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Now showing items 631-640 of 2111
Switching a single spin on metal surfaces: ab initio studies
(2009)
The exchange coupling between single
3
d
magnetic adatoms (Cr, Mn, Fe, and Co) adsorbed on a
Cu(001) surface and a Cr STM tip is studied with
ab initio
calculations. We demonstrate that the spin
direction of single ...
Polarisation distribution for internal conical diffraction and the superposition of zero and first order bessel beams
(2008)
Internal conical refraction leads to the formation of zero (J0) and first order (J1) Bessel beams in superposition. The
(J0) beam retains the input circular polarisation and the (J1) has opposite polarisation but with a ...
Functional nanostructures self-assembled on templated surfaces
(Trinity College (Dublin, Ireland). School of Physics, 2013)
This work consists of surface studies of three systems; firstly, the growth of Fe nanoclusters on the Ge(001) surface has been studied using low-temperature scanning tunneling microscopy (STM), X-ray magnetic circular ...
Characterisation of laser produced plasmas
(Trinity College (Dublin, Ireland). School of Physics, 2006)
This thesis describes the apphcation of planar Langmuir probes in laser produced plasmas.
The influence of the ion flow on the probe behaviour and its effect on the measured plasma
parameters has been investigated for ...
Origin of the x-ray-absorption fine structure in photon-stimulated ion desorption from Si-adsorbate systems
(1992)
There is no general agreement on whether photon-stimulated ion desorption (PSID) extended and near-edge x-ray-absorption fine structure (EXAFS and NEXAFS) can provide surface structural information. To address this question, ...
Magnetic noise in structured hard magnets
(2010)
The anomalous Hall effect of wires patterned from ?Co90Fe10=Pt?n multilayers, with 10 n 50, is
used to determine the magnetization process in a small volume of maze domains. Time-independent 1=f
noise appears in ...
In situ synthesis and optical limiting response of poly(N-vinylcarbazole) functionalized single-walled carbon nanotubes
(Institute of Physics, 2010)
A new poly(N-vinylcarbazole)-covalently grafted single-wall carbon nanotube (SWNT?PVK) hybrid material was synthesized by an in situ anionic polymerization reaction of N-vinylcarbazole and the negatively charged SWNTs. ...
Gate controlled spin pumping at a quantum spin Hall edge
(2013)
We propose a four-terminal device designed to manipulate by all electrical means the spin of a magnetic adatom positioned at the edge of a quantum spin Hall insulator. We show that an electrical gate, able to tune the ...
Exchange interactions and magnetic phases of transition metal oxides: Benchmarking advanced ab initio methods
(2011)
The magnetic properties of the transition metal monoxides MnO and NiO are investigated at equilibrium and under pressure via several advanced first-principles methods coupled with Heisenberg Hamiltonian Monte Carlo. The ...