A5070347237- Physics of Superconductivity and Magnetism
- Advanced Condensed Matter Physics
- Nuclear Physics and Applications
- Magnetic properties of thin films
- High-pressure geophysics and materials
- Rare-earth and actinide compounds
- Atomic and Subatomic Physics Research
- Magnetic and transport properties of perovskites and related materials
- Superconducting Materials and Applications
- Block Copolymer Self-Assembly
- Superconductivity in MgB2 and Alloys
- Magnetic Properties of Alloys
- Theoretical and Computational Physics
- Iron-based superconductors research
- Quantum, superfluid, helium dynamics
- Advanced Polymer Synthesis and Characterization
- Hydrogels: synthesis, properties, applications
- Surfactants and Colloidal Systems
- Conducting polymers and applications
- Material Dynamics and Properties
- Analytical Chemistry and Sensors
- Advanced Sensor and Energy Harvesting Materials
- Polymer Surface Interaction Studies
- Electrochemical Analysis and Applications
- Polymer Nanocomposites and Properties
Institut Laue-Langevin
2016-2025
Lymphatic Education & Research Network
2022
The University of Tokyo
2021
Kyungpook National University
2021
Institut Langevin
1998-2009
Rutherford Appleton Laboratory
2004-2008
University of Leicester
2004-2008
Musée d'Art et d'Histoire de Fribourg
2008
Technical University of Munich
2008
University of Fribourg
2008
The microscopic magnetic field distribution in the mixed state of single-crystal ${\mathrm{Bi}}_{2.15}$${\mathrm{Sr}}_{1.85}$${\mathrm{CaCu}}_{2}$${\mathrm{O}}_{8+\mathrm{\ensuremath{\delta}}}$ has been measured using muon spin rotation technique. A study line shapes as a function temperature and gives evidence for an abrupt change flux-lattice structure which is attributed to presence melting B-T phase diagram. In addition, data suggest existence crossover above flux more 2D nature.
We report the discovery of topological magnetism in candidate magnetic Weyl semimetal CeAlGe. Using neutron scattering we find this system to host several incommensurate, square-coordinated multi-k[over →] phases below T_{N}. The properties a phase stable at intermediate fields parallel c axis are suggested by observation Hall effect. Our findings highlight CeAlGe as an exceptional for exploiting interplay between nontrivial topologies magnetization real space and nodes momentum space.
The D33 small-angle neutron scattering (SANS) instrument at the Institut Laue–Langevin (ILL) is most recent SANS to be built ILL. In a project beginning in 2005 and lasting seven years, concept has been developed, designed, manufactured installed. was commissioned with neutrons during second half of 2012, fully entering ILL user programme 2013. scientific case required that should provide wide dynamic range measured vector magnitude q , flexibility regard resolution, provision polarized 3 He...
The skyrmion lattice state (SkL), a crystal built of mesoscopic spin vortices, gains its stability via thermal fluctuations in all bulk host materials known to date. Therefore, existence is limited narrow temperature region below the paramagnetic state. This range can drastically increase systems with restricted geometries, such as thin films, interfaces and nanowires. Thermal quenching also promote SkL metastable over extended ranges. Here, we demonstrate more generally that proper choice...
Magnetic frustration in a chiral magnet stabilizes new disordered skyrmion phase over an extended temperature region.
We present an operando neutron reflectometry study on the electrochemical incorporation of lithium into crystalline silicon for battery applications. Neutron reflectivity is measured from ⟨100⟩ surface a single crystal which used as negative electrode in cell. The strong scattering contrast between Si and Li due to length leads precise depth profile within anode function time. cell can be uptake release over several cycles. Lithiation starts with formation enrichment zone during first charge...
Abstract Magnetic skyrmions, topological vortex-like spin textures, garner significant interest due to their unique properties and potential applications in nanotechnology. While they typically form a hexagonal crystal with distinct internal magnetisation textures known as Bloch- or Néel-type, recent theories suggest the possibility for direct transitions between skyrmion crystals of different lattice structures textures. To date however, experimental evidence these potentially useful...
The interface between ultrathin deuterated poly(methyl methacrylate) films on polystyrene substrates is subject to a dispersive force driven instability consisting of thermally excited capillary waves. We have studied this example liquid/liquid spinodal dewetting, using specular and off-specular neutron reflection measurements characterize the length scale growth rate buried, polymer interfaces.
The phase separation and molecular intermixing in poly(3-hexylthiophene) (P3HT)/[6,6]-phenyl-C61 butyric acid methyl ester (PCBM) bulk heterojunction thin films are investigated as a function of the overall PCBM content. structural length scales, sizes, miscibility ratio probed with grazing incidence small-angle neutron scattering (GISANS). content is varied between 9 67 wt %. For symmetric P3HT/PCBM ratio, which typically highly efficient photovoltaic devices, structure size 20 nm, largest...
The vertical sample-plane reflectometer D17 at the Institut Laue–Langevin in Grenoble, France, has undergone several major upgrades since its commissioning, which are summarized this article. three improvements (i) a new focusing guide, increasing usable flux on sample by factor of 2.5; (ii) beam polarizer and spin flippers, allowing for use polarized neutrons time-of-flight mode; (iii) detector with particularly uniform response under homogeneous exposure, improved stability...
The calculation of neutron reflectivity from raw time-of-flight data including instrumental corrections and an improved resolution is presented. theoretical calculations are compared with experimental measured on the vertical sample plane reflectometer D17 horizontal FIGARO at Institut Laue–Langevin (ILL), Grenoble, France. This article comprises mathematical body data-reduction software COSMOS which used FIGARO.
Abstract Magnetic skyrmions are topologically protected nanoscale spin textures with particle-like properties. In bulk cubic helimagnets, they appear under applied magnetic fields and condense spontaneously into a lattice in narrow region of the phase diagram just below ordering temperature, so-called A-phase. Theory, however, predicts to be locally stable wide range temperatures. Our neutron diffraction measurements reveal formation skyrmion states large areas diagram, from lowest...
Magnetic skyrmions are vortex-like topological spin textures often observed in structurally chiral magnets with Dzyaloshinskii-Moriya interaction. Among them, Co-Zn-Mn alloys a $\beta$-Mn-type structure host above room temperature. In this system, it has recently been found that persist over wide temperature and magnetic field region as long-lived metastable state, the skyrmion lattice transforms from triangular to square one. To obtain perspective on magnetism clarify how various properties...
The solidification and microstructural evolution during deposition, as well the structural post heat treatment, determine mechanical properties of wire-arc additively manufactured maraging stainless steels. In present work, we tune austenite reversion nanoscale precipitation treatment achieve an excellent combination strength ductility (ultimate tensile ~1340 MPa uniform elongation ~10.5 %). is studied through computational thermodynamics, electron microscopy, in situ small-angle neutron...
High resolution, neutron small angle scattering studies have been performed to investigate the low field $(B<250\mathrm{mT})$ region of phase diagram for vortex lattice in superconducting state ${\mathrm{YNi}}_{2}{\mathrm{B}}_{2}\mathrm{C}$. The data present clear evidence a reorientation transition from with diagonal rhombic unit cell along $[110]$ direction $[100]$ direction. Above this distorts under influence applied until apex becomes constant at some higher field. For...
We report here the first direct observations of a well ordered vortex lattice in bulk La(2-x)Sr(x)CuO(4+delta) single crystal (slightly overdoped, x = 0.17). Our small angle neutron scattering investigation mixed phase reveals crossover from triangular to square coordination with increasing magnetic field. The existence an intrinsic has never been observed high-temperature superconductors and is indicative coupling source anisotropy, such as those provided by d-wave order parameter or...
Reflectometry is a powerful technique for determining many physical quantities of stratified media, including length scales, densities and magnetism. However, experimentally neutron reflectometry in particular suffers from the relatively feeble brilliance sources compared with those X-rays, example. In this paper, simple modification existing data-reduction methods demonstrated, allowing quantitative improvements quality data. Using same algorithm, reflections non-flat surfaces can be...
Previous observations of metastable magnetic skyrmions have shown that close to the equilibrium pocket state has a short lifetime, and therefore rapid cooling is required generate significant skyrmion population at low temperatures. Here, we report lifetime in Cu$_2$OSeO$_3$ extended by factor 50 with introduction only 2.5% zinc doping, allowing over 50% survive when field-cooling rate just 1 K/min. Our systematic study suggests enhancement due removal spins non-magnetic dopant, which...