperature5 designate such interfaces as very promising candidate toward achieving highly spin-polarized, nanoscale current source temperature, when compared to other solutions half-metallic systems solid-state tunnelling over the past decades. We will discuss...
We investigate the temperature dependence of dielectric withstand a specific gas mixture consisting C5-fluoroketone (C5-FK) and air below its dew point. Both lightning impulse (LI) ac are investigated. Using standard testing techniques, it is found that stays constant until point then decreases following predicted for concentration fluoroketone at given temperature. On contrary, when measuring LI using common approach, one does not find decrease but instead, in certain cases, an increase...
The dielectric performance of a vacuum interrupter (VI) is critical parameter for protecting the electrical grid against overvoltages and reliable application. A common approach to minimize maximum field stress in VI freestanding case. This article demonstrates how vapor shield potential determines electric system. importance capacitive coupling between ground highlighted it demonstrated increasing this leads an increase intensity around contacts. symmetry breaking versus voltage feeding...
The two-dimensional electron system (2DES) located at the surface of strontium titanate (STO) and several other STO-based interfaces has been an established platform for study novel physical phenomena since its discovery. Here we report how interfacing STO tetracyanoquinodimethane (TCNQ) results in a charge transfer that depletes number free carriers surface, with strong impact on electronic structure. Our paves way efficient tuning properties, which promises applications framework...