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Now showing items 111-120 of 2110
Spin-polarized tunneling effects observed on the oxygen-terminated Fe3O4 (111) surface
(2004)
Under oxidizing preparation conditions the magnetite (111) surface reconstructs to a highly ordered superlattice. This surface reconstruction represents an oxygen termination of the magnetite bulk. We employ spin-polarized ...
Modelling, development and characterisation of Microwave Kinetic Inductance Detectors for optical astronomy
(Trinity College Dublin. School of Physics. Discipline of Physics, 2022)
In this thesis I report on the research I carried out on the topic of Microwave Kinetic
Inductance Detectors (MKIDs) over the last four years.
After an introduction chapter and a literature review on MKIDs, Chapter 3 ...
The kinematics and morphology of solar coronal mass ejections
(Trinity College (Dublin, Ireland). School of Physics, 2010)
Solar coronal mass ejections (CMEs) are large-scale eruptions of plasma and magnetic field from the Sun into the corona and interplanetary space. They are the most significant drivers of adverse space weather at Earth and ...
Three-state dual spin valve structure
(2010)
A dual spin valve is built with exchange bias on the top and bottom pinned layers and a central free layer. By suitable choice of the antiferromagnetic and ferromagnetic layer thicknesses, it is possible to separate the ...
Electronic structure study of defects and impurities in oxide semiconductors
(Trinity College (Dublin, Ireland). School of Physics, 2012)
In this work, the crystal and electronic structures of defects and impurities
in ZnO and Fe3O4 are studied using first principles calculations.
B3LYP hybrid density-functional theory calculations were used
with supercell ...
Calculation of model Hamiltonian parameters for LaMnO3 using maximally localized Wannier functions
(2010)
In this work we demonstrate that maximally localized Wannier functions (MLWFs) based on Kohn-Sham band structures provide a very robust and systematic way to construct realistic, materials-specific tight-binding models for ...
Topological surface states scattering in antimony
(2012)
In this work we study the topologically protected states of the Sb(111) surface by using ab initio transport theory. In the presence of a strong surface perturbation we obtain standing-wave states resulting from the ...
Transition between large and small electron polaron at neutral ferroelectric domain walls in BiFeO3
(2021)
Ferroelectric domain walls are planes within an insulating material that can accumulate and conduct charge carriers, hence the interaction of the domain walls with the charge carriers can be important for photovoltaic and ...
Modification of anisotropy in ultra-thin magnetic layers
(Trinity College (Dublin, Ireland). School of Physics, 2010)
The areal density of modem magnetic storage stands somewhere between 200-300 Gb/in2. The scaling of current continuous medium technology is expected to reach a limit below 1 Tb/in2. Future technologies require discontinuous ...
Fine structure of coupled optical modes in photonic molecules
(2004)
We report on the coherent coupling of whispering gallery modes (WGM) in a photonic molecule formed
from two melamine-formaldehyde spherical microcavities with a thin shell of CdTe nanocrystals. Utilizing a
microporous ...