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  • Electronic Resource  (151)
  • 1990-1994  (82)
  • 1985-1989  (69)
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  • Electronic Resource  (151)
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  • 1
    Electronic Resource
    Electronic Resource
    Domain structure of as-cast and annealed FeSiB amorphous wires : 35th annual conference on magnetism and magnetic materials San Diego, California (USA) 29 Oct − 1 Nov 1990 (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5331-5333 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The domain structures of amorphous FeSiB wires have been studied as a function of applied field. The main features of as-cast wires are: the proliferation of surface closure domains; a distinction between core and sheath domain behavior; and a reproducible switching behavior. Transverse magnetically annealed wires have larger domains, show little sign of a sheath and a greater variety of domain displacement mechanisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348069
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  • 2
    Electronic Resource
    Electronic Resource
    Low-frequency measurements of cyclotron resonance in a high-mobility 2D electron gas in GaAs/AlGaAs heterostructures (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 4736-4738 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Cyclotron resonance in GaAs/AlGaAs heterostructures, containing a high-mobility two-dimensional electron gas (2DEG), has been investigated with the help of a resonator technique over the frequency range 26–34 GHz. Heterostructures with mobilities from 2×105 to 1.6×106 cm2/V s have been measured. The microwave conductivity of the 2DEG is well described by the Drude model and momentum relaxation time values are found to be close to dc values. The cyclotron mass was found to be 0.068±0.002m0.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352081
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  • 3
    Electronic Resource
    Electronic Resource
    Plasmon excitation and self-coupling in a bi-periodically modulated two-dimensional electron gas (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 6049-6061 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report far infrared (FIR) studies of plasmons in spatially modulated two-dimensional electron gases (2DEGs) in AlGaAs/GaAs heterostructures using biased overlaid metal gratings, including interdigitated gratings, both as optical couplers and as spatially modulating gates. Comparison of the experimental results with the predictions of scattering matrix calculations of the FIR response of a modulated 2DEG in the presence of a perfectly conducting lamellar grating allow us to deduce the spatial variation of the number density distribution in the 2DEG as a function of grating bias. For the interdigitated grating gates, the 2DEG can be modulated at a period of twice that of the grating fingers by differentially biasing alternate fingers; 2D plasmon resonances have been observed at half-integral values of the grating wave vector G, corresponding to the electrically induced periodicity of the 2DEG modulation itself acting as an optical coupler in addition to the metal grating. The observed G/2 plasmon frequencies decrease with increasing amplitude of the 2DEG number density modulation, in quantitative agreement with those obtained from scattering matrix calculations of the optical response of a modulated 2DEG under a perfectly conducting lamellar grating; calculations of the oscillating charge density profiles show that this occurs because, as the modulation amplitude increases, the oscillation becomes localized in regions of low 2DEG number density which are also under one of the sets of grating fingers, and is therefore better screened.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350462
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  • 4
    Electronic Resource
    Electronic Resource
    Site-selective laser spectroscopy of deuterated SrF2:Er3+ (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 2166-2177 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Laser selective excitation and optical absorption of deuterated SrF2:0.05% Er3+ crystals have revealed eight Er3+ ion centers involving D− ion charge compensation, nine new Er3+–F− centers not associated with D− ions and several approximately cubic symmetry Er3+ centers. In contrast to the trigonal symmetry of the principal F− center, the dominant arrangements in the D− ion charge compensation case are derived from a tetragonal symmetry center. Detailed spectroscopic results for the new centers are presented. Fluorescence polarization ratios are listed for three centers ( J, B, and G1) present in either SrF2:Er3+ or CaF2:Er3+ and crystal-field analyses of these, based on assumed trigonal symmetry, are also reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458008
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  • 5
    Electronic Resource
    Electronic Resource
    Reviews (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Government and opposition 21 (1986), S. 0 
    Details
    ISSN: 1477-7053
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Political Science
    Notes: Book Reviewed in this article:Crisis Behaviour TheoryComparing Welfare OrientationsTaking Politics out of IdeologyA Sceptical Look at Select CommitteesDemocratic SensibilityHistory as Progress or Decay?Analysing Psychoanalysis
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1477-7053.1986.tb01119.x
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  • 6
    Electronic Resource
    Electronic Resource
    Paramoeba invadens n. sp. (Amoebida, Paramoebidae), a Pathogenic Amoeba from the Sea Urchin, Strongylocentrotus droebachiensis, in Eastern Canada (1985)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 32 (1985), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Paramoeba invadens n. sp. is described from sea urchin tissues and from culture. Amoebae are 20–40 μm in length with an irregular hyaline region producing short subpseudopodia. One parasome per cell is present. The parasome is bipolar with basophilic, Feulgen-positive poles and a Feulgen-negative median segment. The fine structure of the parasome resembles those in other species of Paramoeba and the surface of the amoeba is plain with no hairs or scales. Amoebae dislodged from tissues often adopt a semifloating form; floating forms have been seen in culture. Amoebae circulate within lumina of the water vascular system and can migrate readily into or out of tissues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1985.tb03075.x
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  • 7
    Electronic Resource
    Electronic Resource
    Raman studies of plasmon modes in a drifting two-dimensional electron gas (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 1701-1705 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present the first Raman-scattering studies of the behavior of the intrasubband plasmon mode of a two-dimensional electron gas which is undergoing lateral drift in an applied electric field. The data clearly show the expected Doppler shifts of the modes traveling up- and downstream, together with the expected dependence on the wave vector, but at higher drift velocities, the expected linear shift is distorted because of electron heating effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357684
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  • 8
    Electronic Resource
    Electronic Resource
    Electrostatically defined heterojunction rings and the Aharonov–Bohm effect (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 21-23 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Micron-sized loops of high-mobility two-dimensional electron gas have been made on GaAs-AlGaAs heterostructures using a novel split-gate technique. Aharonov–Bohm oscillations of amplitude up to 20% of the device resistance have been observed at very low temperatures (T〈100 mK), together with h/2e oscillations which appear to be due to interference between pairs of time-reversed paths near B=0. The h/e period is found to vary by ∼25% with magnetic field, possibly as a result of the formation of edge states. In the quantum Hall effect, plateaus in Rxx are seen at high B due to variations in carrier concentration across the ring, which may cause backscattering of some edge states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100818
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  • 9
    Electronic Resource
    Electronic Resource
    Growth and microstructure of Bi-Sr-Ca-Cu-O thin films (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 429-431 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin superconducting Bi-Sr-Ca-Cu-O films have been grown by reactive magnetron sputtering with an average cation ratio of 2:2:1:2 on single-crystal (100)MgO. Films show a superconducting transition onset at 117 K, but do not go to zero resistance until 83–84 K. Secondary electron microscopy and electron beam microprobe showed two major phases with different compositions and morphologies. The dominant phase was a lamellar phase with composition very close to the 2:2:1:2 cation ratio. The second phase had a needle-like morphology, which was deficient in Bi, and had excess Cu. The nonsuperconducting Sr14−xCaxCu24O41 phase had been known to exist in bulk; therefore, the needle phase could be an intermediate step in the formation of Sr14−xCaxCu24O41 phase as Bi deficiency in the needles increased with increasing annealing temperature and/or time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100671
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  • 10
    Electronic Resource
    Electronic Resource
    Stability of Te–Cu amorphous alloy thin films for optical recording (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 1671-1678 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied the structure and optical stability of Te–Cu thin film alloy candidates for write-once optical recording. Films prepared by rf diode sputtering with 20–50 at. % Cu are amorphous, as-sputtered. One of these, Te65 Cu35 , has a relatively high crystallization temperature (150 °C), as determined by x-ray diffraction. Near the eutectic composition (∼29 at .% Cu), alloy films have stable optical properties after accelerated aging at 60 °C and 85% relative humidity. The mechanism for film stability near the eutectic was studied by x-ray photoelectron spectroscopy and depth profiling using ion scattering spectroscopy. We found that a Cu-enriched surface oxide, formed at ambient conditions, passivates the film and is responsible for its subsequent stability after accelerated aging. We also demonstrated that a 14 in. diam, multilayer optical disk with a Te65 Cu35 recording medium exhibits excellent linearity for 3 and 8 MHz pulses, good written pulse length stability, and high signal-to-noise ratio. Thus, a Te–Cu recording medium can effectively use run-length-limited codes, which allow very high data storage capacity and data transfer rates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341787
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