Browsing Physics (Theses and Dissertations) by Title
Now showing items 186-205 of 420
-
Magnetic Characteristics of Sunspot Groups and their Role in Producing Adverse Space Weather
(Trinity College Dublin. School of Physics. Discipline of Physics, 2019)The energy that powers solar flares is known to come from magnetic energy stored in sunspot groups, but the precise conditions required and processes involved in energy release remain unclear. The likelihood of ... -
Magnetic field effects on electrodeposition and the properties of electrodeposited nickel and nickel-copper
(Trinity College (Dublin, Ireland). School of Physics, 2004)The association of magnetism and electrodeposition is studied from two separate perspectives. Firstly the effect of an applied magnetic field on the deposition process and secondly the production of magnetic materials by ... -
Magnetic field effects on the electrodeposition and electrodissolution of copper
(Trinity College (Dublin, Ireland). School of Physics, 2001)The effect of a static magnetic field on the electrodeposition and electrodissolution of copper in acidified copper sulphate solution was investigated. The primary effect of the field was to increase the rate of mass ... -
Magnetic field effects on water and aqueous solutions
(Trinity College Dublin. School of Physics. Discipline of Physics, 2022)Claims of magnetic field effects on water and their potential use in a microfluidic channel are explored. The pendant drop method is used to measure the surface tension, which is calculated from the shape of the drop. The ... -
Magnetic Fields and Accretion Processes in Young Stars: A case study of the classical T Tauri star DK Tau
(Trinity College Dublin. School of Physics. Discipline of Physics, 2024)Low-mass young stars that are a few million years old and called classical T Tauri stars (cTTs) experience magnetospheric accretion. They are surrounded by a circumstellar disk (which consists of an inner and outer disk) ... -
Magnetic investigations of Mn-based and Mn-free potential half metals
(Trinity College Dublin. School of Physics. Discipline of Physics, 2022)This thesis is concerned with an unusual category of magnetically ordered material, the zero moments ferrimagnetic half metal, which has potential for applications in thin film memory and logic devices. The materials are ... -
Magnetic semiconductors for spin electronics
(Trinity College (Dublin, Ireland). School of Physics, 2010)The development of the relatively new field of spin electronics is based on the possibility of manipulating the spin of the electron through a structure. If one aspect is to develop new device architecture to inject, ... -
The Magnetic, Magneto-transport and Magneto-optical Properties of Mn4-xGaxN Thin Films
(Trinity College Dublin. School of Physics. Discipline of Physics, 2024)Thin film Mn4N has recently gained a lot of attention for possible use in spintronic applications, owing to its perpendicular magnetic anisotropy (PMA), low saturation magnetisation and large anomalous Hall effect (AHE). ... -
Magnetism in dilute magnetic oxides and related materials
(Trinity College (Dublin, Ireland). School of Physics, 2007)The work in this thesis is focussed on the magnetic properties of dilute ferromagnetic semiconducting oxides and related materials. Since the first report of unexpected room temperature ferromagnetism in anatase and rutile ... -
Magnetization processes and low frequency fluctuations in micromagnetic structures
(Trinity College (Dublin, Ireland). School of Physics, 2010)The study presented in this thesis is concerned with low frequency fluctuations in magnetic systems. Three different systems were investigated. The first system is (CoFe/Pt)n multilayers patterned into micrometer scale ... -
Magnetization, Anomalous Hall Effect and Single Pulse Partial All-optical Switching in Amorphous Rare-earth Transition-metal Thin Films
(Trinity College Dublin. School of Physics. Discipline of Physics, 2023)Research on rare-earth (R) transition-metal (T) thin films has a long history. A revival of interest in this field was sparked by the discovery of single pulse all-optical switching (SP-AOS) in a-GdFeCo1 alloy thin films ... -
Manipulating atoms using scanning probe microscopy
(Trinity College (Dublin, Ireland). School of Physics, 2009)Manipulating species using Scanning Probe Microscopy (SPM) is an important discipline in the field of bottom-up fabrication, which facilitates nano-mechanics and electron dynamics investigations. Previous low temperature ... -
Manipulation of Vanadium Oxide Characteristics for Applications: Resistive switching & Reflectance Anisotropy Spectroscopy
(Trinity College Dublin. School of Physics. Discipline of Physics, 2022)This thesis deals with the study of vanadium dioxide, vanadium pentoxide and the mixed 4+ and 5+ valence vanadium oxide phases, or Wadsley phases. Thin films (VO2) and single crystals (V2O5) are examined. Vanadium dioxide ... -
Material selection for Spin-Transfer-Torque Magnetic Random Access Memories: a High-Throughput approach
(Trinity College Dublin. School of Physics. Discipline of Physics, 2020)A Spin-Transfer-Torque Magnetic Random Access Memory (STT-MRAM) is a complex multilayered structure, whose sensitive element is formed by two ferromagnetic layers sandwiching an insulator, acting as a tunnel barrier. The ... -
Materials for epitaxial superconducting heterostructures: Nb, NbN and NbO/Nb
(Trinity College Dublin. School of Physics. Discipline of Physics, 2023)Josephson Junctions are junctions that operate under the Josephson effect, the tunnelling of electrons through a non-superconducting layer between two superconducting layers. They are popular candidates for the realisation ... -
Mechanical and morphological properties of carbon nanotubes polymeric composites
(Trinity College (Dublin, Ireland). School of Physics, 2009)Carbon nanotubes (CNT) are incorporated to the polymers to enhance their electrical and mechanical properties. All of the samples in this thesis were prepared from the liquid phase using the solution casting method. The ... -
Mechanical Characterisation of Printed Nanosheet Network Thin Films
(Trinity College Dublin. School of Physics. Discipline of Physics, 2024)The response of materials to applied stress and the resulting deformation is a fundamental cornerstone of condensed matter physics and materials research. From exciting new prospects such as the conductive nanosheet ... -
Mechanical properties of advanced nanosturctured composite fibres containing carbon nanotubes and graphene
(Trinity College (Dublin, Ireland). School of Physics, 2012)A comprehensive study of the mechanical properties of coagulation spun poly(vinyl) alcohol-nanotube composite fibres has been performed. A method has been developed to control and measure the nanotube volume fraction, Vf, ... -
Mechanical properties of biopolymers reinforced with carbon nanotubes
(Trinity College (Dublin, Ireland). School of Physics, 2008)Three biopolymers; poly(methyl methacrylate) (PMMA); poly(L-lactic acid) (PLLA); poly(vinyl alcohol) (PVA) and an engineered spider silk (Biosteel ®) have been independently doped with carbon nanotubes. PM MA was functionalised ... -
Mechanical properties of carbon nanotube polymer composites
(Trinity College (Dublin, Ireland). School of Physics, 2002)In this study the production and optimisation of carbon nanotubes using the arc discharge method was investigated. The soot produced was analysed for the nanotube content. To remove the nanotubes from the soot a novel ...
