Browsing Physics (Scholarly Publications) by Sponsor "Science Foundation Ireland"
Now showing items 41-60 of 133
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Ferromagnetic nanoparticles with strong surface anisotropy: Spin structures and magnetisation processes
(American Physcial Society, 2008)Monte Carlo simulations are used to investigate the effect of surface anisotropy on the spin configurations and hysteresis loops of ferromagnetic nanoparticles. Spherical particles of radius ?a are composed of N atoms ... -
Ferromagnetism in Fe-doped SnO2 thin films
(American Physical Society, 2004)Thin films grown by pulsed-laser deposition from targets of Sn0.95Fe0.05O2 are transparent ferromagnets with Curie temperature and spontaneous magnetization of 610 K and 2.2?A?m2?kg?1, respectively. The 57Fe Mossbauer ... -
First principles studies of multiferroic materials
(2009)Multiferroics, materials where spontaneous long-range magnetic and dipolar orders coexist, represent an attractive class of compounds, which combine rich and fascinating fundamental physics with a technologically appealing ... -
First-principles study of the influence of (110)-oriented strain on the ferroelectric properties of rutile TiO2
(American Physical Society, 2011)We use first-principles density-functional theory to investigate the softening of polar phonon modes in rutile TiO(2) under tensile (110)-oriented strain. We show that the system becomes unstable against a ferroelectric ... -
Genetic algorithm optimization of high order surface etched grating tunable laser array
(2020)A genetic algorithm is developed with a view to optimizing surface-etched grating tunable lasers over a large optimization space comprised of several variables. Using this approach, a new iteration of slotted lasers arrays ... -
Growth of n-type ?-CuCl with improved carrier concentration by pulsed dc sputtering: Structural, electronic and UV emission properties
(2011)? Copper (I) chloride is naturally a direct band gap, zincblende and p-type semiconductor material with much potential in linear and non-linear optical applications owing to its large free excitonic binding energy. In order ... -
High Selectivity and Sensitivity in Chemiresistive Sensing of Co(II) Ions with Liquid-Phase Exfoliated Functionalized MoS2: A Supramolecular Approach
(2023)Chemical sensing of water contamination by heavy metal ions is key as it represents a most severe environmental problem. Liquid-phase exfoli-ated two-dimensional (2D) transition metal dichalcogenides (TMDs) are suitable ... -
High-Concentration Solvent Exfoliation of Graphene.
(Wiley-Blackwell, 2010)We demonstrate a method to prepare graphene dispersions at high concentrations, up to 1.2 mg/ml, with yields of up to 4wt% monolayers. This process relies on low-power sonication for long times, up to 460 hours. TEM shows ... -
In Situ Thermometry of a Cold Fermi Gas via Dephasing Impurities
(2020)The precise measurement of low temperatures is a challenging, important, and fundamental task for quantum science. In particular, in situ thermometry is highly desirable for cold atomic systems due to their potential for ... -
Influence of annealing on the bias voltage dependence of tunnelling magnetoresistance in MgO double-barrier magnetic tunnel junctions with CoFeB electrodes
(American Institute of Physics, 2006)Double-barrier magnetic tunnel junctions with two MgO barriers and three CoFeB layers exhibiting tunneling magnetoresistance (TMR) values of more than 100% were fabricated. The bias voltage dependence of the TMR ratio is ... -
Influence of elastic strains on the mask ratio in glassy polymer nanoimprint
(American Institute of Physics, 2005)During glassy polymer nanoimprint, a supported film is extruded from protruding spunchd to recessed scavityd regions of a patterned stamp. The completeness of this extrusion determines the mask ratio for lithographic ... -
Influence of the annealing field strength on exchange bias and magnetoresistance of spin valves with IrMn
(American Institute of Physics, 2005)We report on field annealing effects in spin valves with an IrMn pinning layer and spin valves with a synthetic antiferromagnet. The exchange bias field and magnetoresistance of spin valves with an IrMn/CoFe bilayer at ... -
Interaction of cationic surfactants with DNA: a single-molecule study
(2008)The interaction of cationic surfactants with single dsDNA molecules has been studied using forcemeasuring optical tweezers. For hydrophobic chains of length 12 and greater, pulling experiments show characteristic ... -
IrMn as exchange-biasing material in systems with perpendicular magnetic anisotropy
(American Institute of Physics, 2005)Contact between a Co/Pt multilayer and an IrMn film leads to perpendicular exchange bias. The exchange bias field does not depend on the degree of (111) film texture and for Co/Pt multilayers with IrMn at the bottom it can ... -
Liquid phase exfoliation of carbonate-intercalated layered double hydroxides
(2019)Direct exfoliation of a carbonate layered double hydroxide (LDH) has been achieved by using a novel horn-probe sonic tip, avoiding the development of time-consuming anion-exchange reactions. The most suitable solvents were ... -
Long-ranged dynamic magnetic interaction through low-dimensional systems
(American Physical Society, 2008)Magnetic units attached to low-dimensional metallic nanowires are known to interact via the conduction electrons of the wire leading to preferential alignment directions of the respective magnetic moments. In addition to ... -
Low cost, high performance ultrafiltration membranes from glass fiber-PTFE–graphene composites
(2020)The development of low-cost ultrafiltration membranes with relatively high flow rate and selectivity is an important goal which could improve access to clean water in the developing world. Here we demonstrate a method to ...