Vlado K. Lazarov

Anisotropy-driven magnetic structures in manganese ferrite nanoparticle assemblies

Y. Ijiri, J. A. Borchers, Kathryn Krycka, A. Khelil et autres

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Progress in Spatially Resolved Magnon Spectroscopy in the STEM

Demie Kepaptsoglou, Florian Castioni, José Ángel Castellanos-Reyes, Jorge Luis Briseño Gómez et autres

Instrumentation advances for high-resolution electron-energy-loss spectroscopy (EELS) in the scanning transmission electron microscope (STEM) over the last decade have pushed the capabilities of analytical electron microscopy into the meV range [1]. Beyond vibrational spectroscopy, it was recently demonstrated that magnons, quasiparticles which …

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Orbital Engineering in Epitaxial Graphene on SiC Probed by Cross-Sectional STEM-EELS and FDMNES Simulations

Vinod K. Paidi, Yves Joly, Guillaume Radtke, Vlado K. Lazarov et autres

As silicon hits its physical limits, epitaxial graphene on SiC has emerged as a high-performance successor. While standard graphene lacks a bandgap, the semiconducting "buffer layer" (BL) on the SiC(0001) facet provides a ∼0.6 eV gap and hole mobilities superior to germanium, …

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Atomic-scale origin of rotated epitaxy and its impact on spin-electronic properties at Co2FeSi0.5Al0.5/Ge interface

J. do Nascimento, Zlatko Nedelkoski, Demie Kepaptsoglou, S. Yamada et autres

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Compositional dependence of the electronic structures of Co2FeSi x Al1− x /Ge half-metal/semiconductor interfaces

Zlatko Nedelkoski, J. do Nascimento, Aleksandar Skeparovski, Vlado K. Lazarov

The performances of Co-based Heusler alloys in spintronic devices are often degraded by interfacial effects. We used density functional theory to analyze the electronic structures of Co2FeSixAl1−x/Ge interfaces with Si content x from 0 to 1.0. Consistent with experimental data, interfaces with …

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Atomic-scale observation of vacancy ordering in magnetite nanoparticles

Zlatko Nedelkoski, Paul M. Sharp, J. do Nascimento, Leonardo Lari et autres

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Extending Photovoltaic Module Lifetime Through Targeted Repair of Short-Circuited Bypass Diodes

Ghadeer Badran, Vlado K. Lazarov, Mahmoud Dhimish

Bypass diode failure, particularly in the short-circuit mode, remains an under-addressed reliability issue in photovoltaic (PV) modules, causing severe power suppression and often leading to premature disposal of otherwise functional units. This study presents a non-destructive, field-applicable plug-in repair protocol for restoring …

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Cu 2 ZnSnS 4 – Sporomusa ovata photobiohybrids coupled with Clostridium kluyveri fermentation for CO 2 conversion to C 4 –C 6 fatty acids

Muhammed Rishan, Prabeesh Punathil, Cathal Burns, Elisabetta Arca et autres

(2.4 ± 0.4 µmol). This integrated photocatalysis-fermentation strategy showcases a sustainable route for solar-to-chemical energy conversion, offering a promising solution for carbon valorisation through the convergence of materials science and biotechnology.

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Probing magnons with high-energy electrons: theoretical insights into spin and charge scattering in STEM-EELS

Julio A. do Nascimento, D. M. Cheshire, Fabrizio Cossu, Adam Kerrigan et autres

Abstract In this work, we provide fundamental insights into the scattering mechanisms of non-spin-polarised electron beams with magnetic systems, as implemented in modern meV-level scanning transmission electron microscopy electron energy loss spectroscopy (STEM-EELS) instruments. We demonstrate that the charge contribution to electron-probe-magnon …

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Structural and Magnetic Properties of Sputtered Chromium-Doped Sb2Te3 Thin Films

Joshua Bibby, Angadjit Singh, Emily Heppell, Jack Bollard et autres

Magnetron sputtering offers a scalable route to magnetic topological insulators (MTIs) based on Cr-doped Sb2Te3. We combine a range of X-ray diffraction (XRD), reciprocal-space mapping (RSM), scanning transmission electron microscopy (STEM), scanning TEM-energy-dispersive X-ray spectroscopy (STEM-EDS), and X-ray absorption spectroscopy, and X-ray …

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Polar oxide/semiconductor heterojunction: MgO (111)/SiC (0001)

Julio A. do Nascimento, Daniel Pingstone, Adam Kerrigan, Kenta Yoshida et autres

The layered structures of polar oxides (i.e., metal/oxygen/metal/oxygen/…) can be utilized to engineer the atomic structures and thus tailor the electronic properties of polar oxide/semiconductor interfaces, including the band offsets between the technologically important MgO and SiC for complementary metal–oxide–semiconductor and spintronic …

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Magnon spectroscopy in the electron microscope

Demie Kepaptsoglou, José Ángel Castellanos-Reyes, Adam Kerrigan, Julio A. do Nascimento et autres

Abstract The miniaturization of transistors is approaching its limits owing to challenges in heat management and information transfer speed 1 . To overcome these obstacles, emerging technologies such as spintronics 2 are being developed, which make use of the electron’s spin as …

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