Physics (Scholarly Publications): Recent submissions
Now showing items 141-160 of 1742
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Stability of Mn2RuxGa-based multilayer stacks
(2022)Perpendicular heterostructures based on a ferrimagnetic Mn2RuxGa (MRG) layer and a ferromagnetic Co/Pt multilayer were examined to understand the effects of different spacer layers (V, Mo, Hf, HfOx and TiN) on the interfaces ... -
Single pulse all-optical toggle switching of magnetization without gadolinium in the ferrimagnet Mn2RuxGa
(2020)Energy-efficient control of magnetization without the help of a magnetic field is a key goal of spintronics. Purely heat-induced single-pulse all-optical toggle switching has been demonstrated, but so far only in Gd-based ... -
Spin polarization and magnetotransport properties of systematically disordered Fe60Al40 thin films
(2021)We investigate the evolution of spin polarization, spontaneous Hall angle (SHA), saturation magnetization, and Curie temperature of B2-ordered Fe 60 Al 40 thin films under varying antisite disorder, induced by ... -
Exchange-driven all-optical magnetic switching in compensated 3d ferrimagnets
(2020)Understanding how a single laser pulse can toggle magnetization in a compensated 3d ferrimagnet is a critical problem in ultrafast magnetism. To resolve it, we test single-shot all-optical switching of magnetization in Mn ... -
CALPHAD-assisted development of in-situ nanocrystallised melt-spun Co-Fe-B alloy with high Bs (1.57 T)
(2021)A thermodynamics-based approach, Calculation of Phase Diagram (CALPHAD), combined with topological instability parameters are proposed and experimentally evaluated, in order to optimise in-situ nanocrystallisation of rapidly ... -
Hilbert-space fragmentation, multifractality, and many-body localization
(2021)Investigating many-body localization (MBL) using exact numerical methods is limited by the exponential growth of the Hilbert space. However, localized eigenstates display multifractality and only extend over a vanishing ... -
Atomistic simulations of surface reactions in ultra-high-temperature ceramics: O2, H2O and CO adsorption and dissociation on ZrB2 (0001) surfaces
(2021)Understanding surface reactivity is crucial in many fields, going from heterogeneous catalysis to materials oxidation and corrosion. In order to better decipher the initial stage of surface reactions of ZrB2 exposed to ... -
Effect of a ferromagnetic STM cobalt tip on a single Co-phthalocyanine molecule adsorbed on a ferromagnetic substrate
(2021)The effect of a ferromagnetic scanning tunneling microscope (STM) cobalt tip on the electronic, magnetic and electronic transport properties of a Co-phthalocyanine (CoPc)/Co(111) junction has been investigated in the ... -
The nanoscale structure of the Pt-water double layer under bias revealed
(2021)Atomistic mass and charge distribution at electrified interfaces play a key role in electrochemical phenomena of huge technological relevance for energy production and conversion. However, in spite of its importance, the ... -
Complex band structure with non-orthogonal basis set: analytical properties and implementation in the SIESTA code
(2022)The complex band structure (CBS), although not directly observable, determines many properties of a material where the periodicity is broken, such at surfaces, interfaces and defects. Furthermore, its knowledge helps in ... -
Data-driven enhancement of cubic phase stability in mixed-cation perovskites
(2021)Mixing cations has been a successful strategy in perovskite synthesis by solution-processing, delivering improvements in the thermodynamic stability as well as in the lattice parameter control. Unfortunately, the relation ... -
Measuring Dynamic Structural Changes of Nanoparticles at the Atomic Scale Using Scanning Transmission Electron Microscopy
(2020)We propose a new method to measure atomic scale dynamics of nanoparticles from experimental high-resolution annular dark field scanning transmission electron microscopy images. By using the so-called hidden Markov model, ... -
Procedure for 3D atomic resolution reconstructions using atom-counting and a Bayesian genetic algorithm
(2021)We introduce a Bayesian genetic algorithm for reconstructing atomic models of nanoparticles from a single projection using Z-contrast imaging. The number of atoms in a projected atomic column obtained from annular dark ... -
Increasing Spatial Fidelity and SNR of 4D-STEM using Multi-frame Data Fusion
(2021)4D-STEM, in which the 2D diffraction plane is captured for each 2D scan position in the scanning transmission electron microscope (STEM) using a pixelated detector, is complementing, and increasingly replacing existing ... -
Development of a Practicable Digital Pulse Read-Out for Dark-Field STEM
(2021)When characterising beam-sensitive materials in the scanning transmission electron microscope (STEM), low- dose techniques are essential for the reliable observation of samples in their true state. A simple route to minimise ... -
Unlocking the Origin of Compositional Fluctuations in InGaN Light Emitting Diodes
(2021)The accurate determination of compositional fluctuations is pivotal in understanding their role in the reduction of efficiency in high indium content InxGa1–xN light emitting diodes (LEDs), the origin of which is still ... -
Towards data-driven next-generation transmission electron microscopy
(2020)Electron microscopy touches on nearly every aspect of modern life, underpinning materials development for quantum computing, energy and medicine. We discuss the open, highly integrated and data-driven microscopy architecture ... -
Using Your Beam Efficiently: Reducing Electron Dose in the STEM via Flyback Compensation
(2022)In the scanning transmission electron microscope, fast-scanning and frame-averaging are two widely used approaches for reducing electron-beam damage and increasing image signal noise ratio which require no additional ... -
Cost & Capability Compromises in STEM Instrumentation for Low-Voltage Imaging
(2022)When characterising beam-sensitive materials in the scanning transmission electron microscope (STEM), low- dose techniques are essential for the reliable observation of samples in their true state. A simple route to minimise ... -
Description of the buckling of a chain of hard spheres in terms of Jacobi functions
(2022)A linear chain of hard spheres, confined by a transverse harmonic potential, buckles under compression between two hard walls. Jacobi functions provide exact analytic solutions of a differential equation (related to the ...
