P. Böni
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View article: Observation of a Giant Goos-Hänchen Shift for Matter Waves
Observation of a Giant Goos-Hänchen Shift for Matter Waves Open
The Goos-Hänchen (GH) shift describes a phenomenon in which a specularly reflected beam is translated along the reflecting surface such that the incident and reflected rays no longer intersect at the surface. Using a neutron spin-echo tech…
View article: Spin-orbital correlations from complex orbital order in MgV$_{2}$O$_{4}$
Spin-orbital correlations from complex orbital order in MgV$_{2}$O$_{4}$ Open
MgV$_{2}$O$_{4}$ is a spinel based on magnetic V$^{3+}$ ions which host both spin ($S=1$) and orbital ($l_{eff}=1$) moments. Owing to the underlying pyrochlore coordination of the magnetic sites, the spins in MgV$_{2}$O$_{4}$ only antiferr…
View article: Temperature-driven transition into vortex clusters in low-kappa intertype superconductors
Temperature-driven transition into vortex clusters in low-kappa intertype superconductors Open
In the vicinity of the type-I/type-II crossover in conventional superconductors, vortices exhibit a nonmonotonic interaction, which leads to exotic vortex matter states. We perform molecular dynamics simulations on a model superconductor i…
View article: Evolution of the spin dynamics during freezing in the spin-glass Fe$_{x}$Cr$_{1-x}$
Evolution of the spin dynamics during freezing in the spin-glass Fe$_{x}$Cr$_{1-x}$ Open
In the iron--chromium system, Fe$_{x}$Cr$_{1-x}$, a wide dome of spin-glass behavior emerges when the ferromagnetism of iron is suppressed and the antiferromagnetism of chromium emerges as a function of increasing iron content $x$. As both…
View article: Transmission Bender as an Analyzer Device for MIEZE
Transmission Bender as an Analyzer Device for MIEZE Open
MIEZE (Modulation of IntEnsity with Zero Effort) spectroscopy is a high-resolution spin echo technique optimized for the study of magnetic samples and samples under depolarizing conditions. It requires a polarization analyzer in between sp…
View article: Topological magnon band structure of emergent Landau levels in a skyrmion lattice
Topological magnon band structure of emergent Landau levels in a skyrmion lattice Open
The motion of a spin excitation across topologically nontrivial magnetic order exhibits a deflection that is analogous to the effect of the Lorentz force on an electrically charged particle in an orbital magnetic field. We used polarized i…
View article: Nested mirror optics for neutron extraction, transport, and focusing
Nested mirror optics for neutron extraction, transport, and focusing Open
Neutron scattering is a well-established tool for the investigation of the static and dynamic properties of condensed matter systems over a wide range of spatial and temporal scales. Many studies of high interest, however, can only be perf…
View article: A Design Study of a Compact Small-Angle Neutron Scattering Instrument
A Design Study of a Compact Small-Angle Neutron Scattering Instrument Open
Nanoscale structure determination belongs to one of the crucial tasks in materials science. Small-angle neutron scattering (SANS) is a highly valuable tool to investigate nanostructures. Here, we explore the possibility of a compact SANS i…
View article: Data and Skripts for Transmisson bender as an analyser device for MIEZE
Data and Skripts for Transmisson bender as an analyser device for MIEZE Open
- MIEZE data (Detector image files): 00152360.pad (6AA); 00152362.pad (5AA); 00152363.pad (5.5AA); 00152364.pad (4.5AA); 00152365.pad (5.7AA); 00152366.pad (5.8AA); 00152367.pad (5.9AA); 00152382.pad (6.0AA, + collimator); Bender_b16on_db …
View article: Data supplement for "Topological magnon band structure of emergent Landau levels in a skyrmion lattice"
Data supplement for "Topological magnon band structure of emergent Landau levels in a skyrmion lattice" Open
Collection of the data sets for our paper, Topological magnon band structure of emergent Landau levels in a skyrmion lattice. (The source code supplement can be found here.) Contents Data files used for the paper's figures. Scan Figure Fil…
View article: Data supplement for "Topological magnon band structure of emergent Landau levels in a skyrmion lattice"
Data supplement for "Topological magnon band structure of emergent Landau levels in a skyrmion lattice" Open
Collection of the data sets for our paper, Topological magnon band structure of emergent Landau levels in a skyrmion lattice. (The source code supplement can be found here.) Contents Data files used for the paper's figures. Scan Figure Fil…
View article: Fermi Surface Modeling of Light‐Rare‐Earth Hexaborides using Positron Annihilation Spectroscopy
Fermi Surface Modeling of Light‐Rare‐Earth Hexaborides using Positron Annihilation Spectroscopy Open
2D angular correlation of the positron annihilation radiation (2D‐ACAR) spectra are measured for along high‐symmetry directions and compared with first‐principles calculations based on density functional theory (DFT). This allows the model…
View article: Reflectometry with Polarized Neutrons on In Situ Grown Thin Films
Reflectometry with Polarized Neutrons on In Situ Grown Thin Films Open
Originating from the demand for obtaining depth‐resolved magnetization profiles from thin films and heterostructures, polarized neutron reflectometry (PNR) has developed into a unique research tool, which also finds application in the anal…
View article: Fermi-Surface Modeling of Light-Rare-Earth Hexaborides with 2D-ACAR Spectroscopy
Fermi-Surface Modeling of Light-Rare-Earth Hexaborides with 2D-ACAR Spectroscopy Open
Two dimensional angular correlation of the positron annihilation radiation (2D-ACAR) spectra are measured for $\mathrm{LaB}_6$ along high symmetry directions and compared with first principle calculations based on density functional theory…
View article: Self-shielding copper substrate neutron supermirror guides
Self-shielding copper substrate neutron supermirror guides Open
The invention of self-shielding copper substrate neutron guides is described, along with the rationale behind the development, and the realisation of commercial supply. The relative advantages with respect to existing technologies are quan…
View article: Indications for Dzyaloshinskii-Moriya interaction at the Pd/Fe interface studied by <i>in situ</i> polarized neutron reflectometry
Indications for Dzyaloshinskii-Moriya interaction at the Pd/Fe interface studied by <i>in situ</i> polarized neutron reflectometry Open
Using \\textit{in situ} polarized neutron reflectometry, the depth resolved\nevolution of the magnetism and structure in a Pd/Fe/Pd trilayer thin-film is\nmeasured during growth. The initial film structure of Pd/Fe shows a small\nproximity…
View article: Origin of Pseudo-Variation in High Resolution Neutron Grating Interferometry
Origin of Pseudo-Variation in High Resolution Neutron Grating Interferometry Open
Origin of Pseudo-Variation in High Resolution Neutron Grating Interferometry Tobias Neuwirth, Michael Schulz, Peter Böni Abstract. During neutron grating interferometry measurements with a highly collimated neutron beam a pseudo-variation …
View article: Polarized inelastic neutron scattering of nonreciprocal spin waves in MnSi
Polarized inelastic neutron scattering of nonreciprocal spin waves in MnSi Open
We report spin-polarized inelastic neutron scattering of the dynamical\nstructure factor of the conical magnetic helix in the cubic chiral magnet MnSi.\nWe find that the spectral weight of spin-flip scattering processes is\nconcentrated on…
View article: Universal behavior of the intermediate mixed state domain formation in superconducting niobium
Universal behavior of the intermediate mixed state domain formation in superconducting niobium Open
In the intermediate mixed state (IMS) of type-II/1 superconductors, vortex lattice (VL) and Meissner state domains coexist due to a partially attractive vortex interaction. Using a neutron-based multiscale approach combined with magnetizat…
View article: Search for pressure-induced tricriticality in Cr
Search for pressure-induced tricriticality in Cr Open
The antiferromagnetic ordering of chromium has long been known for its\npeculiar physical properties. One of them is the observation of the weak\nfirst-order character of the N'eel transition that is explained by the lack of\na stable fixe…
View article: Influence of Concentration Fluctuations on Relaxation Processes in Spin Glasses
Influence of Concentration Fluctuations on Relaxation Processes in Spin Glasses Open
Using the unique combination of atomically resolved atom probe tomography (APT) and volume averaged neutron (resonance) spin echo (NRSE and NSE) experiments, the influence of nano-scaled clusters on the spin relaxation in spin glasses was …
View article: Large Area HOPG Monochromators with Low Mosaic
Large Area HOPG Monochromators with Low Mosaic Open
Highly oriented pyrolytic graphite (HOPG) monochromators with low mosaic (grades PGCX04, PGCX05, ZYA, AGraphY, etc.) are only available up to a maximum size of 50 × 50 mm2. In particular for one-dimensional focusing, several monochromators…
View article: Influence of Concentration Fluctuations on Relaxation Processes in Spin Glasses
Influence of Concentration Fluctuations on Relaxation Processes in Spin Glasses Open
Using the unique combination of atomically resolved atom probe tomography (APT) and volume averaged neutron (resonance) spin echo (NRSE and NSE) experiments, the influence of nano-scaled clusters on the spin relaxation in spin glasses was …