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  • 1
    ISSN: 1432-0630
    Keywords: 75.60.Jp ; 81.35.+k ; 68.55.Bg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A series of Co x Ag1−x (0 ≤x 〈 100 at.%) granular films were deposited onto glass substrates with the thickness on the order of 400 nm using the ion-beam cosputtering technique at different substrate temperatures. Systematical investigations were made on the Giant MagnetoResistance (GMR) effect and microstructures in these thin granular films. The magnetoresistance ratio strongly depends on cobalt concentration, substrate temperature, and the optimal value of GMR was observed in Co22Ag78 sample prepared at a temperature of 300 K. Microstructures of these films are closely related to the fabricating process, and thus influence the GMR.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Nuclear Physics, Section A 520 (1990), S. c241-c250 
    ISSN: 0375-9474
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Spectrochimica Acta Part B: Atomic Spectroscopy 49 (1994), S. 89-103 
    ISSN: 0584-8547
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 3668-3670 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A thin (∼2 nm thick) amorphous diamond coating was prepared on single crystal silicon tip arrays by using a filtered vacuum arc plasma deposition technique. The coating has a microscopically uniform morphology. As compared to uncoated tips, the electron emission of the coated tip arrays is enhanced, showing an increase in the total current, lower turn-on field and a lower-slope Fowler–Nordheim plot. We propose that field-emitted electrons could tunnel through such a thin coating with few scattering events. It is shown that the low potential barrier at the interface is the major cause of the enhancing effects instead of the negative surface electron affinity of the coating. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 25-29 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present an analysis of the steady state optical response of two-dimensional optical superlattices with Kerr nonlinearity. We consider the effects of the modification of the refractive index modulation strengths in the superlattices and the angular deviation of incoming radiation from Bragg conditions. We find that under Bragg incidence the system displays optical bistability only when the modulation ratio exceeds a certain threshold. We also predict that optical bistability can disappear under non-Bragg incidence. Physical considerations are presented and discussed on how to optimize the chances for observing optical bistability in such a superlattice. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 4446-4447 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Diamond films were deposited on ZnO:Al thin-film silica substrates by hot-filament chemical vapor deposition. Ultrasonic irradiation in a diamond suspension enhanced the diamond nucleation density on a ZnO:Al-silica substrate. The nucleation density and the growth rate of diamond film deposited on ZnO:Al thin film is higher than on the silica. The cracks on a ZnO:Al-silica substrate occurred during the diamond deposition process. It is proposed that the cracks were caused by the stress in ZnO:Al film and diamond film, and the peak frequency shift of the Raman line of diamond indicates the presence of compressive stress in the diamond film.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 5594-5597 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Intense pulsed electron beams with power densities of ∼109 W/cm2 were used to evaporate solid targets of ZrO2 and pure Zr. The deposition was carried out in an environment of O2 gas of 10 Pa. The high-temperature plasma generated by intense pulsed electron beam contains energetic ions of target material and environmental gas O2. This ion flux vertical to and 2–4 mm away from the target was about 1014/cm2 per electron pulse for above power densities. The Raman spectra of ZrO2 thin films deposited on Si substrates by this technique showed their forms to consist of monoclinic, tetragonal, and cubic phases. Transmission electron microscope images showed that the ZrO2 films are even and dense, and corresponding diffraction patterns of the ZrO2 films revealed that the ZrO2 films have the microcrystalline structures in the forms of monoclinic and cubic phases.
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  • 8
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 1323-1325 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A field-induced electron emission phenomenon has been observed from nitrogen-doped diamond films deposited on molybdenum substrates by microwave plasma enhanced chemical vapor deposition using N2/CH4 as feedstock. Their field-induced electron emission characteristics, i.e., current–voltage characteristics and distribution of emission sites, were studied using the transparent anode imaging technique. A repeatable abrupt change of "on" and "off" states of emission was observed at two corresponding specific fields during circling of both increasing and decreasing applied gap fields. A plausible explanation is given to this type of field-induced electron emission phenomenon, in which a two-layer structure consisting of amorphous carbon and diamond is proposed. © 1999 American Institute of Physics.
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  • 9
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 2383-2385 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An analysis is carried out of the physical origin of thermal instability that can trigger a catastrophic vacuum breakdown event in vacuum microelectronic devices based on flat diamond emitters. The temperature rise in a diamond film will enhance internal field emission across metal–diamond interface. This effect can lead to a regenerative process that can initiate a breakdown event at temperature lower than the melting point of an emitter. A set of equations has been developed. These theoretical findings are successfully applied to explain the instability of field emission from the nondoped diamond films. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 3651-3653 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nanodiamond powder was annealed at each of the following temperatures: 300, 600, 800, 1000, and 1150 °C, for an hour in flowing argon ambient. The variations of x-ray diffraction patterns and Raman spectra of the powder with different annealing temperatures were studied. While being annealed at temperatures higher than 800 °C, the powder can undergo a phase-transition process from cubic diamond to graphite. In addition, the size of nanodiamond crystallites decreased from ∼50 to ∼25 Å. The physical mechanism responsible for the variation in Raman spectra is discussed using a phonon-confinement model. © 1999 American Institute of Physics.
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