Browsing Physics (Scholarly Publications) by Title
Now showing items 514-533 of 1664
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Fabrication of magnetic force microscopy tips by electrodeposition and focused ion beam milling
(IEEE, 2008)A method is described for the fabrication of magnetic force microscopy tips via localized electrodeposition and focused ion beam milling departing from commercial tapping mode tips. Very high aspect ratios and interacting ... -
A facetless laser suitable for monolithic integration
(IEEE, 2008)A novel facetless laser structure is proposed and demonstrated. The facetless laser is realised by etching deep slots into the mirror sections of a multi section semiconductor laser which provide the feedback for laser ... -
A facile "bottom-up" approach to prepare free-standing nano-films based on manganese coordination clusters
(2013)We present herein a novel method to prepare free-standing Dried Foam Films (DFFs) whereby individual polynuclear manganese complexes cover quantitatively the holes of micro-grids; the fabricated, homogeneous films have a ... -
Far ultraviolet spectroscopic explorer observations of the symbiotic star AG Draconis
(American Astronomical Society, 2005)Spectra of the bright symbiotic star AG Draconis (BD +67?922) in the wavelength range 905-1187 ? obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE) are presented. The spectra show a number of narrow, nebular ... -
Far-ultraviolet observations of NGC 3516 using the Hopkins ultraviolet telescope
(American Astronomical Society, 1996)We observed the Seyfert 1 galaxy NGC 3516 twice during the flight of Astro-2 using the Hopkins Ultraviolet Telescope aboard the Space Shuttle Endeavour in March 1995. Simultaneous X-ray observations were performed with the ... -
Far-ultraviolet observations of NGC 4151 during the ORFEUS-SPAS II mission
(American Astronomical Society, 1998)We observed the Seyfert 1 galaxy NGC 4151 on 11 occasions at 1-2 day intervals using the Berkeley spectrometer during the ORFEUS-SPAS II mission in 1996 November. The mean spectrum covers 912-1220 A at ~0.3 A resolution ... -
Far-ultraviolet spectra of broad absorption line QSOs and constraints on models for the ionization structure and metallicity of the BAL-region gas
(American Astronomical Society, 1996)Hubble Space Telescope Faint Object Spectrograph G270H spectra of four moderate-to high-redshift broad absorption line (BAL) QSOs are presented. In addition, evidence is discussed that indicates that the gas that gives ... -
The far-ultraviolet spectrum of NGC 4151 as observed with the Hopkins ultraviolet telescope on Astro-2
(American Astronomical Society, 1995)We observed NGC 4151 on six separate occasions at intervals of 1 to 3 days using the Hopkins Ultraviolet Telescope during the flight of Astro-2 aboard the space shuttle Endeavour in 1995 March. The far-UV spectra cover the ... -
Far-UV Emissions of the Sun in Time: Probing Solar Magnetic Activity and Effects on Evolution of Paleo-Planetary Atmospheres
(American Astronomical Society, 2003)We present and analyze Far Ultraviolet Spectroscopic Explorer (FUSE) observations of six solar analogs. These are single, main-sequenceG0?5 stars selected as proxies for the Sun at several stages of its main-sequence ... -
Fast ab initio methods for the calculation of adiabatic spin wave spectra in complex systems
(American Physical Society, 2001)The interpretation of the physics of magnets with reduced dimensionality often requires information on the spin wave excitations at arbitrary wavelengths which is generally hard to obtain experimentally. Two powerful methods ... -
Fe Nanoclusters on the Ge(001) Surface Studied by Scanning Tunnelling Microscopy, Density Functional Theory Calculations and X-Ray Magnetic Circular Dichroism
(2011)The growth of Fe nanoclusters on the Ge(001) surface has been studied using low-temperature scanning tunneling microscopy (STM) and density functional theory (DFT) calculations. STM results indicate that Fe nucleates on ... -
Fe- and Co-based magnetic tunnel junctions with AlN and ZnO spacers
(2022)AlN and ZnO, two wide band-gap semiconductors extensively used in the display industry, crystallize in the wurtzite structure, which can favor the formation of epitaxial interfaces to close-packed common ferromagnets. Here ... -
Feature issue introduction: nanocarbon for photonics and optoelectronics
(Optical Society of America, 2012)Nanocarbons possess a variety of nearly ideal, low-dimensional nanostructures that cause them to attain unique electronic and optical properties. Recent linear and nonlinear spectroscopic and optoelectronic results prove ... -
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 ... -
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, ...
