Preprints

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2020-12-31
11:28
OpenAccess [FZJ-2020-05304] Preprint

Towards Reflectivity profile inversion through Artificial Neural Networks
The goal of Specular Neutron and X-ray Reflectometry is to infer materials Scattering Length Density (SLD) profiles from experimental reflectivity curves. This paper focuses on investigating an original approach to the ill-posed non-invertible problem which involves the use of Artificial Neural Networks (ANN). [...]
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2020-07-31
09:20
[IMPULSE-2020-00231] Preprint
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Analysis of cylindrically and spherically embossed flux barriers in non-oriented electrical steel
In reluctance and permanent magnet synchronous machines, flux barriers are crucial for magnetic flux guidance. Designed as cutouts, flux barriers reduce the mechanical strength of the rotor construction. [...]
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2020-03-13
12:56
OpenAccess [FZJ-2020-01376] Preprint
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Fuel Cell Electrode Characterization Using Neutron Scattering
Electrochemical energy conversion and storage is key for the use of regenerative energies at large scale. A thorough understanding of the individual components, such as the ion conducting membrane and the electrode layers, can be obtained with scattering techniques on atomit to molecular length scales. [...]
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2019-02-25
11:02
[IMPULSE-2019-00107] Preprint
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Reciprocal space mapping of the magnetic order in epitaxial MnSi thin films
We report grazing incidence small angle neutron scattering (GISANS) and complementary off-specular neutron reflectometry (OSR) of the magnetic order in a single-crystalline epitaxial MnSi film on Si(111) in the thick film limit. Providing a means of direct reciprocal space mapping, GISANS and OSR reveal a magnetic modulation perpendicular to the films under magnetic fields parallel and perpendicular to the film, where additional polarized neutron reflectometry (PNR) and magnetization measurements are in excellent agreement with the literature [...]
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2019-01-22
16:03
arXiv [IMPULSE-2019-00057] Preprint
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Interplay of Itinerant and Localized Spin Fluctuations in the Ferromagnetic Superconductor UGe$_2$
Microscopic coexistence of ferromagnetism and unconventional superconductivity renders UGe$_2$ a candidate for spin-triplet superconductivity. To avoid pair-breaking, spin-triplet superconductivity is mediated by longitudinal spin fluctuations promoted by magnetic Ising anisotropy. [...]

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2018-04-28
12:37

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2018-04-11
14:50
arXiv [IMPULSE-2018-00179] Preprint
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Tunable viscosity modification with diluted particles: When particles decrease the viscosity of complex fluids
While spherical particles are the most studied viscosity modifiers, they are well known only to increase viscosities, in particular at low concentrations. Extended studies and theories on non-spherical particles find a more complicated behavior, but still a steady increase. [...]
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2018-04-11
12:04
arXiv [IMPULSE-2018-00168] Preprint
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Liquid-liquid transition revealed by quasi-static cooling of an ultra-viscous metallic liquid
Temperature-driven polyamorphism has been reported in various supercooled liquids and glasses. The dynamical and structural routes followed by the system during such crossovers are however not universal and appear to be related to intrinsic kinetic properties of the liquid. [...]
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2018-04-11
10:57
arXiv [IMPULSE-2018-00163] Preprint
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Origin of Ferroelectricity in Orthorhombic $LuFeO_3$
In this Letter, we demonstrate that a small but finite ferroelectric polarization in orthorhombic LuFeO$_3$ is primarily of electronic origin (oriented along a-axis) driven by commensurate (k = 0) and collinear magnetic structure. The nonpolar orthorhombic lattice (space group $Pnma$) undergoes isostructural transition at the magnetic transition temperature $T_N$ ($\sim$600 K). [...]
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2018-04-11
10:51
arXiv [IMPULSE-2018-00161] Preprint
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In-situ observation of temperature-dependent segregation of Ni adatoms on oriented Pd surfaces
We report the direct observation of the in-situ temperature-dependent surface segregation of Ni adatoms on single crystalline Pd surfaces using Positron annihilation induced Auger Electron Spectroscopy (PAES). For this study, a single atomic layer of Ni was grown on Pd with the crystallographic orientations Pd(111), Pd(110) and Pd(100). [...]
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