A5045541185- Magnetic properties of thin films
- Magnetic and transport properties of perovskites and related materials
- Electronic and Structural Properties of Oxides
- Transition Metal Oxide Nanomaterials
- Advanced Condensed Matter Physics
- Semiconductor materials and devices
- Ferroelectric and Piezoelectric Materials
- Multiferroics and related materials
- Advanced Memory and Neural Computing
- Magnetic Properties of Alloys
- Force Microscopy Techniques and Applications
- Metal and Thin Film Mechanics
- ZnO doping and properties
- Solid-state spectroscopy and crystallography
- Silicon Nanostructures and Photoluminescence
- Copper Interconnects and Reliability
- Quantum Dots Synthesis And Properties
- Nuclear Physics and Applications
- Glass properties and applications
- Plasmonic and Surface Plasmon Research
- Perovskite Materials and Applications
- Acoustic Wave Resonator Technologies
- Semiconductor materials and interfaces
- Optical Polarization and Ellipsometry
- Advanced Surface Polishing Techniques
Trinity College Dublin
2014-2019
Advanced Materials and BioEngineering Research
2017-2019
IMEC
2015
The magnetization of thin films cobalt ferrite frequently falls far below the bulk value 455 kAm-1, which corresponds to an inverse cation distribution in spinel structure with a significant orbital moment about 0.6 muB that is associated octahedrally-coordinated Co2+ ions. responsible for magnetostriction and magnetocrystalline anisotropy, its sensitivity imposed strain. We have systematically investigated magnetism produced by pulsed-laser deposition on different substrates (TiO2, MgO,...
Abstract Ionic liquid gating is a versatile method for inducing metal-insulator transition in field-effect transistor device structures. The mechanism of carrier doping metal oxide films under debate. WO 3 film-based field effect discussed this report. Flat and relatively smooth were deposited on SrTiO substrates by pulsed laser deposition. Swept constant gate voltage characteristics are measured both argon oxygen atmospheres. results show clear dependence the pressure experimental chamber....
The authors have investigated the dispersion of magnetic excitations in thin films antiferromagnetic NiO using resonant inelastic x-ray scattering (RIXS) at ${L}_{3}$ edge nickel. They demonstrate here that, thanks to recent improvements energy resolution and geometry, soft RIXS is a valid complement neutron this field because it allows clear identification spin-wave peaks not only bulk crystals but also heterostructures too small for studies. Moreover, measured along three high-symmetry...
Porous organosilicate glass thin films, with k-value 2.0, were exposed to 147 nm vacuum ultra-violet (VUV) photons emitted in a Xenon capacitive coupled plasma discharge. Strong methyl bond depletion was observed, concomitant significant increase of the bulk dielectric constant. This indicates that, besides reactive radical diffusion, during processing do impede properties and therefore need be tackled appropriately patterning integration. The detrimental effect VUV irradiation can partly...
The magnetic dead layers in films a few nanometers thick are investigated for La$_{0.7}$Sr$_{0.3}$MnO$_3$ on (001)-oriented SrTiO$_3$ (STO), LaAlO$_3$ (LAO) and (LaAlO$_3$)$_{0.3}$(Sr$_2$TaAlO$_6$)$_{0.7}$ (LSAT) substrates. An anomalous moment found to persist above the Curie temperature of is not attributed films, but oxygen vacancies at or near surface substrate. contribution from substrate as high 20 $\mu$B/nm$^2$ case STO LSAT. effect increased by adding an cap layer. Taking this d-zero...
Abstract Considerable attention has been drawn to the lead halide perovskites (LHPs) because of their outstanding optoelectronic characteristics. LHP nanosheets (NSs) grown from single crystalline possess advantages in device applications as they provide possibility for control over morphology, composition, and crystallinity. Here, free-standing bromide (PbBr 2 ) single-crystalline NSs with sizes up one centimeter are synthesized solution. These can be converted while maintaining NS...
The magnetism of different polar and nonpolar cuts single-crystal oxide substrates has been analysed. In addition to their intrinsic diamagnetism, some crystals exhibit a Curie-law susceptibility, which is associated with 3d impurities at the 1 ppm level, except for MgO where it ~30 ppm. Others an anhysteretic ferromagnetic-like signal typical d <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sup> magnetism. magnitude saturation moment...
This work reports the successful fabrication of an all-oxide heteroepitaxial structure with a bilayer tunnel junction consisting ferroelectric and ferrimagnetic layers. Each layer exhibits high crystallinity well-defined interfaces. The transport properties are found to be well described by characteristics asymmetric junction.
Summary form only given. The magnetic dead layers in films a few nanometers thick are investigated for La <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0.7</sub> Sr xmlns:xlink="http://www.w3.org/1999/xlink">0.3</sub> MnO xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> on SrTiO (STO), LaAlO (LAO) and (LaAlO )(Sr xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> TaAlO xmlns:xlink="http://www.w3.org/1999/xlink">6</sub> ) (LSAT) substrates....
The discovery of the interstitial rare earth nitride Sm <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> Fe xmlns:xlink="http://www.w3.org/1999/xlink">17</inf> N xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> came about seven years after iron boride Nd [1],[2], and initially seemed to offer intrinsic magnetic properties that were superior (Curie temperature $T_{C}$, magnetocrystalline anisotropy $K_{1})$ or comparable (spontaneous...
The characterisation of BaTiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> thin films by direct piezoelectric effect microscopy (DPFM) is presented. technique allows for both the mapping polarisation surface, imaging lines constant electrostatic force over a polarised region, but also piezo coefficient, via acoustically excited, lock-in demodulated, induced piezo-voltage response same region. ability to objectively discriminate...
The possibility to reversibly modify the optical properties of plasmonic nanorod arrays by phase change materials is investigated. Three different gold (Au) are fabricated on thin films vanadium dioxide. sensitivity two modes thermally induced transition explored and found be greatest for transverse mode. We demonstrate that reflectance can modified in spectral range from 500 nm 1 μm. Moreover a blue shift 40 mode scattering wavelength observed. Our results render VO <sub...
Over the past decade intensive research has focused on use of plasmonic structures and metamaterials for control electromagnetic radiation. Response such is highly dependent factors set during fabrication, as combination materials used well their structural dimensions. Despite having many promising optoelectronic applications, inability to tune optical response post fabrication presents serious limitations. To overcome this, we present tunable elements formed nanostructures a thin film...