A5053724807- Magnetic properties of thin films
- Theoretical and Computational Physics
- Advanced Chemical Physics Studies
- Magnetic Properties and Applications
- Hydrogen Storage and Materials
- Metallic Glasses and Amorphous Alloys
- Physics of Superconductivity and Magnetism
- Magnetic Properties of Alloys
- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Metal and Thin Film Mechanics
- Semiconductor materials and devices
- Fusion materials and technologies
- ZnO doping and properties
- Characterization and Applications of Magnetic Nanoparticles
- Quantum, superfluid, helium dynamics
- Advanced Electron Microscopy Techniques and Applications
- Quantum many-body systems
- nanoparticles nucleation surface interactions
- Electron and X-Ray Spectroscopy Techniques
- Surface and Thin Film Phenomena
- Nuclear Materials and Properties
- Nuclear Physics and Applications
- Copper Interconnects and Reliability
- X-ray Spectroscopy and Fluorescence Analysis
Uppsala University
2015-2024
Institute for Energy Technology
2020
Universidade Federal do Pará
2018
University of Warwick
2013
AGH University of Krakow
2013
Persian Gulf University
2009
KTH Royal Institute of Technology
1999-2002
Institute of Nuclear Physics of Lyon
1992-1994
Institut National de Physique Nucléaire et de Physique des Particules
1992-1994
Centre National de la Recherche Scientifique
1992-1994
Selective laser melting has been used to demonstrate the striking effect of scanning strategies on crystalline texture in 316L SS. The aligned crystal orientation along tensile direction (Z-axis) could be varied using strategy. A strong 〈100〉 single crystalline-like is obtained scan and a 〈110〉 was observed build when bidirectional without rotation. Fiber bi-directional vectors were rotated by 67° (Rot-scan) for each layer. study highlights correlation between with resulting textures,...
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...
Artificial spin ice arrays of micromagnetic islands are a means engineering additional energy scales and frustration into magnetic materials. Here we demonstrate phase transition in an artificial square use the symmetry lattice to verify presence excitations far below ordering temperature. We do this by measuring temperature-dependent magnetization different principal directions comparing it with simulations idealized statistical mechanical models. Our results confirm dynamical pre-melting...
Parameters for selective laser melting of Zr59.3Cu28.8Al10.4Nb1.5 (trade name AMZ4), allowing crack-free bulk metallic glass with low porosity, have been developed. The phase formation was found to be strongly influenced by the heating power laser. X-ray amorphous samples were obtained at and below 75 W. as-processed devitrify a two-stage crystallization process within which presence oxygen concluded play an essential role. At powers above W, observed crystallites cubic (Cu2Zr4O). hardness...
The interlayer ordering between ferromagnetic Fe layers in Fe/V (001) superlattices is switched from initially parallel to antiparallel, as well antiparallel parallel, upon introducing hydrogen the V layers. This process reversible removal of hydrogen. results unambiguously prove that major cause coupling transitions not hydrogen-induced changes thickness layers, but most likely distortion Fermi surface
We present a direct magnetic imaging study on the thermal macrospin ordering of artificial kagome spin ice building blocks. Using photoemission electron microscopy, employing x-ray circular dichroism, we are able to resolve single domain nature macrospins and determine states combined block structures. The nano-patterning material selection allows thermally activated magnetization reversal for occur. is dominated by ground state, consistent with state ordering. This work paves way...
A new neutron reflectometer SuperADAM has recently been built and commissioned at the Institut Laue-Langevin, Grenoble, France. It replaces previous ADAM. The instrument uses a solid state polarizer/wavelength filter providing highly polarized (up to 98.6%) monochromatic flux of 8 × 104 n cm−2 s−1 with monochromatization Δλ/λ = 0.7% angular divergence Δα 0.2 mrad. includes both single position sensitive detectors. detector allows simultaneous measurement specular reflection off-specular...
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...
We studied superconducting V layers deposited on an antiferromagnetically coupled [Fe(2)V(11)](20) superlattice. The parallel upper critical magnetic field exhibits anomalous T dependence up to the ferromagnetic saturation of superlattice, indicating that transition temperature T(S) decreases when rotating relative sublattice magnetization directions superlattice from antiparallel parallel. This proves pair breaking effect a Fe2 layer is reduced if at distance 1.5 nm second with spin...
One of the most challenging issues in characterization magnetic materials is to obtain a quantitative analysis on nanometer scale. Here we describe how electron circular dichroism (EMCD) measurements using transmission microscope can be used for that purpose, utilizing reciprocal space maps. Applying EMCD sum rules, an orbital spin moment ratio mL/mS=0.08+/-0.01 obtained Fe, which consistent with commonly accepted value. Hence, establish as element-specific technique studies, widely...
Mg-Ti alloys have uncommon optical and hydrogen absorbing properties, originating from a ``spinodal-like'' microstructure with small degree of chemical short-range order in the atomic distribution. In present study we artificially engineer by depositing Pd-capped Mg/Ti multilayers different periodicities. Notwithstanding large lattice mismatch between Mg Ti, as-deposited metallic show good structural coherence. On exposure to ${\text{H}}_{2}$ gas two-step hydrogenation process occurs Ti...
The influence of surface plasmons on the magneto-optic activity in a two-dimensional hexagonal array is addressed. experiments were performed using circular holes ferromagnetic Ni film. Well pronounced troughs are observed optical reflectivity, resulting from presence plasmons. found to strongly enhance response (Kerr rotation), as compared continuous film same composition. symmetry pattern coupling between plasmonic excitations demonstrated, diffraction measurements and theoretical...
We present a direct experimental investigation of the thermal ordering in an artificial analogue asymmetric two-dimensional Ising system composed rectangular array nano-fabricated magnetostatically interacting islands. During fabrication and below critical thickness magnetic material islands are thermally fluctuating thus is able to explore its phase space. Above freeze-in resulting arrested thermalized state for array. Determining we demonstrate genuine which can be analyzed context nearest...
We describe the hydrogen uptake during synthesis of alumina films from H2O present in high vacuum gas background. The concentration was determined by H1(N15,αγ)C12 nuclear resonance reaction. Furthermore, we show presence ions plasma stream time-of-flight mass spectrometry. content increased both film and stream, as oxygen partial pressure increased. On basis these measurements thermodynamic considerations, suggest that an aluminum oxide hydroxide compound is formed, on cathode surface well...
We describe the role of presence hydrogen on elastic properties AlxOyHz (0.32⩽x⩽0.4; 0.54⩽y⩽0.6; 3×10−4⩽z⩽0.14) films. The films were deposited by reactive magnetron sputtering in an Ar/O2/H2O discharge and studied Rutherford backscattering spectrometry, nuclear resonance analysis, selected area electron diffraction, as well nanoindentation. As concentration is increased from 0.03% to 13.9% measured modulus value reduced approximately 53%. excellent agreement with our electronic structure...
We have investigated the influence of biaxial compressive strain on thermodynamic properties hydrogen in thin, single-crystal vanadium layers (0.9, 1.6, and 2.0 nm). At H/V0.1 (atomic ratio), host-mediated H-H interaction was found to be attractive. For H/V>0.1, extremely weak 0.9-nm-thick layer repulsive 1.6- 2.0-nm-thick V layers. The increase with increasing thicknesses. These results are unexpected as is attractive both bulk thin under tensile for H/V0.5. Both strained unstrained...