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Displaying Results 76 - 100 of 3911 on page 4 of 157
Marked
Mark
GaAs interfacial self-cleaning by atomic layer deposition
(2008)
Hinkle, C. L.; Sonnet, A. M.; Vogel, E. M.; McDonnell, Stephen; Hughes, Greg; Milojevic...
GaAs interfacial self-cleaning by atomic layer deposition
(2008)
Hinkle, C. L.; Sonnet, A. M.; Vogel, E. M.; McDonnell, Stephen; Hughes, Greg; Milojevic, M.; Lee, B.; Aguirre-Tostado, F. S.; Choi, K. J.; Kim, H. C.; Kim, J.; Wallace, R. M.
Abstract:
The reduction and removal of surface oxides from GaAs substrates by atomic layer deposition (ALD) of Al2O3 and HfO2 are studied using in situ monochromatic x-ray photoelectron spectroscopy. Using the combination of in situ deposition and analysis techniques, the interfacial "self-cleaning" is shown to be oxidation state dependent as well as metal organic precursor dependent. Thermodynamics, charge balance, and oxygen coordination drive the removal of certain species of surface oxides while allowing others to remain. These factors suggest proper selection of surface treatments and ALD precursors can result in selective interfacial bonding arrangements.
http://doras.dcu.ie/15591/
Marked
Mark
Electrical, structural, and chemical properties of HfO₂ films formed by electron beam evaporation
(2008)
Cherkaoui, K.; Monaghan, S.; Negara, M.A.; Modreanu, M.; Hurley, P.K.; O’Connell, Debor...
Electrical, structural, and chemical properties of HfO₂ films formed by electron beam evaporation
(2008)
Cherkaoui, K.; Monaghan, S.; Negara, M.A.; Modreanu, M.; Hurley, P.K.; O’Connell, Deborah; McDonnell, Stephen; Hughes, Greg; Wright, S.; Barklie, R.C.; Bailey, P.; Noakes, T.C.Q.
Abstract:
High dielectric constant hafnium oxide films were formed by electron beam (e-beam) evaporation on HF last terminated silicon (100) wafers. We report on the influence of low energy argon plasma ( ∼ 70 eV) and oxygen flow rate on the electrical, chemical, and structural properties of metal-insulator-silicon structures incorporating these e-beam deposited HfO2 films. The use of the film-densifying low energy argon plasma during the deposition results in an increase in the equivalent oxide thickness (EOT) values. We employ high resolution transmission electron microscopy (HRTEM), x-ray photoelectron spectroscopy (XPS), and medium energy ion scattering experiments to investigate and understand the mechanisms leading to the EOT increase. We demonstrate very good agreement between the interfacial silicon oxide thicknesses derived independently from XPS and HRTEM measurements. We find that the e-beam evaporation technique enabled us to control the SiOx interfacial layer thickness down to ∼ ...
http://doras.dcu.ie/15592/
Marked
Mark
Time-resolved pump-probe experiments beyond the jitter limitations at FLASH
(2009)
Azima, A.; Düsterer, S.; Radcliffe, P.; Redlin, H.; Stojanovic, N.; Li, Wei B.; Schlarb...
Time-resolved pump-probe experiments beyond the jitter limitations at FLASH
(2009)
Azima, A.; Düsterer, S.; Radcliffe, P.; Redlin, H.; Stojanovic, N.; Li, Wei B.; Schlarb, H.; Feldhaus, J.; Cubaynes, D.; Meyer, M.; Dardis, John; Hayden, Patrick; Hough, Pádraig; Richardson, Vincent; Kennedy, Eugene T.; Costello, John T.
Abstract:
Using a noninvasive, electro-optically based electron bunch arrival time measurement at FLASH (free electron laser in Hamburg) the temporal resolution of two-color pump-probe experiments has been significantly improved. The system determines the relative arrival time of the extended ultraviolet pulse of FLASH and an amplified Ti:sapphire femtosecond-laser pulse at the interaction region better than 90 fs rms. In a benchmarking pump-probe experiment using two-color above threshold ionization of noble gases, an enhancement in the timing resolution by a factor of 4 compared to the uncorrected data is obtained.
http://doras.dcu.ie/15630/
Marked
Mark
Single-shot characterization of independent femtosecond extreme ultraviolet free electron and infrared laser pulses
(2007)
Radcliffe, P.; Düsterer, S.; Azima, A.; Redlin, H.; Feldhaus, J.; Dardis, John; Kavanag...
Single-shot characterization of independent femtosecond extreme ultraviolet free electron and infrared laser pulses
(2007)
Radcliffe, P.; Düsterer, S.; Azima, A.; Redlin, H.; Feldhaus, J.; Dardis, John; Kavanagh, Kevin D.; Luna, H.; Pedregosa-Gutierrez, Jofre; Yeates, Patrick; Kennedy, Eugene T.; Costello, John T.; Delserieys, A.; Lewis, C.L.S.; Taïeb, R.; Maquet, A.; Cubaynes, D.; Meyer, M.
Abstract:
Two-color above threshold ionization of helium and xenon has been used to analyze the synchronization between individual pulses of the femtosecond extreme ultraviolet (XUV) free electron laser in Hamburg and an independent intense 120 fs mode-locked Ti:sapphire laser. Characteristic sidebands appear in the photoelectron spectra when the two pulses overlap spatially and temporally. The cross-correlation curve points to a 250 fs rms jitter between the two sources at the experiment. A more precise determination of the temporal fluctuation between the XUV and infrared pulses is obtained through the analysis of the single-shot sideband intensities.
http://doras.dcu.ie/15631/
Marked
Mark
Vacuum-ultraviolet resonant photoabsorption imaging of laser produced plasmas
(2000)
Hirsch, John S.; Meighan, Oonagh; Mosnier, Jean-Paul; van Kampen, Paul; Whitty, William...
Vacuum-ultraviolet resonant photoabsorption imaging of laser produced plasmas
(2000)
Hirsch, John S.; Meighan, Oonagh; Mosnier, Jean-Paul; van Kampen, Paul; Whitty, William; Costello, John T.; Lewis, C.L.S.; MacPhee, A.G.; Hirst, G.J.; Westhall, J.; Shaikh, W.
Abstract:
We present results from a vacuum-ultraviolet (VUV) "photoabsorption imaging" technique based on the measurement of the time and space resolved absorption of a quasimonochromatic VUV beam from a laser plasma light source. The use of VUV radiation as a probe beam permits direct access to resonance lines of (singly and more highly charged) ions and also to the resonant and nonresonant continua of atoms and ions. In this experiment we have confined ourselves to measurements using the 3p–3d resonances of Ca, Ca+, and Ca2+ as markers of the temporal and spatial distribution of ground state atoms and ions in an expanding laser plasma plume. We show how time resolved column density maps may be extracted from such images. In addition we have extracted plasma plume velocities from the data, which compare well with an analytical laser ablation model.
http://doras.dcu.ie/15656/
Marked
Mark
Short-pulse, extreme-ultraviolet continuum emission from a table-top laser plasma light source
(1997)
Meighan, Oonagh; Gray, Andrew; Mosnier, Jean-Paul; Whitty, William; Costello, John T.; ...
Short-pulse, extreme-ultraviolet continuum emission from a table-top laser plasma light source
(1997)
Meighan, Oonagh; Gray, Andrew; Mosnier, Jean-Paul; Whitty, William; Costello, John T.; Lewis, C.L.S.; MacPhee, A.G.; Allott, R.; Turcu, I.C.E.; Lamb, A.
Abstract:
We have observed extreme-ultraviolet (XUV) “line-free” continuum emission from laser plasmas of high atomic number elements using targets irradiated with 248 nm laser pulses of 7 ps duration at a power density of ∼ 1013 W/cm2. Using both dispersive spectroscopy and streak camera detection, the spectral and temporal evolution of XUV continuum emission for several target atomic numbers has been measured on a time scale with an upper limit of several hundred picoseconds limited by amplified spontaneous emission.
http://doras.dcu.ie/15657/
Marked
Mark
Forked:A Demonstration of Physics Realism in Augmented Reality
(2009)
Beaney, David; Mac Namee, Brian
Forked:A Demonstration of Physics Realism in Augmented Reality
(2009)
Beaney, David; Mac Namee, Brian
Abstract:
In making fully immersive augmented reality (AR) applications, real and virtual objects will have to be seen to physically interact together in a realistic and believable way. This paper describes Forked! a system that has been developed to show how physical interactions between real and virtual objects can be simulated re- alistically and believably through appropriate use of a physics en- gine. The system allows users control a robotic forklift to manipu- late virtual crates in an AR environment. The paper also describes a evaluation experiment in which it is shown that the physical inter- actions between the forklift and the virtual creates are realistic and believable enough to be comparable with the physical interactions between a forklift and real crates.
https://arrow.dit.ie/scschcomcon/55
Marked
Mark
Image charge inclusion in the dielectric sphere revisited
(2012)
Redzic, Dragan; Eldakli, Mohsan; Redzic, Milan
Image charge inclusion in the dielectric sphere revisited
(2012)
Redzic, Dragan; Eldakli, Mohsan; Redzic, Milan
Abstract:
Van Siclen (1988 Am. J. Phys. 56 1142) reported a curious property of a dielectric sphere in the field of an external point charge: the field outside the sphere generated by the combination of the original charge exterior and the Kelvin image charge interior to the sphere is independent of the permittivity of the sphere. In this paper,we simplify and correct the original derivation and give a detailed analysis of the sources of the field. We also present various checks for the theory, providing instructive exercises for advanced undergraduates.
http://doras.dcu.ie/17553/
Marked
Mark
Simulation benchmarks for low-pressure plasmas: capacitive discharges
(2013)
Turner, Miles M.; Derzsi, Aranka; Donko, Zoltan; Eremin, Denis; Kelly, Seán; Lafleur, T...
Simulation benchmarks for low-pressure plasmas: capacitive discharges
(2013)
Turner, Miles M.; Derzsi, Aranka; Donko, Zoltan; Eremin, Denis; Kelly, Seán; Lafleur, Trevor; Mussenbrock, Thomas
Abstract:
Benchmarking is generally accepted as an important element in demonstrating the correctness of computer simulations. In the modern sense, a benchmark is a computer simulation result that has evidence of correctness, is accompanied by estimates of relevant errors, and which can thus be used as a basis for judging the accuracy and efficiency of other codes. In this paper, we present four benchmark cases related to capacitively coupled discharges. These benchmarks prescribe all relevant physical and numerical parameters. We have simulated the benchmark conditions using five independently developed particle-in-cell codes. We show that the results of these simulations are statistically indistinguishable, within bounds of uncertainty that we define. We therefore claim that the results of these simulations represent strong benchmarks, that can be used as a basis for evaluating the accuracy of other codes. These other codes could include other approaches than particle-in-cell simulations, w...
http://doras.dcu.ie/17735/
Marked
Mark
Chemical identification of luminescence due to Sn and Sb in ZnO
(2013)
Cullen, Joseph; Byrne, Daragh; Johnston, K.; McGlynn, Enda; Henry, Martin O.
Chemical identification of luminescence due to Sn and Sb in ZnO
(2013)
Cullen, Joseph; Byrne, Daragh; Johnston, K.; McGlynn, Enda; Henry, Martin O.
Abstract:
We show that the I10 line in ZnO photoluminescence is associated with Sn impurities. The evidence comes from material implanted with radioactive 117Ag, which decays through 117Cd and 117In to stable 117Sn, and 121Ag which decays through the same chain to stable 121Sb. Supporting evidence is provided by ZnO:Sn prepared by the in-diffusion of stable Sn. The I2 and I9 lines are also shown conclusively to be due to In, confirming earlier identifications in the literature. We also observe shallow bound exciton emission at 3.3643(3) eV due to Sb impurities produced at the end of the decay chain of 121Ag.
http://doras.dcu.ie/19600/
Marked
Mark
Atomic oxygen patterning from a biomedical needle-plasma source
(2013)
Kelly, Seán; Turner, Miles M.
Atomic oxygen patterning from a biomedical needle-plasma source
(2013)
Kelly, Seán; Turner, Miles M.
Abstract:
A "plasma needle" is a cold plasma source operating at atmospheric pressure. Such sources interact strongly with living cells, but experimental studies on bacterial samples show that this interaction has a surprising pattern resulting in circular or annular killing structures. This paper presents numerical simulations showing that this pattern occurs because biologically active reactive oxygen and nitrogen species are produced dominantly where effluent from the plasma needle interacts with ambient air. A novel solution strategy is utilised coupling plasma produced neutral (uncharged) reactive species to the gas dynamics solving for steady state profiles at the treated biological surface. Numerical results are compared with experimental reports corroborating evidence for atomic oxygen as a key bactericidal species. Surface losses are considered for interaction of plasma produced reactants with reactive solid and liquid interfaces. Atomic oxygen surface reactions on a reacti...
http://doras.dcu.ie/19725/
Marked
Mark
Models of coherent exciton condensation
(2004)
EASTHAM, PAUL
Models of coherent exciton condensation
(2004)
EASTHAM, PAUL
Abstract:
That excitons in solids might condense into a phase-coherent ground state was proposed about 40 years ago, and has been attracting experimental and theoretical attention ever since. Although experimental confirmation has been hard to come by, the concepts released by this phenomenon have been widely influential. This tutorial review discusses general aspects of the theory of exciton and polariton condensates, focussing on the reasons for coherence in the ground state wavefunction, the BCS to Bose crossover(s) for excitons and for polaritons, and the relationship of the coherent condensates to standard lasers.
http://hdl.handle.net/2262/49386
Marked
Mark
Microcavity quantum-dot systems for non-equilibrium Bose-Einstein condensation
(2010)
EASTHAM, PAUL
Microcavity quantum-dot systems for non-equilibrium Bose-Einstein condensation
(2010)
EASTHAM, PAUL
Abstract:
We review the practical conditions required to achieve a non-equilibrium BEC driven by quantum dynamics in a system comprising a microcavity field mode and a distribution of localised two-level systems driven to a step-like population inversion profile. A candidate system based on eight 3.8nm layers of In0.23Ga0.77As in GaAs shows promising characteristics with regard to the total dipole strength which can be coupled to the field mode.
http://hdl.handle.net/2262/49586
Marked
Mark
Structural distortions and model Hamiltonian parameters: From LSDA to a tight-binding description of LaMn O3
(2007)
EDERER, CLAUDE
Structural distortions and model Hamiltonian parameters: From LSDA to a tight-binding description of LaMn O3
(2007)
EDERER, CLAUDE
Abstract:
peer-reviewed
The physics of manganites is often described within an effective two-band tight-binding #1;TB#2; model for the Mn eg electrons, which apart from the kinetic energy includes also a local ?Hund?s rule? coupling to the t2g core spin and a local coupling to the Jahn-Teller #1;JT#2; distortion of the oxygen octahedra. We test the validity of this model by comparing the energy dispersion calculated for the TB model with the full Kohn-Sham band structure calculated within the local spin-density approximation #1;LSDA#2; to density functional theory. We analyze the effect of magnetic order, JT distortions, and ?GdFeO3-type? tilt rotations of the oxygen octahedra. We show that the hopping amplitudes are independent of magnetic order and JT distortions and that both effects can be described with a consistent set of model parameters if hopping between both nearest and next-nearest neighbors is taken into account. We determine a full set of model parameters from the density fun...
http://hdl.handle.net/2262/31371
Marked
Mark
Exposition of semiconducting and ferromagnetic properties of pulsed-laser-deposited thin films of LaFe1-xNixO3 (x=0.3, 0.4, and 0.5)
(2005)
SHVETS, IGOR; ARORA, SUNIL KUMAR
Exposition of semiconducting and ferromagnetic properties of pulsed-laser-deposited thin films of LaFe1-xNixO3 (x=0.3, 0.4, and 0.5)
(2005)
SHVETS, IGOR; ARORA, SUNIL KUMAR
Abstract:
We have explored the possibility of ferromagnetic semiconducting property in the epitaxial thin films of LaFe1?xNixO3 x=0.3, 0.4, and 0.5 grown on 001 oriented LaAlO3 substrate. We observe that substitution of Ni in the series leads to the increase in conductivity of the samples with conduction being controlled by the disorder-induced localization of charge carriers. All these samples show ferromagnetic behavior at room temperature while their magnetization decreases with increase in Ni concentration in the composition. The results have been explained on the basis of the close interplay between the electrical and magnetic properties.
http://hdl.handle.net/2262/40393
Marked
Mark
Chemical bonding in copper-based transparent conducting oxides: CuMO(2) (M = In, Ga, Sc)
(2011)
SCANLON, DAVID; ALLEN, JEREMY; WATSON, GRAEME WILLIAM; GODINHO, KATHERINE GITANJALI
Chemical bonding in copper-based transparent conducting oxides: CuMO(2) (M = In, Ga, Sc)
(2011)
SCANLON, DAVID; ALLEN, JEREMY; WATSON, GRAEME WILLIAM; GODINHO, KATHERINE GITANJALI
Abstract:
The geometry and electronic structure of copper-based p-type delafossite transparent conducting oxides, CuMO(2) (M = In, Ga, Sc), are studied using the generalized gradient approximation (GGA) corrected for on-site Coulomb interactions (GGA + U). The bonding and valence band compositions of these materials are investigated, and the origins of changes in the valence band features between group 3 and group 13 cations are discussed. Analysis of the effective masses at the valence and conduction band edge explains the experimentally reported conductivity trends.
http://hdl.handle.net/2262/59411
Marked
Mark
Microtexture of magnetite thin films of (001) and (111) orientations on MgO substrates studied by electron-backscatter diffraction
(2008)
MURPHY, SHANE; ARORA, SUNIL KUMAR; SHVETS, IGOR
Microtexture of magnetite thin films of (001) and (111) orientations on MgO substrates studied by electron-backscatter diffraction
(2008)
MURPHY, SHANE; ARORA, SUNIL KUMAR; SHVETS, IGOR
Abstract:
The grain orientation of (001)- and (111)-oriented magnetite thin films grown on MgO substrates (film thickness of 100?400?nm) is analyzed by means of the electron-backscatter diffraction (EBSD) technique. The (001) surface after a short annealing in air (1?min, 250??C) is characterized by the presence of tiny (diameter of 100?200?nm) misoriented islands, which have an influence on the antiferromagnetic coupling within the film. In the (111)-oriented films, such defects are found to be absent, and the films show a very homogeneous surface. The achieved spatial resolution enables further a cross-section analysis of a 400-nm-thick film with (001) orientation, even close to the interface MgO-magnetite.
http://hdl.handle.net/2262/40322
Marked
Mark
Structural and transport properties of Bi-substituted Co2MnO4
(2009)
ARORA, SUNIL KUMAR; SHVETS, IGOR
Structural and transport properties of Bi-substituted Co2MnO4
(2009)
ARORA, SUNIL KUMAR; SHVETS, IGOR
Abstract:
We report the structural and transport properties of the Bi-substituted Co2MnO4 multiferroic materials. Samples synthesized using the solid state reaction route with the composition BixCo2?xMnO4 (<0x<0.3) exhibit a single phase behavior with a cubic spinel structure (space group Fd3m). The lattice parameter was found to increase with the Bi substitution. The dc-conductivity studies reveal that all the samples possess a semiconducting behavior. The resistivity was found to decrease with the increase in the Bi substitution. The dc- as well as ac-conductivity data were analyzed in the light of various conduction models. The dc-conductivity data are explained using the variable range hopping model. The ac conductivity calculated from the dielectric data as a function of temperature and frequency demonstrates the cross over from small polaron tunneling to correlated barrier hopping type conduction in these materials.
http://hdl.handle.net/2262/40472
Marked
Mark
Investigation of the physical mechanisms of shear-force imaging
(1996)
SHVETS, IGOR
Investigation of the physical mechanisms of shear-force imaging
(1996)
SHVETS, IGOR
Abstract:
It is shown that shear-force imaging, as is commonly used for distance regulation in scanning near-field optical microscopy, is not a reliable technique for accurate topographic measurements. This is because different materials experience different shear-force damping. Results of the shear-force damping characteristics are presented for a number of different materials, and some consequences of the different dampings for different materials are demonstrated. It is also shown that there are at least two distinct shear force damping mechanisms. Results of imaging small conducting islands on a glass substrate show that the damping characteristics depend on the islands' size.
http://hdl.handle.net/2262/40476
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Mark
Toying with physics
(2007)
HUTZLER, STEFAN; WEAIRE, DENIS LAWRENCE
Toying with physics
(2007)
HUTZLER, STEFAN; WEAIRE, DENIS LAWRENCE
Abstract:
In the early 19th century the popularisation of science became a vogue, expressed in books that often took the form of ?conversations on natural philosophy?. They may have echoed the discourse of the classical dialogue of debate but this was more the conversation of the drawing-room, albeit in the stilted parlance of the time
http://hdl.handle.net/2262/41089
Marked
Mark
Molecular dynamics of iso-amyl bromide by dielectric spectroscopy, and the effects of a nonpolar solvent, 2-methylpentane, on the spectral features
(1999)
VIJ, JAGDISH KUMAR
Molecular dynamics of iso-amyl bromide by dielectric spectroscopy, and the effects of a nonpolar solvent, 2-methylpentane, on the spectral features
(1999)
VIJ, JAGDISH KUMAR
Abstract:
To gain insight into the effects of the weakening of the electrostatic interactions on molecular dynamics when polar molecules are dissolved in a nonpolar solvent, the dielectric polarization and relaxation behaviors of iso-amylbromide and its 50 mol% solution in 2-methylpentane have been studied in detail over the frequency range, 1 mHz?1 MHz, and a temperature range approaching their liquid to glass transition. Features of the ~i! a-relaxation spectrum, ~ii! the Johari?Goldstein relaxation process in the liquid state at low temperatures, with an asymmetric spectral shape, and ~iii! the temperature dependence of the relaxation dynamics have been determined and the effects of weakening of the electrostatic interaction on these features examined. The high-frequency wing of the loss spectrum of the a-relaxation is proportional to v2b. The dynamics of its a-relaxation follows the Arrhenius equation initially at high temperatures and thereafter the Vogel?Fulcher? Tamman equation. Altern...
http://hdl.handle.net/2262/40558
Marked
Mark
Planar Hall effect in magnetite (100) films
(2006)
SHVETS, IGOR
Planar Hall effect in magnetite (100) films
(2006)
SHVETS, IGOR
Abstract:
peer-reviewed
Giant planar Hall effect (GPHE) has been observed in epitaxial magnetite (100) films grown on MgO substrates. The effect is manifested as jumps in the transverse resistivity when the film is subjected to a swept, in-plane magnetic field. The jumps are two orders of magnitude higher than previously observed in metallic ferromagnets. Recently, the same effect has been reported for other materials, but unlike our results, they present GPHE at low temperature only. The magnitude of the GPHE observed at room temperature has potential applications such as magnetic sensors and nonvolatile memory elements.
http://hdl.handle.net/2262/31771
Marked
Mark
Demonstration of high-brightness-mode propagation in a compound waveguide structure
(1999)
HEGARTY, JOHN
Demonstration of high-brightness-mode propagation in a compound waveguide structure
(1999)
HEGARTY, JOHN
Abstract:
We demonstrate the existence of an unusual and useful high-brightness guided mode of a multimode AlGaAs/GaAs heterostructure compound slab waveguide. This mode has a narrow near-field single lobe confined to the low-index regions of the waveguide. This mode was selectively probed by optically exciting quantum wells optimally placed in the waveguide. By pumping in a stripe geometry, lasing is observed above a threshold of 80 kW/cm2 indicating efficient lasing in the highest-order waveguide mode. The near-field emission pattern of the waveguide was imaged to provide a direct measurement of the intensity profile of the higher-order mode.
http://hdl.handle.net/2262/38050
Marked
Mark
SnO2 doped with Mn, Fe or Co: Room temperature dilute magnetic semiconductors
(2004)
VENKATESAN, MUNUSWAMY; COEY, JOHN MICHAEL DAVID
SnO2 doped with Mn, Fe or Co: Room temperature dilute magnetic semiconductors
(2004)
VENKATESAN, MUNUSWAMY; COEY, JOHN MICHAEL DAVID
Abstract:
peer-reviewed
Room temperature ferromagnetism is found in (Sn1?xMx)O2 (M=Mn, Fe, Co, x=0.05) ceramics where x-ray diffraction confirms the formation of a rutile-structure phase. Room temperature saturation magnetization of 0.2 and 1.8 Am2?kg?1 for (Sn0.95Mn0.05)O2 and (Sn0.95Fe0.05)O2, respectively, corresponds to a moment of 0.11 or 0.95??B per Mn or Fe atom. The Curie temperatures are 340 and 360 K, respectively. The magnetization cannot be attributed to any identified impurity phase. 57Fe Mossbauer spectra of the Fe-doped SnO2 samples, recorded at room temperature and 16 K, show that about 85% of the iron is in a magnetically ordered high spin Fe3+ state, the remainder being paramagnetic.
http://hdl.handle.net/2262/31829
Marked
Mark
Thick film permanent magnets by membrane electrodeposition
(2005)
COEY, JOHN MICHAEL DAVID
Thick film permanent magnets by membrane electrodeposition
(2005)
COEY, JOHN MICHAEL DAVID
Abstract:
peer-reviewed
Thick films of nearly equiatomic Co?Pt produced by electrodeposition into nanoporous membranes exhibit an isotropic magnetic phase with square hysteresis loops (Mr/Ms = 0.95) and coercivity of up to 1.3 T. The initial magnetization curve is characteristic of pinning-type magnets. The coercivity can be controlled by the choice of annealing temperature or alloy composition, which depends on the chemical composition of the plating bath, properties which can be exploited to produce fine-pitch pole patterns.
http://hdl.handle.net/2262/31833
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