Browsing Physics by Title
Now showing items 832-851 of 2104
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I-V curves of Fe/MgO (001) single- and double-barrier tunnel junctions.
(2008)In this work, we calculate with ab initio methods the current-voltage characteristics for ideal single- and double-barrier Fe/MgO 001 magnetic tunnel junctions. The current is calculated in the phase-coherent ... -
Imaging and identification of point defects in PtTe2
(2021)The properties and performance of two-dimensional (2D) materials can be greatly affected by point defects. PtTe2, a 2D material that belongs to the group 10 transition metal dichalcogenides, is a type-II Dirac semimetal, ... -
Imaging domains in a zero-moment half-metal
(2019)We have a choice of methods for examining domains at the surface of a ferromagnet that depend on probing the stray field distribution, but these methods do not work in antiferromagnets or compensated ferrimagnets, which ... -
Impact of bias current distribution on the noise figure and power saturation of a multicontact semiconductor optical amplifier
(2011)We present an experimental investigation of a multicontact semiconductor optical amplifier. This first-generation device allows for direct control of the carrier density profile along the length of the waveguide. This is ... -
Impact on structural, optical and electrical properties of CuCl by incorporation of Zn for n-type doping
(2006)γ-CuCl is a wide-band gap (Eg = 3.395eV at 4 K) , direct band gap, semiconductor material with a cubic zincblende lattice structure. A very large exciton binding energy (190 meV), assures efficient exciton-based emission ... -
Implementation of Morse-Witten theory for a polydisperse wet 2D foam simulation
(Taylor & Francis, 2019-06)The Morse–Witten theory provides a formulation for the inter-bubble forces and corresponding deformations in a liquid foam, accurate in the limit of high liquid fraction. Here we show how the theory may be applied in ... -
Implementation of self interaction free density functional methods and applications to dilute magnetic semiconductors
(Trinity College (Dublin, Ireland). School of Physics, 2008)The present thesis mainly deals with the implementation of self interaction free density functional methods in a numerically efficient density functional theory code SIESTA and the application of the said methods in ab-inito ... -
Implications of antiphase boundaries (APBs) on the strain relaxation and magnetotransport properties of Fe3o4 hetero-epitaxial thin films
(Trinity College (Dublin, Ireland). School of Physics, 2007)The strain relaxation and magneto transport properties of epitaxial magnetite (Fe3O4) thin films were studied. Epitaxial Fe3O4 film s were grown on MgO and MgAl2O4 substrates using an Oxygen plasma assisted Molecular beam ... -
Improved adhesive strength and toughness of polyvinyl acetate glue on addition of small quantities of graphene
(2013)We have prepared composites of polyvinyl acetate (PVAc) reinforced with solution exfoliated graphene. We observe a 50% increase in stiffness and a 100% increase in tensile strength on addition of 0.1vol% graphene compared ... -
Improved Solar Thermal Technology For Decarbonising Residential Heating
(School of Physics, Physics, 2023)The field of solar energy harvesting has emerged over the last number of years as one with considerable scope to provide clean and renewable electricity and heat. Solar Thermal (ST) technology is vital to tackle the pressing ... -
Improving the mechanical properties of graphene oxide based materials by covalent attachment of polymer chains
(2013)We report on the modification of graphene oxide (GO) with polyvinylalcohol (PVA) leading to the mechanical improvement of GO based materials. First, GO was covalently functionalised with PVA by esterification of carboxylic ... -
Improving the Mechanical Properties of Single-Walled Carbon Nanotube Sheets by Intercalation of Polymeric Adhesives
(2003)Organic polymers, such as poly(vinyl alcohol), poly(vinyl pyrrolidone), and poly(styrene), were intercalated into single-walled carbon nanotube sheets by soaking the sheets in polymer solutions. Even for short soak times, ... -
Impurities and magnetic interactions in graphene : a theoretical study
(Trinity College (Dublin, Ireland). School of Physics, 2012)Graphene is a two-dimensional carbon material that until its recent discovery was assumed not to exist in the free state. Graphene-related materials have been in the scientific limelight since then due to several key ... -
Impurity band magnetism in organic semiconductors
(2019)Recent experiments and theoretical studies have proposed that spin-transport in organic semiconductors, in particular in Alq3, may occur in an impurity band. Here we model the electronic and magnetic properties of such ... -
Impurity invisibility in graphene: Symmetry guidelines for the design of efficient sensors
(2016)Renowned for its sensitivity to detect the presence of numerous substances, graphene is an excellent chemical sensor. Unfortunately, which general features a dopant must have in order to enter the list of substances ... -
In operandi observation of dynamic annealing: A case study of boron in germanium nanowire devices
(2015)We report on the implantation of boron in individual, electrically contacted germanium nanowires with varying diameter and present a technique that monitors the electrical properties of a single device during implantation ...
