A5008998898- Nuclear Physics and Applications
- Magnetic properties of thin films
- Atomic and Subatomic Physics Research
- Magnetic and transport properties of perovskites and related materials
- Metallic Glasses and Amorphous Alloys
- Fusion materials and technologies
- Theoretical and Computational Physics
- Advanced Condensed Matter Physics
- Superconducting Materials and Applications
- Silicon Nanostructures and Photoluminescence
- Chalcogenide Semiconductor Thin Films
- Aluminum Alloy Microstructure Properties
- Metallurgical Processes and Thermodynamics
- 2D Materials and Applications
- Diamond and Carbon-based Materials Research
- Semiconductor Quantum Structures and Devices
- Additive Manufacturing Materials and Processes
- Semiconductor materials and interfaces
- Magnetic Properties and Applications
- Rare-earth and actinide compounds
- Magnetic Properties of Alloys
- High-pressure geophysics and materials
- Analytical chemistry methods development
- Advanced Materials Characterization Techniques
- Laser-induced spectroscopy and plasma
University of Iceland
2019-2024
Aarhus University
2019
The utilization of polarized neutrons is great importance in scientific disciplines spanning materials science, physics, biology, and chemistry. However, state-of-the-art multilayer polarizing neutron optics have limitations, particularly low specular reflectivity polarization at higher scattering vectors/angles, the requirement high external magnetic fields to saturate polarizer magnetization. Here, we show that, by incorporating
This study explores the impact of boron carbide (B4C) addition on magnetic domains within Fe/Si multilayers through off-specular neutron scattering with polarization analysis. The incorporation B4C induces amorphization in layers, disrupting domain structures. Analysis patterns reveals that pure exhibit no significant correlation between resulting a specific diffuse signal, while incorporated revealed scattering. We offer qualitative interpretation these phenomena and accurately model...
The intentional formation of defects in transition-metal dichalcogenides, such as MoS2, is an attractive way to modify the electronic and chemical properties this class 2D materials. However, mechanisms methods available for selective doping or modification basal plane must be improved. Here we investigate process O defect epitaxial single-layer MoS2 on Au(1 1 1) using scanning tunneling microscopy (STM) ambient pressure x-ray photoelectron spectroscopy (AP-XPS) during oxidation with O2 H2O...
We study the magnetic coupling in a thin film bilayer exchange-spring magnet composed of an amorphous ${\mathrm{Tb}}_{10}{\mathrm{Co}}_{90}$ layer with large perpendicular anisotropy and ${\mathrm{Co}}_{85}{({\mathrm{Al}}_{70}{\mathrm{Zr}}_{30})}_{15}$ uniaxial in-plane anisotropy. The CoAlZr is directly exchange coupled to TbCo interface region at least 7.5 nm within which magnetization plane switches underlying TbCo. influence extends up 30 into resulting effective tilted coercivity...
Amorphous metals have unusual magnetic properties that arise due to the disordered atomic arrangement. We show Cox(Al70Zr30)100−x (65 < x 92 at. %) amorphous alloys a distribution in local coupling and ordering temperature, which can be explained by nanoscale composition variations. use competing anisotropies induced substrate an applied field during growth probe Co concentration distribution. Only regions with high enough develop anisotropy along growth, whereas of low dictated...
Liquid aluminum containing the important alloying element magnesium in varying concentrations was analyzed using in-situ laser-induced breakdown spectroscopy (LIBS). Magnesium emission shows an exponential dependence on melt temperature that correlates well with expected partial pressure of above melt. Furthermore, comparison LIBS measurements corresponding solid samples supports conclusion a significant part Mg from liquid metal originates vapor phase surface. Simultaneously, curves growth...
Here we study the magnetic proximity effect in amorphous layered magnets of alternating high- and low-${T}_{\text{c}}$ materials using magnetometry polarized neutron reflectivity. By altering thickness either or layer are able to extract induced moment directly how it scales with thickness. We observe that ordering temperature is enhanced above which a second magnetically ordered state very large extension observed. This survives at least three times magnetization approximately constant...
We study the magnetic properties of amorphous TbxCo100-xfilms withxin range 8-12 at% and with a thickness 5-100 nm. In this are shaped by competition between perpendicular bulk anisotropy an in-plane interface anisotropy, in addition to changes magnetization. This results temperature controllable spin reorientation transition from out-of-plane which is composition dependent. Furthermore, we show that recovered throughout entire TbCo/CoAlZr multilayer, where neither TbCo nor CoAlZr single...
The concept of scattering length density tuning for improved polarization is investigated Fe/<a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:mmultiscripts><a:mi mathvariant="normal">B</a:mi><a:mn>4</a:mn><a:none/><a:mprescripts/><a:none/><a:mn>11</a:mn></a:mmultiscripts><a:mi>CTi</a:mi></a:mrow></a:math> multilayers and compared to the commonly used Fe/Si system in polarizing multilayer neutron optics. X-ray reflectivity, magnetization, were measured on such multilayers,...
The concept of scattering length density tuning for improved polarization is investigated Fe/11B4CTi multilayers and compared to the commonly used Fe/Si system in polarizing multilayer neutron optics. X-ray reflectivity, magnetization, have been measured on such multilayers, highlighting differences from conventional systems are deposited with 25 Å period thickness 20 repetitions using ion-assisted DC magnetron sputtering. Replacing Si 11B4CTi shows a more than 200% increase reflectivity due...
The concept of scattering length density tuning for improved polarization is investigated Fe/11B4CTi multilayers and compared to the commonly used Fe/Si system in polarizing multilayer neutron optics. X-ray reflectivity, magnetization, have been measured on such multilayers, highlighting differences from conventional multilayers. systems were deposited with 25 {\AA} period thickness, a layer thickness ratio 0.35 20 periods, using ion-assisted DC magnetron sputtering. Replacing Si 11B4CTi...
Abstract We study the dependence of photo-spectral intensity on tri- and multilayers SiO 2 /[SiGe [ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:msub> <mml:mi>d</mml:mi> <mml:mi>SiGe</mml:mi> </mml:mrow> </mml:msub> </mml:math> ]/SiO ] N with repetitions = 1 to 10 thicknesses <mml:mo>=</mml:mo> <mml:mn>5</mml:mn> –100 nm. Photocurrent analysis reveals a bimodal spectral feature. A comparison photocurrent between shows that in multilayer...
We present a study of the effect annealing amorphous ferromagnetic thin films <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\text{Co}_{0.85}(\mathrm{A}1_{0.7}\text{Zr}_{0.3})_{0.15}$</tex> , post deposition. The was done in vacuum with no applied magnetic field. find that already at relatively low temperature 130 xmlns:xlink="http://www.w3.org/1999/xlink">$^{\circ} \mathrm{C}$</tex> there is crystallite formation introduces both structural...
The utilization of polarized neutrons is great importance in scientific disciplines spanning materials science, physics, biology, and chemistry. Polarization analysis offers insights into otherwise unattainable sample information such as magnetic domains structures, protein crystallography, composition, orientation, ion-diffusion mechanisms, relative location molecules multicomponent biological systems. State-of-the-art multilayer polarizing neutron optics have limitations, particularly low...