A5024913810- Magnetic Properties of Alloys
- Magnetic properties of thin films
- High-Temperature Coating Behaviors
- Magnetic and transport properties of perovskites and related materials
- High Entropy Alloys Studies
- Rare-earth and actinide compounds
- Metallic Glasses and Amorphous Alloys
- Advanced materials and composites
- Geomagnetism and Paleomagnetism Studies
- Chalcogenide Semiconductor Thin Films
- Nonlinear Optical Materials Studies
- Shape Memory Alloy Transformations
- Diamond and Carbon-based Materials Research
- Laser-Ablation Synthesis of Nanoparticles
- Zeolite Catalysis and Synthesis
- Heusler alloys: electronic and magnetic properties
- X-ray Diffraction in Crystallography
- Characterization and Applications of Magnetic Nanoparticles
- Magnetic Properties and Applications
- Metal-Organic Frameworks: Synthesis and Applications
- Intermetallics and Advanced Alloy Properties
- X-ray Spectroscopy and Fluorescence Analysis
University of Duisburg-Essen
2020-2025
European Synchrotron Radiation Facility
2022
Unraveling the mechanism behind bulk perpendicular magnetic anisotropy (PMA) in amorphous rare earth-transition metal films has proven challenging. This is largely due to inherent complexity of structure and entangled potential origins arising from microstructure atomic factors. Here, we present an approach wherein magneto-electric effect harnessed induce 90° switching PMA Tb–Co in-plane directions by applying voltages only −1.2 V. manipulation achieved voltage-driven insertion hydrogen...
High entropy oxides (HEOs) are single-phase solid solutions consisting of 5 or more cations in approximately equiatomic proportions. In this study, we show the reversible control optical properties a rare-earth (RE) based HEO-(Ce0.2La0.2Pr0.2Sm0.2Y0.2)O2−δ and subsequently utilize combination spectroscopic techniques to derive features electronic band structure underpinning observed phenomena. Heat treatment HEO under vacuum atmosphere followed by reheat air results change bandgap energy,...
Abstract High entropy alloys (HEAs) have a wide range of applications across various fields, including structural engineering, biomedical science, catalysis, magnetism, and nuclear technology. Nanoscale HEA particles show promising catalytic properties. Nevertheless, attaining versatile composition control in nanoparticles poses persistent challenge. This study proposes the use pulsed laser ablation liquids (PLAL) for synthesizing using equiatomic CoCrFeMnNi targets with varied preparation...
The transition toward a carbon-neutral society based on renewable energies goes hand in with the availability of energy-efficient technologies. Magnetocaloric cooling is very promising refrigeration technology to fulfill this role regarding cryogenic gas liquefaction. However, current reliance highly resource critical, heavy rare-earth-based compounds as magnetocaloric material makes global usage unsustainable. Here, we aim mitigate limitation through utilization multicaloric concept, which...
We present a novel instrument designed for advanced magnetic study, installed at the ID12 beamline of European Synchrotron Radiation Facility in Grenoble, France. This offers unique capability to simultaneously measure element-specific microscopic and macroscopic properties related magnetic, electronic structural characteristics materials. In addition X-ray absorption, circular dichroism alongside diffraction patterns, magnetization, volume changes, caloric electrical resistivity materials...
Changes of the magnetic and crystal structure on microscopic scale in 40 nm FeRh thin films have been applied to investigate phenomena a disorder induced ferromagnetism at room temperature initiated through light ion-irradiation with fluences up 0.125 Ne$^+$/nm$^{-2}$. Magnetometry shows an increase ordering low temperatures decrease transition combined broadening hysteresis rising ion fluence. $^{57}$Fe M\"ossbauer spectroscopy reveals occurrence additional contributions hyperfine splitting...
We have performed a combined experimental and theoretical investigation of the vibrational properties ${\mathrm{Ni}}_{2}\mathrm{Mn}\mathrm{Sn}$ Heusler alloys. Sn-partial density states (VDOS) $^{119}\mathrm{Sn}$ was measured by nuclear resonant inelastic x-ray scattering at temperatures 15 300 K, while magnetism local environment Sn resolved M\"ossbauer spectroscopy. Using functional theory, we associate peaks in VDOS with particular features element-resolved phonon dispersion...
Utilizing the molecular beam epitaxy technique, a nanoscale thin-film magnet of c-axis-oriented Sm2Co17 and SmCo5 phases is stabilized. While typically in prototype Sm(Co, Fe, Cu, Zr)7.5–8 pinning-type magnets, an ordered nanocomposite formed by complex thermal treatments, here, one-step approach to induce controlled phase separation binary Sm–Co system shown. A detailed analysis extended X-ray absorption fine structure confirmed coexistence with 65% 35% SmCo5. The stabilized directly on...
Abstract Nanoscaled magnetic particle ensembles are promising building blocks for realizing magnon based binary logic. Element-specific real-space monitoring of resonance modes with sampling rates in the GHz regime is imperative experimental verification future complex magnonic devices. Here we present observation different phasic using element-specific technique time-resolved scanning transmission x-ray microscopy within a chain dipolarly coupled Fe 3 O 4 nanoparticles (40–50 nm size)...
Magnetic cooling has the potential to replace conventional gas compression refrigeration. Materials such as La(Fe,Si)$_{13}$ exhibit a sizeable first-order magnetocaloric effect, and it is possible tailor phase transition towards room temperature by Mn-H-doping, resulting in large range for operation. Within this work, we discuss variations of electronic lattice structure with increasing Mn content utilizing X-ray magnetic circular dichroism (XMCD) extended absorption fine spectroscopy...
The adsorption of carbon dioxide (CO2) in porous materials is great importance to address current environmental issues. We propose an approach where high-resolution powder X-ray diffraction and isotherm modeling are combined unravel the process CO2 zeolite silicalite. Four main positions molecules locate silicalite identified, two straight channels sinusoidal channels, which imposes a maximum capacity 16 per unit cell (2.77 mmol·g–1) at 21 bar. resulting global successfully fitted with Toth...
Unraveling the mechanisms responsible for perpendicular magnetic anisotropy (PMA) in amorphous rare earth-transition metal alloys has proven challenging, primarily due to intrinsic complexity of structure. Here, we investigated atomic origin PMA by applying an approach voltage-driven hydrogen insertion interstitial sites, which serve as a perturbation and probe local After charging, TbCo thin films diminished switched in-plane anisotropy, accompanied distinct domain structures. By analyzing...
High entropy oxides (HEOs) are a rapidly emerging class of functional materials consisting multiple principal cations. The original paradigm HEOs assumes cationic occupations with the highest possible configurational allowed by composition and crystallographic structure. However, fundamental question remains on actual degree disorder in HEOs, especially, systems low enthalpy barriers for cation anti-site mixing. Considering experimental limitations due to presence cations here we utilize...