| | Creator | Title | Description | Subject | Date |
|---|
| 1 |  | Saam, Brian | 3He spin exchange cells for magnetic resonance imaging | We present a protocol for the consistent fabrication of glass cells to provide hyperpolarized (HP) 3He for pulmonary magnetic resonance imaging. The method for producing HP 3He is spin-exchange optical pumping. The valved cells must hold of order 1 atm.L of gas at up to 15 atm pressure. Because char... | 3He; Spin exchange cells; Hyperpolarized 3He; Pulmonary magnetic resonance imaging; Spin-exchange optical pumping; SEOP; Glass cells | 2002 |
| 2 |  | Symko, Orest George | Absorption at radio frequencies in superconducting Y1Ba2Cu3Oy | The large magnetic-field-dependent ac absorption in superconducting Y1Ba2Cu3Oy ceramics and powders decreases slowly with increasing frequency in the range 2-16 MHz. The magnetic-field-dependent ac absorption is observed below Tc in superconducting Y1Ba2Cu3Oy ceramics, powders and twinned crystals ... | Copper-octahedral oxygen perovskites; Superconducting Y1Ba 2Cu3Oy; ac absorption | 1989 |
| 3 |  | Miller, Joel Steven; Epstein, Arthur J. | Anomalous magnetoresistance in high-temperature organic-based magnetic seminconducting V(TCNE)x films | Anomalous positive magnetoresistance (MR) in high temperature organic-based magnet V(TCNE)x (TCNE=tetracynoethylene) thin films is reported. MR increases linearly with applied magnetic field and shows a maximum at the ferrimagnetic ordering temperature. The suggested roles of oppositely spin pola... | Spin; Ferrimagnetic; Resistance | 2003 |
| 4 |  | Williams, Clayton C. | Atomic force microscope-force mapping and profiling on a sub 100-Å scale | A modified version of the atomic force microscope is introduced that enables a precise measurement of the force between a tip and a sample over a tip-sample distance range of 30-150Å. As an application, the force signal is used to maintain the tip-sample spacing constant, so that profiling can be ... | Attractive force; Silicon wafer | 1987 |
| 5 |  | Mattis, Daniel C. | Band theory of ferromagnetism, antiferromagnetism, and spin waves | Intra-atomic exchange (Hund's rule mechanism) and Heisenberg nearest-neighbor exchange are examined for their role in the ferromagnetism of metals with degenerate bands. The equations of motion of spin waves valid near T=0°K are derived, and a number of branches are found. When the equations are ... | Orbital degeneracy; Indirect exchange theory; Band theory | 1964 |
| 6 |  | Golden, Kenneth M. | Bounds on the complex permittivity of matrix-particle composites | The complex effective dielectric constant E* of matrix-particle composites is considered. Such composites consist of separated inclusions of material of type one embedded in a matrix of material of type two. The analytic continuation method is used to derive a series of bounds which incorporate a n... | Random; Parameters; Continuation | 1995 |
| 7 |  | Miller, Joel Steven | Cluster glass state and photoinduced effects on the freezing dynamics in KxCo[Fe(CN)6]y.ZH2O (x-0.16,y-0.72, z-4.4) | The magnetic properties and photoinduced magnetization of a Prussian blue analog, KxCo[Fe(Cn)6]y•ZH2O (x-0.16, y-0.72, z-4.4) were systematically studied. The frequency dependence of the linear ac susceptibility, the irreversibility in the field-cooled/ zero-field-cooled magnetization (MFC /MZFC)... | Hexacyanide; Illumination; Temperatures | 2000 |
| 8 |  | Symko, Orest George | Discrete spatial filtering with SQUID gradiometers in biomagnetism | First-, second-, and third-order gradiometers used in detecting biomagnetic signals are analyzed as spatial niters. Their transfer functions independent of the source to be measured are presented and both the magnitude and phase characteristics of the transfer functions are analyzed. The distortion ... | Spatial filtering; SQUID gradiometers; Fourier transform | 1986 |
| 9 |  | Symko, Orest George | Effect of RKKY interactions on the magnetization of dilute magnetic alloys with hcp hosts | The magnetization due to the presence of magnetic impurities dissolved dilutely in nonmagnetic H.C.P. host metals has been calculated assuming a fine structure splitting by an axially symmetric crystal field and an RKKY interaction between the impurities. To compute the RKKY contribution, the inte... | RKKY interactions; Dilute magnetic alloys; HCP hosts; MgMn; ZnMn | 1981 |
| 10 |  | Liu, Feng | Effect of size and dimensionality on the magnetic moment of transition metals | The effect of size and dimensionality on the magnetic moments of Fe, Co, and Ni have been studied theoretically by confining the atoms t o various structural forms such as chains,surfaces, and thin films. The size of these systems is controlled by limiting t h e number of atoms. A new first-princip... | Magnetic moment; Dimensionality; Size effects; Fe; Co; Ni | 1990 |
| 11 |  | Stringfellow, Gerald B.; Rieth, Loren W. | Effects of Br and Cl on organometallic vapor phase epitaxial growth and ordering in GaInP | CuPt ordering in GaInP has significant effects on the electrical and optical properties. In fact, band gap reductions as large as 160 meV are potentially useful for devices. Thus, control of ordering is important. This has led to the investigation of surfactants that affect the surface processes d... | Band gap reductions; Surfactants; Surface processes | 2004 |
| 12 |  | Stringfellow, Gerald B. | Effects of low surfactant Sb coverage on Zn and C incorporation in GaP | The use of surfactants during the vapor phase growth of III-V materials to control fundamental characteristics of epitaxial layers is becoming increasingly important. We have investigated the remarkable effects of Sb, from triethylantimony (TESb) Pyrolysis, on the Zn doping during the organometallic... | Surfactants; Organometallic vapor phase epitaxy; Gallium phosphide | 2007 |
| 13 |  | Vardeny, Zeev Valentine | Electrical and optical studies of gap states in self-assembled molecular aggregates | We fabricated a variety of two-terminal devices using self-assembled monolayers (SAM) of solid-state mixtures comprised of molecular "wires" [1,4-methane-benzenedithiol (Me-BDT)] and molecular insulator "spacers" [1-pentanethiol], which were prepared at various molar concentrations ratio, r of wires... | Gap states; Self-assembled molecular aggregates | 2007 |
| 14 |  | Tiwari, Ashutosh | Electrical properties of transparent and conducting Ga doped ZnO | In this paper, we report on the metal-semiconductor transition behavior observed in transparent and conducting ZnO:Ga films grown by pulsed-laser deposition. The electrical resistivity measurements were carried out on ZnO films with varying Ga concentration in the temperature range of 14 to 300 K. ... | Transparent conducting oxides; ZnO; Gallium; Metallic conductivity | 2006 |
| 15 |  | Tiwari, Ashutosh | Electrical transport in ZnO1-δ films: transition from band-gap insulator to Anderson localized insulator | We have thoroughly investigated the effect of oxygen nonstoichiometry on the electrical transport characteristics of ZnO1−δ films. These films were grown on optical grade quartz substrates by using a pulsed laser deposition technique. In order to alter the amount of oxygen nonstoichiometry (δ), ... | Anderson localized insulators | 2004 |
| 16 |  | Tiwari, Ashutosh | Epitaxial growth and properties of MoOx(2 | We report the growth of epitaxial molybdenum oxide (MoOx,2<x<2.75) films on c plane of sapphire substrate using pulsed laser deposition in oxygen environment. The structure was characterized using x-ray diffraction, high resolution transmission electron microscopy and x-ray photoelectron spectroscop... | Epitaxy; MoO | 2005 |
| 17 |  | Miller, Joel Steven; Epstein, Arthur J. | Ferromagnetism in molecular materials: decamethylferrocenium tetracyanoethanide [DMeFc][TCNE] (invited) | Ferromagnetism has only recently been observed in molecular materials. We present here a summary of the ferromagnetic phenomena observed in the molecular charge transfer salt, decamethylferrocenium tetracyanoethanide (DMeFc) (TCNE), and related compounds. A spontaneous magnetization is observed i... | Magnetic; Magnetization | 1988 |
| 18 |  | Liu, Feng | First-principles calculation of interaction between interstitial O and As dopant in heavily As-doped Si | We investigate the interaction between interstitial oxygen (Oi) and As dopant in heavily As-doped Si using first-principles total-energy calculations. The interaction between Oi and As (substitutional) is found to be short ranged. The most stable configuration is with As and Oi as second nearest nei... | First-principles calculation; Interstitial oxygen; As dopant; As-doped Si; Oxygen diffusion; Oi | 2007 |
| 19 |  | Tiwari, Ashutosh | Formation of self-assembled epitaxial nickel nanostructures | Highly orientated nickel magnetic nanoparticles were obtained by pulsed laser deposition technique on silicon (100) substrate using epitaxial titanium nitride film as the template. These nanoparticles have been characterized by conventional and high-resolution transmission electron microscopy, scann... | TiN; Nickel | 2003 |
| 20 |  | Boehme, Christoph | H loss mechanism during anneal of silicon nitride: chemical dissociation | Remote plasma enhanced chemical vapor deposited silicon nitride (SixNyHz), produced at high ammonia to silane flow rates (ammonia rich) shows a reduction of hydrogen during rapid thermal anneal at temperatures that exceed the deposition temperature. This H release could be either due to a ‘‘slow... | Anneal | 2000 |
| 21 |  | Stringfellow, Gerald B. | Influence of Sb, Bi, Tl, and B on the incorporation of N in GaAs | GaAs:N is an interesting material for many devices due to its unique compositional variation of band gap. Small amounts of N lead to a strong decrease in band gap energy as well as lattice constant. The further addition of In or Sb leads to quaternary alloys with band gap energies below 1.4 eV latti... | Antimony; Gallium Arsenide; Nitrogen | 2002 |
| 22 |  | Stringfellow, Gerald B. | Kinetics of Te doping in disordering GaInP grown by organometallic vapor phase epitaxy | Te-doped GaInP epitaxial layers were grown by organometallic vapor phase epitaxy in an effort to clarify the Te disordering mechanism. CuPt ordered GaInP is produced under normal growth conditions. The addition of Te has been reported to induce disorder. One suggested mechanism for disordering GaInP... | Crystal growth; Epitaxy; Dynamics | 2001 |
| 23 |  | Symko, Orest George | Magnetic anisotropy of Zn-Cr alloys at very low temperatures | The temperature dependent magnetization of Zn-Cr single crystals was measured from 2K down to 10 mK using a SQUID magnetometer. A large anisotropy is observed for the magnetization along the parallel and perpendicular axes of the crystal. For low concentrations impurity-impurity reactions do not do... | Magnetic anisotropy; Zn-Cr alloys; Temperature dependent magnetization | 1978 |
| 24 |  | Symko, Orest George | Magnetic memory of oil paintings | The color in oil paints is obtained sometimes from magnetic minerals. This fact implies that oil paintings could present an intrinsic magnetization. Magnetic imaging of an oil painting consists in the measurement of magnetic flux related to the magnetization of the painting. In this report results o... | Magnetic memory; Oil paintings; Authentication | 2007 |
| 25 |  | Symko, Orest George | Magnetic shielding and relaxation characteristics of superconducting YBa2Cu3O7 tubes | High-7c superconducting tubes have been developed for magnetic shielding of SQUIDs at 77 K. The characteristics of such tubes show that adequate shielding exists for magnetic fields up to a critical field determined by the current density of the tube. Relaxation phenomena with two different time de... | YBa2Cu3O7 tubes; High-Tc; SQUID | 1989 |
