A5069857206- Magnetic properties of thin films
- Characterization and Applications of Magnetic Nanoparticles
- Magnetic Properties and Applications
- Magnetic Properties of Alloys
- Nuclear Physics and Applications
- Magnetic Properties and Synthesis of Ferrites
- Advanced Condensed Matter Physics
- Theoretical and Computational Physics
- Iron oxide chemistry and applications
- Physics of Superconductivity and Magnetism
- Geomagnetism and Paleomagnetism Studies
- Magnetic and transport properties of perovskites and related materials
- NMR spectroscopy and applications
- Shape Memory Alloy Transformations
- Surfactants and Colloidal Systems
- Metallic Glasses and Amorphous Alloys
- Atomic and Subatomic Physics Research
- Rare-earth and actinide compounds
- Material Dynamics and Properties
- Geophysical and Geoelectrical Methods
- Multiferroics and related materials
- Anodic Oxide Films and Nanostructures
- Micro and Nano Robotics
- Transition Metal Oxide Nanomaterials
- Force Microscopy Techniques and Applications
Science and Technology Facilities Council
2022-2025
Rutherford Appleton Laboratory
2022-2025
Institut Laue-Langevin
2015-2023
ISIS Neutron and Muon Source
2022
University of Luxembourg
2010-2021
Donetsk Institute for Physics and Engineering named after O.O. Galkin
2020
Heinz Maier-Leibnitz Zentrum
2019
Technical University of Munich
2019
Laboratoire Biologie à Grande Échelle
2018
CEA Grenoble
2018
Small-angle neutron scattering (SANS) is one of the most important techniques for microstructure determination, being utilized in a wide range scientific disciplines, such as materials science, physics, chemistry, and biology. The reason its great significance that conventional SANS probably only method capable probing structural inhomogeneities bulk on mesoscopic real-space length scale from roughly 1 to 300 nm. Moreover, exploitation spin degree freedom provides with unique sensitivity...
We investigated, in depth, the interrelations among structure, magnetic properties, relaxation dynamics and hyperthermia performance of nanoflowers. The nanoflowers are about 39 nm size, consist densely packed iron oxide cores. They display a remanent magnetization, which we explain by exchange coupling between cores, but observe indications for internal spin disorder. By polarized small-angle neutron scattering, unambiguously confirm that, on average, preferentially magnetized along one...
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...
Neutron-scattering experiments reveal a hexagonally crystallized form of noncollinear magnetic order in an itinerant magnet.
<italic>Magnetospirillum gryphiswaldense</italic> is a microorganism with the ability to biomineralize magnetite nanoparticles, called magnetosomes, and arrange them into chain that behaves like magnetic compass.
Here, we resolve the nature of moment coupling between 10-nm dimercaptosuccinic acid--coated magnetic nanoparticles. The individual iron oxide cores were composed $>95\phantom{\rule{0.16em}{0ex}}%$ maghemite and agglomerated to clusters. At room temperature ensemble behaved as a superparamagnet according M\"ossbauer magnetization measurements, however, with clear signs dipolar interactions. Analysis temperature-dependent ac susceptibility data in superparamagnetic regime indicates tendency...
We report small-angle neutron scattering studies of the lacunar spinel GaV$_4$S$_8$, which reveal long-wavelength magnetic states to be cycloidally modulated. This provides direct support for formation N\'eel-type skyrmions recently claimed exist in this compound. In striking contrast with all other bulk skyrmion host materials, upon cooling modulated transform into a ferromagnetic state. These results indicate including state, gain their stability from thermal fluctuations, while at lower...
We have studied the magnetization-reversal process of a Nd2Fe14B/Fe3B nanocomposite using small-angle neutron scattering. Based on computation autocorrelation function spin misalignment, we estimated characteristic size lC inhomogeneities around Nd2Fe14B nanoparticles. The quantity approaches constant value about 12.5 nm (∼average particle radius) at 14 T and takes maximum 18.5 coercive field −0.55 T. dependence can be described by model that into account convolution relationship between...
Abstract Smart windows in which the transmittance can be controlled on demand are a promising solution for reduction of energy use buildings. Windows often most inefficient part building, and so controlling has potential to significantly improve heating costs. Whilst numerous approaches exist, many suitable materials costly manufacture process new could have significant impact. Here we describe gel-based device is both photo- electrochromic. The gel matrix formed by self-assembly naphthalene...
The antisymmetric Dzyaloshinskii--Moriya interaction (DMI) plays a decisive role for the stabilization and control of chirality skyrmion textures in various magnetic systems exhibiting noncentrosymmetric crystal structure. A less studied aspect DMI is that this believed to be operative vicinity lattice imperfections crystalline materials, due local structural inversion symmetry breaking. If scenario leads an effect sizable magnitude, it implies introduces into very large class...
In a strong magnetic field, the cores of nanoparticles grow because realignment surrounding spins, challenging commonly held assumption constant nanoparticle moment.
Tuning the core–shell morphology of bimagnetic nanoparticles and its associated exchange bias behavior is a promising way to overcome superparamagnetic limit stabilize particle moment in extended time temperature ranges. The intraparticle magnetization distribution magnetic coupling between two phases, however, still unclear. We report significant nonzero CoxFe(1–x)O core native that typically considered antiferro- or paramagnetic. Co0.14Fe0.86O@Co0.4Fe2.4O4 (6 nm@2 nm)...
Introduction of non-DLVO forces by nonionic surfactants brings about fascinating changes in the phase behavior silica nanosuspensions. We show here that alterations interaction and wetting properties negatively charged nanoparticles (Ludox® LS) presence polyethylene oxide–polypropylene oxide–polyethylene oxide-based triblock copolymers called Pluronics lead to formation stable o/w Pickering emulsions interparticle attraction-induced thermoresponsive liquid–liquid separations. The results...
Abstract Neutron spin-echo techniques exploit Larmor precession of the neutron spin to encode either scattering angle or energy. These are powerful means extend measurable momentum transfer ( Q ) and energy E range in measurements. Standard small-angle (SANS) instruments sensitive a $$\approx$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mo>≈</mml:mo> </mml:math> 10–200 nm, whereas these allow study structures materials on length scales tens nm up $$\upmu$$...
Based on micromagnetic theory we have derived analytical expressions for the magnetic small-angle neutron scattering (SANS) cross section of a two-phase particle-matrix-type ferromagnet. The approach---valid close to saturation---provides access several features spin structure such as perturbing anisotropy and magnetostatic fields. Depending applied field magnitude $H_p$ relative $\Delta M$ jump in longitudinal magnetization at particle-matrix interface, observe variety angular anisotropies...
The structural and magnetic properties of a cobalt nanorod array have been studied by means field dependent small-angle neutron scattering (SANS). Measurement the unpolarized SANS cross section dΣ/dΩ saturated sample in two geometries where applied H is either perpendicular or parallel to wavevector k i incoming beam allows one separate nuclear from SANS, without employing usual sector-averaging procedure. analysis data state provides parameters (rod radius centre-to-centre distance) that...
We employ micromagnetic simulations to model the effect of pore-type microstructural defects on magnetic small-angle neutron scattering cross section and related pair-distance distribution function spherical nanoparticles. Our expression for energy takes into account isotropic exchange interaction, magnetocrystalline anisotropy, dipolar an externally applied field. The signatures role are highlighted a particle-size is studied. results serve as guideline experimentalist.
Time-dependent SANS experiments (TISANE) show that the orientation distribution of Ni nanorod colloids exposed to oscillating magnetic fields is frequency-independent.
The Dzyaloshinski-Moriya interaction (DMI) originates from the relativistic spin-orbit coupling, and in low-symmetry crystal structures without inversion centers it gives rise to antisymmetric magnetic exchange. DMI plays an important role formation of inhomogeneous spin such as long-wavelength spirals, vortex states, skyrmion textures. Even high-symmetry lattices, where DM term would normally vanish, is present vicinity any lattice defect can influence microstructure polycrystalline...
The magnetic response of spindle-shaped hematite (α-Fe<sub>2</sub>O<sub>3</sub>) nanoparticles was investigated by simultaneous small-angle and wide-angle X-ray scattering (SAXS/WAXS) experiments.