Browsing School of Physics by Title
Now showing items 655-674 of 2114
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Femtosecond laser ablation of metals
(Trinity College (Dublin, Ireland). School of Physics, 2015)Femtosecond laser ablation of metals and dielectrics is currently very topical due to its new and distinctive ablation process and the growing number of applications. The ablation process is rather complex and results in ... -
Femtosecond ultraviolet laser ablation of silver and comparison with nanosecond ablation
(2013)The ablation plume dynamics arising from ablation of silver with a 500 fs, 248nm laser at 2Jcm 2 has been studied using angle-resolved Langmuir ion probe and thin film deposition techniques. For the same laser fluence, ... -
Fermi level spin polarization of polycrystalline thulium by point contact Andreev reflection spectroscopy
(2011)The spin polarization near the Fermi level in bulk polycrystalline ferrimagnetic thulium is investigated by means of point contact Andreev reflection (PCAR), in the temperature interval (1.9?9.2 K). The highest polarization ... -
Ferrimagnetism of the magnetoelectric compound Cu2OSeO3 probed by Se-77 NMR
(2010)We present a thorough 77Se NMR study of a single crystal of the magnetoelectric compound Cu2OSeO3. The temperature dependence of the local electronic moments extracted from the NMR data is fully consistent with a magnetic ... -
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 ... -
Ferromagnetic polarons in La0.5Ca0.5MnO3 and La0.33Ca0.67MnO3
(2003)Unrestricted Hartree-Fock calculations on La0.5Ca0.5MnO3 and La0.33Ca0.67MnO3 in the full magnetic unit cell show that the magnetic ground states of these compounds consist of 'ferromagnetic molecules' or polarons ordered ... -
Ferromagnetic resonance damping mechanisms in CoFeB thin films with Cr substitution
(2023)The substitution of iron atoms by chromium in CoFeB films has been proposed to reduce the critical current density Jc for current-driven magnetization switching in spin transfer torque devices by reducing its magnetization. ... -
Ferromagnetic resonance of magnetite films and iron nanowires
(Trinity College (Dublin, Ireland). School of Physics, 2010)Ferromagnetic resonance (FMR) measurements were carried out at 9.6 GHz on thin magnetite films and iron nanowire arrays, produced by molecular beam epitaxy (MBE). The aims of the studies were to examine how the magnetic ... -
Ferromagnetism in defect-ridden oxides and related materials
(2010)The existence of high-temperature ferromagnetism in thin films and nanoparticles of oxides containing small quantities of magnetic dopants remains controversial. Some regard these materials as dilute magnetic semiconductors, ... -
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 ... -
Fibre Optic Readout of Microcantilever Arrays for Fast Microorganism Growth Detection
(2012)We present a fibre-optic-based device for the automated readout of microcantilever arrays for fast microorganism growth detection. We determined the ability of our device to track shifts in resonance frequency due to an ... -
Field induced transition in the paramagnetic state of (Sm0.65Sr0.35))MnO3 associated with matnegic clusters
(American Physical Society, 1999)The susceptibility of (Sm0.65Sr0.35)MnO3 shows an unusual temperature dependence above the Curie temperature which is attributed to the presence of small manganese-ion clusters with S?9. A field-induced transition is ... -
Field sensing in MgO double barrier magnetic tunnel junctions with a superparamagnetic Co50Fe50 free layer
(2012)Linear response and low frequency noise have been investigated in MgO double barrier magnetic tunnel junctions with a superparamagnetic Co50Fe50 free layer. Linear and hysteresis-free switching was observed for the Co50Fe50 ... -
Field-effect transistor made of individual V2O5 nanofibers
(American Institute of Physics, 2000)A field-effect transistor (FET) with a channel length of ~ 100 nm was constructed from a small number of individual V2O5 fibers of the cross section 1.5nm?10nm. At low temperature, the conductance increases as the gate ... -
Fields and flares : understanding the complex magnetic topologies of solar active regions
(Trinity College (Dublin, Ireland). School of Physics, 2013)Sunspots are regions of decreased brightness on the visible surface of the Sun (photosphere) that are associated with strong magnetic fields. They have been found to be locations associated with solar flares, which occur ... -
Fields, fractals and flares: characterising magnetic complexity in solar active regions
(Trinity College (Dublin, Ireland). School of Physics, 2009)The main drivers of space weather, solar flares and coronal mass ejections, are thought to originate from active regions on the surface of the Sun. The mechanisms by which active regions produce these eruptive events remains ... -
Final Astro-2 calibration of the Hopkins Ultraviolet Telescope
(University of Chicago Press, 1999)We present the ?nal calibration of the Hopkins Ultraviolet Telescope (HUT) for its ?ight during the Astro-2 space shuttle mission in 1995 March. Aspects of mission operations and instrument performance that a?ect data ... -
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 ... -
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 ...