A5029155217- Magnetic properties of thin films
- Metal and Thin Film Mechanics
- Semiconductor materials and devices
- MXene and MAX Phase Materials
- Magnetic and transport properties of perovskites and related materials
- Metallic Glasses and Amorphous Alloys
- 2D Materials and Applications
- Magnetic Properties of Alloys
- Copper Interconnects and Reliability
- Ferroelectric and Negative Capacitance Devices
- ZnO doping and properties
- Magnetic Properties and Applications
- Nuclear Physics and Applications
- Quantum and electron transport phenomena
- Advanced Condensed Matter Physics
- Fuel Cells and Related Materials
- Atomic and Subatomic Physics Research
- Physics of Superconductivity and Magnetism
- Plasma Diagnostics and Applications
- GaN-based semiconductor devices and materials
- Electrocatalysts for Energy Conversion
- Diamond and Carbon-based Materials Research
- Theoretical and Computational Physics
- Semiconductor Quantum Structures and Devices
- High-Temperature Coating Behaviors
University of Iceland
2015-2025
Institute for Energy Technology
2020
Uppsala University
2012-2019
University of Warwick
2013
AGH University of Krakow
2013
Imperial College London
2005-2009
University of Sussex
2005
Abstract Low-dimensional magnetic heterostructures are a key element of spintronics, where interactions between different materials often define the functionality devices. Although some interlayer exchange coupling mechanisms by now well established, possibility direct via proximity-induced magnetization through non-magnetic layers is typically ignored due to presumed short range such proximity effects. Here we show that order can be induced throughout 40-nm-thick amorphous paramagnetic...
The first experimental realization of a magnetic ${M}_{n+1}A{X}_{n}$ (MAX) phase, $({\mathrm{Cr}}_{0.75}{\mathrm{Mn}}_{0.25}{)}_{2}\mathrm{GeC}$, is presented, synthesized as heteroepitaxial single crystal thin film, exhibiting excellent structural quality. This self-organized atomic laminate based on the well-known ${\mathrm{Cr}}_{2}\mathrm{GeC}$, with Mn, new element in MAX phase research, substituting Cr. compound was predicted using first-principles calculations, from which variety...
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Abstract (Cr 1– x Mn ) 2 AlC MAX phase thin films were synthesized by cathodic arc deposition. Scanning transmission electron microscopy including local energy dispersive X‐ray spectroscopy analysis of the as‐deposited reveals a incorporation as much 10 at% in structure, corresponding to = 0.2. Magnetic properties characterized with vibrating sample magnetometry, revealing magnetic response up at least room temperature. We thus verify previous theoretical predictions an antiferromagnetic or...
This article reports the morphology and corrosion study of CoCrNiFeMo CoCrNiFeMoCu high-entropy alloys (HEA) tested in a simulated superheated geothermal environment to evaluate whether are candidate materials for corrosive high-temperature environment. The HEA with different alloying ratios were steam at 350 °C 10 bar gauge containing HCl, H2S, CO2 acidic condensate (pH = 3). Cu prone damage rate was accelerated by intermetallic rich sites but not test
Inherently layered magnetic materials, such as ${M}_{n+1}A{X}_{n}$ (MAX) phases, offer an intriguing perspective for use in spintronics applications and ideal model systems fundamental studies of complex phenomena. The MAX phase composition ${{M}_{n}}_{+1}A{X}_{n}$ consists ${M}_{n+1}{X}_{n}$ blocks separated by atomically thin $A$-layers where $M$ is a transition metal, $A$ A-group element, $X$ refers to carbon and/or nitrogen, $n$ typically 1, 2, or 3. Here, we show that the recently...
In 2013, a new class of inherently nanolaminated magnetic materials, the so called MAX phases, was discovered. Following predictive material stability calculations, hexagonal Mn2GaC compound synthesized as hetero-epitaxial films containing Mn exclusive M-element. Recent theoretical and experimental studies suggested high ordering temperature non-collinear antiferromagnetic (AFM) spin states result competitive ferromagnetic exchange interactions. order to assess potential for practical...
The discharge current and voltage waveforms have been measured in a reactive high power impulse magnetron sputtering (HiPIMS) Ar/N2 with Ti target for 400 μs long pulses. We observe that the waveform HiPIMS is highly dependent on pulse repetition frequency, unlike non-reactive Ar discharge. found to increase significantly as frequency lowered. This attributed an secondary electron emission yield during self-sputtering phase, when nitride forms at low frequencies. In addition, runaway occurs...
We present synthesis and characterization of a new magnetic atomic laminate: (Mo0.5Mn0.5)2GaC. High quality crystalline films were synthesized on MgO(111) substrates at temperature ∼530 °C. The display response, evaluated by vibrating sample magnetometry, in range 3-300 K field up to 5 T. response ranges from ferromagnetic paramagnetic with change temperature, an acquired 5T-moment remanent moment 3 0.66 0.35 μB per metal atom (Mo Mn), respectively. the coercive (0.06 T) exceed all values...
Electrostatic probes or Langmuir are the most common diagnostic tools in plasma discharges. The second derivative of probe I-V characteristic is proportional to electron energy distribution function. Determining accurately requires some method noise suppression. We compare Savitzky–Golay filter, Gaussian and polynomial fitting Blackman filter for digitally smoothing simulated measured characteristics. find that achieves with minimal distortion noisy data.
The discharge current–voltage–time waveforms are studied in the reactive Ar/O2 high power impulse magnetron sputtering with a titanium target for 400 μs long pulses. current waveform is highly dependent on both pulse repetition frequency and voltage increases decreasing or voltage. authors attribute this to an increase secondary electron emission yield during self-sputtering phase of pulse, as oxide forms target.
SmCo thin films have been grown by magnetron sputtering at room temperature with a composition of 2–35 at. % Sm. Films 5 or higher Sm are amorphous and smooth. A giant tunable uniaxial in-plane magnetic anisotropy is induced in the which peaks range 11–22 This cross-over behavior not due to changes atomic moments but rather local configuration changes. The excellent layer perfection combined highly properties make these important for spintronics applications.
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
The magnetic properties of amorphous thin films are shaped by inherent composition variations and proximity effects. Their can be tuned precisely with over a continuous range their high resistance reduces shunting in spintronic systems. We examine the static dynamic Cox(Al0.7Zr0.3)1−x $$0.60\le x<0.87$$ , without purposely modulated composition. Gilbert damping is very low but increases dramatically decreasing Co content. Damping also studied CoAlZr multilayer alternating intrinsically...
TiN films have been grown on <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$\hbox{SiO}_{2}$</tex></formula> by reactive high-power impulse magnetron sputtering (HiPIMS) at temperatures of 22 Notation="TeX">$^{\circ} \hbox{C}$</tex></formula> –600 Notation="TeX">$^{\circ}\hbox{C}$</tex></formula> . The film resistance is monitored in situ to determine the coalescence and continuity thicknesses that...
The phase stability of Mo n +1 GaC has been investigated using ab‐initio calculations. results indicate for the 2 only, with a formation enthalpy –0.4 meV per atom. Subsequent thin film synthesis was performed through magnetron sputtering from elemental targets onto Al O 3 [0001], 6H‐SiC [0001] and MgO [111] substrates within temperature range 500 °C 750 °C. High structural quality films were obtained on at 590 ºC. Evaluation transport properties showed superconducting behavior critical...
In this work, a CoCrFeNiMo high-entropy alloy (HEA) material was prepared by the vacuum arc melting (VAM) method and used for electro-spark deposition (ESD). The purpose of study to investigate phase evolution microstructure HEA as as-cast electro-spark-deposited (ESD) coating assess its suitability corrosvie environments encountered in geothermal energy production. composition, morphology, structure bulk were analyzed using scanning electron microscopy (SEM) coupled with energy-dispersive...