FS-CXS

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2019-08-29
16:35
OpenAccess [PUBDB-2019-03150] Journal Article
et al
Observation of a Chirality-Induced Exchange-Bias Effect
Chiral magnetism that manifests in the existence of skyrmions or chiral domain walls offers an alternative way for creating anisotropies in magnetic materials that might have large potential for application in future spintronic devices. Here we show experimental evidence for an alternative type of in-plane exchange-bias effect present at room temperature that is created from a chiral 90∘ domain wall at the interface of a ferrimagnetic-ferromagnetic $\mathrm{Dy-Co/Ni-Fe}$ bilayer system [...]
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ddc:530
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2019-08-29
15:37
OpenAccess [PUBDB-2019-03147] Journal Article
et al
Direct Visualization of Spatial Inhomogeneity of Spin Stripes Order in $\mathrm{La_{1.72}Sr_{0.28}NiO_{4}}$
In several strongly correlated electron systems, the short range ordering of defects, charge and local lattice distortions are found to show complex inhomogeneous spatial distributions. There is growing evidence that such inhomogeneity plays a fundamental role in unique functionality of quantum complex materials [...]
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2019-08-25
20:30
Embargoed OpenAccess [PUBDB-2019-03101] Journal Article
et al
Anomalous Dynamics of Concentrated Silica-PNIPAm Nanogels
We present the structure and dynamics of highly concentrated core–shell nanoparticles composed of a silica core and a poly(N-isoproylacrylamide) (PNIPAm) shell suspended in water. With X-ray photon correlation spectroscopy, we are able to follow dynamical changes over the volume phase transition of PNIPAm at LCST = 32 °C. [...]
Published on 2019-08-21. Available in OpenAccess from 2020-08-21.: Download fulltextPDF Download fulltextPDF (PDFA); Restricted: Download fulltextPDF Download fulltextPDF (PDFA);
ddc:530
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2019-07-26
18:23
OpenAccess [PUBDB-2019-02852] Journal Article
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Local orientational order in self-assembled nanoparticle films: the role of ligand composition and salt
An X-ray cross-correlation study of the local orientational order in self-assembled films made from PEGylated gold nanoparticles is presented. The local structure of this model system is dominated by four- and sixfold order. [...]
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ddc:540
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2019-05-17
10:29
OpenAccess [PUBDB-2019-02307] Journal Article
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Compact hard X-ray split-and-delay line for studying ultrafast dynamics at free-electron laser sources
A compact hard X-ray split-and-delay line for studying ultrafast dynamics at free-electron laser sources is presented. The device is capable of splitting a single X-ray pulse into two fractions to introduce time delays from −5 to 815 ps with femtosecond resolution [...]
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ddc:550
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2019-04-17
13:27
Embargoed OpenAccess [PUBDB-2019-02010] Journal Article
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Monitoring Nanocrystal Self-Assembly in Real Time Using In Situ Small-Angle X-Ray Scattering
Small 15(20), 1900438 () [10.1002/smll.201900438]  GO
Self‐assembled nanocrystal superlattices have attracted large scientific attention due to their potential technological applications. However, the nucleation and growth mechanisms of superlattice assemblies remain largely unresolved due to experimental difficulties to monitor intermediate states. [...]
Published on 2019-04-16. Available in OpenAccess from 2020-04-16.: Download fulltextPDF Download fulltextPDF (PDFA); Restricted: Download fulltextPDF Download fulltextPDF (PDFA);
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2019-04-09
10:50
OpenAccess [PUBDB-2019-01910] Preprint/Report
et al
Scientific Opportunities with an X-ray Free-Electron Laser Oscillator
[arXiv:1903.09317]
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An X-ray free-electron laser oscillator (XFELO) is a new type of hard X-ray source that would produce fully coherent pulses with meV bandwidth and stable intensity. The XFELO complements existing sources based on self-amplified spontaneous emission (SASE) from high-gain X-ray free-electron lasers (XFEL) that produce ultra-short pulses with broad-band chaotic spectra [...]
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2019-03-22
14:32
OpenAccess [PUBDB-2019-01681] Journal Article
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Spatial and temporal pre-alignment of an X-ray split-and-delay unit by laser light interferometry
We present a novel experimental setup for performing a precise pre-alignment of a hard X-ray split-and-delay unit based on low coherence light interferometry and high-precision penta-prisms. A split-and-delay unit is a sophisticated perfect crystal-optics device that splits an incoming X-ray pulse into two sub-pulses and generates a controlled time-delay between them. [...]
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2019-03-18
17:59
Embargoed OpenAccess [PUBDB-2019-01592] Journal Article
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In situ small-angle X-ray scattering environment for studying nanocrystal self-assembly upon controlled solvent evaporation
We present a sample environment for the investigation of nanoparticle self-assembly from a colloidal solution via controlled solvent evaporation using in situ small-angle X-ray scattering. Nanoparticles form ordered superlattices in the evaporative assembly along the X-ray transparent windows of a three-dimensional sample cell. [...]
Published on 2019-03-18. Available in OpenAccess from 2020-03-18.: Download fulltextPDF Download fulltextPDF (PDFA); Restricted: Download fulltextPDF Download fulltextPDF (PDFA);
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2019-01-04
11:07
OpenAccess [PUBDB-2019-00039] Dissertation / PhD Thesis

Structure and dynamics of glass-forming fluids
134 pp. () [10.3204/PUBDB-2019-00039] = Dissertation, University of Hamburg, 2018  GO
Colloidal dispersions are ubiquitous in our daily life and find numerous applications in industry and science. They are in particular used as a model system to study phase transitions in soft matter systems. [...]
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