A5015852509- Magnetic properties of thin films
- Nuclear Physics and Applications
- Magnetic and transport properties of perovskites and related materials
- Physics of Superconductivity and Magnetism
- Magnetic Properties and Applications
- Magnetic Properties of Alloys
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Advanced Condensed Matter Physics
- ZnO doping and properties
- Metal and Thin Film Mechanics
- Metallic Glasses and Amorphous Alloys
- Theoretical and Computational Physics
- Nuclear reactor physics and engineering
- High-pressure geophysics and materials
- Boron and Carbon Nanomaterials Research
- Rheology and Fluid Dynamics Studies
- Magneto-Optical Properties and Applications
- Microstructure and mechanical properties
- Characterization and Applications of Magnetic Nanoparticles
- Rare-earth and actinide compounds
- Heusler alloys: electronic and magnetic properties
- Thermodynamic and Structural Properties of Metals and Alloys
- Supramolecular Self-Assembly in Materials
- Shape Memory Alloy Transformations
Institut Laue-Langevin
2013-2025
Uppsala University
2016-2024
Lund University
2016-2018
Ruhr University Bochum
2012-2016
Institut Langevin
2007-2012
University of Vienna
2008-2009
University of Oxford
2009
Using neutron reflectometry and resonant x-ray techniques we studied the magnetic proximity effect (MPE) in superlattices composed of superconducting YBa2Cu3O7 ferromagnetic-metallic La0.67Ca0.33MnO3 or ferromagnetic-insulating LaMnO(3+δ). We find that MPE strongly depends on electronic state manganite layers, being pronounced for almost absent also detail change depth profile due to provide evidence its intrinsic nature.
The magnetization reversal processes are discussed for exchange-coupled ferromagnetic hard/soft bilayers made from Co0.66Cr0.22Pt0.12 (10 and 20 nm)/Ni (from 0 to 40 nm) films with out-of-plane in-plane magnetic easy axes respectively, based on room temperature hysteresis loops first-order curve analysis. On increasing the Ni layer thicknesses, axis of bilayer reorients in-plane. An exchange bias effect, consisting a shift minor along field axis, was observed at after saturation. This effect...
A new neutron reflectometer SuperADAM has recently been built and commissioned at the Institut Laue-Langevin, Grenoble, France. It replaces previous ADAM. The instrument uses a solid state polarizer/wavelength filter providing highly polarized (up to 98.6%) monochromatic flux of 8 × 104 n cm−2 s−1 with monochromatization Δλ/λ = 0.7% angular divergence Δα 0.2 mrad. includes both single position sensitive detectors. detector allows simultaneous measurement specular reflection off-specular...
We have clarified the origin of magnetically dead interface layer formed in yttrium iron garnet (YIG) films grown at above 700{\deg}C onto gadolinium gallium (GGG) substrate by means laser molecular beam epitaxy. The diffusion-assisted formation a Ga-rich region YIG / GGG is demonstrated composition depth profiling performed X-ray photoelectron spectroscopy, secondary ion mass spectroscopy and neutron reflectometry. Our finding sharp contrast to earlier expressed assumption that Gd acts as...
The formation, phase relations, crystal chemistry and physical properties were investigated for the solid solution deriving from binary clathrate with a solubility limit of 8 Zn atoms per formula unit at 800 °C ( is vacancy). Single-crystal x-ray data throughout homogeneity region confirm type I structure cubic primitive space group .
Magnetic Weyl semimetals are newly discovered quantum materials with the potential for use in spintronic applications. Of particular interest is cubic Heusler compound Co2MnGa due to its inherent magnetic and topological properties. This work presents structural, electronic properties of magnetron co-sputtered thin films, thicknesses ranging from 10 80 nm. Polarized neutron reflectometry confirmed a uniform magnetization through films. Hard x-ray photoelectron spectroscopy revealed high...
We report investigations of the magnetic textures in periodic multilayers [Pt(1 nm)/(CoFeB(0.8 nm)/Ru(1.4 nm)]
We have investigated the structure and magnetism of self-assembled, 20 nm diameter iron oxide nanoparticles covered by an oleic acid shell for scrutinizing their structural magnetic correlations. The were spin-coated on Si substrate as a single monolayer stack 5 ML forming multilayer. X-ray scattering (reflectivity grazing incidence small-angle scattering) confirms high in-plane hexagonal correlation good layering property nanoparticles. Using polarized neutron reflectivity we also...
Single-crystal CrB2/TiB2 diboride superlattices with well-defined layers are promising candidates for neutron optics. However, excess B in sputter-deposited TiBy using a single TiB2 target deteriorates the structural quality of CrBx/TiBy (0001) superlattices. We study influence co-sputtering + Ti on stoichiometry and crystalline 300-nm-thick Al2O3(0001) substrates grown by DC magnetron sputter epitaxy at growth-temperatures TS ranging from 600 to 900 °C. By controlling relative applied...
This study investigates the effects of 11B4C co-sputtering on structural and optical properties Fe/Si stacked multilayers, with a focus neutron supermirror applications. X-ray reflectivity techniques reveal that incorporation improves interface sharpness, reduces roughness, enhances for all multilayer periods. Neutron measurements show reduced spin-flip intensities, while wafer-curvature indicate 50% reduction in internal stress, allowing higher mechanical stability multilayers. These...
Using polarized neutron reflectometry (PNR) we have investigated a YBa2Cu3O7(10nm)/La2/3Ca1/3MnO3(9nm)]10 (YBCO/LCMO) superlattice grown by pulsed laser deposition on La0.3Sr0.7Al0.65Ta0.35O3 (LSAT) substrate. Due to the high structural quality of and substrate, specular reflectivity signal extends with signal-to-background ratio beyond fourth order Bragg peak. This allows us obtain more detailed reliable information about magnetic depth profile than in previous PNR studies similar...
Like high-rise apartments for bits, stacked structures offer a means to increase the areal density of components on computer chips, despite physical limits encountered at nanoscale. The authors demonstrate series back-to-back Fe/MgO magnetic tunnel junctions with tunable interlayer coupling and discrete layer-by-layer switching, opening path three-dimensional storage logic devices.
Ferromagnetic domain patterns and three-dimensional domain-wall configurations in thin CoCrPt films with perpendicular magnetic anisotropy were studied detail by combining force microscopy polarized neutron reflectometry micromagnetic simulations. With the first method, lateral dimension of domains alternative magnetization directions normal to surface separated walls 20-nm-thick determined good agreement Quantitative analysis data on shows that consist a Bloch wall center film, which is...
An increase of the magnetic moment in superconductor/ferromagnet (S/F) bilayers V(40 nm)/F (, Co(3 nm), Ni(3 nm)) was observed using SQUID magnetometry upon cooling below superconducting transition temperature TC fields 10 Oe to 50 applied parallel sample surface. A similar increase, often called paramagnetic Meissner effect (PME), before various superconductors and systems. To explain PME presented S/F a model based on row vortices located at interface is proposed. According induced...
We prepared monolayers of iron oxide nanoparticles via self-assembly on a bare silicon wafer and vanadium film sputter deposited onto plane sapphire substrate. The magnetic configuration in such dense assembly was investigated by polarized neutron reflectivity. A theoretical model fit shows that the moments form quasi domain-like configurations at remanence. This is attributed to dipolar coupling amongst nanoparticles.
In this last of a series three papers on the development an advanced solid-state neutron polarizer, we present final construction polarizer and results its commissioning. The uses spin-selective reflection neutrons by interfaces coated with polarizing super-mirrors. is built entirely in-house for PF1B cold beam facility at Institut Max von Laue–Paul Langevin (ILL). It has been installed in casemate tested under real conditions. average transmission “good” spin component measured to be...
It is reported superconductivity in Nb5Ge3C0.3, an interstitial carbide compound. The temperature dependence of the electrical resistivity, ac-susceptibility, and heat capacity (HC) indicate that a bulk type-II appears at TC = 15.3 K. Magneto-resistance measurements suggest upper critical field BC2 ∼ 10.6 T coherence length ξ 55 Å zero temperature. Neutron diffraction analyzes locate carbon atoms 2b site Mn5Si3 type-structure. Heat data below are well described by BCS theory. size jump good...
We report the detection and quantification of nuclear spin incoherent scattering from hydrogen occupying interstitial sites in a thin film vanadium. The neutron wave field is enhanced quantum resonator with magnetically switchable boundaries. Our results provide pathway for study dynamics at surfaces ultrathin films using inelastic and/or quasielastic methods.