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  • 1
    Electronic Resource
    Electronic Resource
    Optically controlled resonant tunneling in a double-barrier diode (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 3384-3386 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The resonant tunneling effect is optically enhanced in a GaAs/GaAlAs double-barrier structure that has partial lateral current confinement. The peak current increases and the valley current decreases simultaneously when the device surface is illuminated, due to the increased conductivity of the top layer of the structure. The effect of the lateral current confinement on the current-voltage characteristic of a double-barrier resonant tunneling structure was also studied. With increased lateral current confinement, the peak and valley current decrease at a different rate such that the current peak-to-valley ratio increases up to three times. The experimental results are explained by solving the electrostatic potential distribution in the structure using a simple three-layer model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348515
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  • 2
    Electronic Resource
    Electronic Resource
    Added discussion of "Observations of fast anisotropic ion heating, ion cooling, and ion recycling in large-amplitude drift waves" (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 4118-4119 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A recent paper [S. J. Sanders, P. M. Bellan, and R. A. Stern, Phys. Plasmas 5, 716, (1998)] identified neutral particle recycling as one important aspect of severe heating and cooling cycles observed in large-amplitude drift waves. An apparent inconsistency in the ionization mean free path of these neutrals, left as an open question in the original paper, is resolved in this comment. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873675
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  • 3
    Electronic Resource
    Electronic Resource
    Observations of fast anisotropic ion heating, ion cooling, and ion recycling in large-amplitude drift waves (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 716-728 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Large-amplitude drift wave fluctuations are observed to cause severe ion temperature oscillations in plasmas of the Caltech Encore tokamak [J. M. McChesney, P. M. Bellan, and R. A. Stern, Phys. Fluids B 3, 3370 (1991)]. Experimental investigations of the complete ion dynamical behavior in these waves are presented. The wave electric field excites stochastic ion orbits in the plane normal (⊥) to B, resulting in rapid ⊥ heating. Ion–ion collisions impart energy along ((parallel)) B, relaxing the ⊥-(parallel) temperature anisotropy. Hot ions with large orbit radii escape confinement, reaching the chamber wall and cooling the distribution. Cold ions from the plasma edge convect back into the plasma (i.e., recycle), causing further cooling and significantly replenishing the density depleted by orbit losses. The ion–ion collision period τii∼T3/2/n fluctuates strongly with the drift wave phase, due to intense ((approximate)50%) fluctuations in n and T. Evidence for particle recycling is given by observations of bimodal ion velocity distributions near the plasma edge, indicating the presence of cold ions (0.4 eV) superposed atop the hot (4–8 eV) plasma background. These appear periodically, synchronous with the drift wave phase at which ion fluid flow from the wall toward the plasma center peaks. Evidence is presented that such a periodic heat/loss/recycle/cool process is expected in plasmas with strong stochastic heating. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872758
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  • 4
    Electronic Resource
    Electronic Resource
    Real-time phase-selective data acquisition system for measurement of wave phenomena in pulsed plasma discharges (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 2027-2031 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A novel data acquisition system and methodology have been developed for the study of wave phenomena in pulsed plasma discharges. The method effectively reduces experimental uncertainty due to shot-to-shot fluctuations in high repetition rate experiments. Real-time analysis of each wave form allows classification of discharges by wave amplitude, phase, or other features. Measurements can then be constructed from subsets of discharges having similar wave properties. The method clarifies the trade-offs between experimental uncertainty reduction and increased demand for data storage capacity and acquisition time. Finally, this data acquisition system is simple to implement and requires relatively little equipment: only a wave form digitizer and a moderately fast computer. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148893
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  • 5
    Electronic Resource
    Electronic Resource
    Size effects and giant magnetoresistance in unannealed NiFe/Ag multilayer stripes : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6240-6242 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have observed giant magnetoresistance (GMR) in unannealed NiFe/Ag multilayer thin-film stripes. Rectangular stripes having constant thickness and a constant 11:1 length-to-width aspect ratio, but varying widths down to 0.5 μm, were measured. Two types of multilayer configurations were tested, a system of five NiFe/Ag bilayers with 5.5-nm-thick Ag spacer layers, and a system of nine bilayers with 4.4-nm-thick Ag layers. In contrast to the characteristic of annealed NiFe/Ag multilayer stripes, the unnannealed stripes produced increasing GMR ratios for decreasing stripe sizes, with the 0.5-μm-wide stripe of the five-bilayer system exhibiting a ΔR/R of 2.5%. Barkhausen noise and response broadening also increased with decreasing stripe size, however. The results are discussed in terms of magnetostatic coupling of the NiFe layers within the stripes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362017
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  • 6
    Electronic Resource
    Electronic Resource
    Giant magnetoresistance and high sensitivity in annealed NiFeCo/Ag multilayers : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5584-5586 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report giant magnetoresistance in annealed NiFeCo (2 nm)/Ag (3.3 nm) multilayers. For all samples, post-deposition annealing was necessary for the observation of GMR analogous to the NiFe/Ag discontinuous multilayer system. The GMR ratio and field sensitivity varied widely as a function of annealing from temperatures between 300 and 400 °C. A high MR ratio of 6.3% and field sensitivity of 11.3%/(kA/m) (0.9%/Oe) were observed for a seven bilayer sample annealed to 350 °C. In general, NiFeCo/Ag multilayers produced greater MR responses and field sensitivities than comparably annealed NiFe/Ag multilayers. NiFeCo/Ag multilayers, however, display more hysteresis than NiFe/Ag multilayers and lack a zero-crossing saturation magnetostriction versus annealing temperature. Multilayer deposition in a magnetic field severely degrades MR performance since it prevents the magnetostatic antiparallel alignment between magnetic grains which occurs in the absence of an applied magnetic field following sample annealing. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362249
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  • 7
    Electronic Resource
    Electronic Resource
    Optical switching of a new middle trace in an optically controlled parallel resonant tunneling device−Observation and modeling (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 1548-1550 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Optical switching of a new middle trace observed in an optically controlled parallel resonant tunneling (OPT) device is demonstrated. A circuit model for the OPT is developed. The circuit model satisfactorily explains the existence of the middle trace and its optical switching.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105174
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  • 8
    Electronic Resource
    Electronic Resource
    Preparation of superconducting Bi-Sr-Ca-Cu-O fibers (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 292-294 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Procedures have been developed for the preparation of long slender fibers of Bi-Sr-Ca-Cu-O using a gas jet to shape and freeze the material. The fibers emerge in amorphous form and are converted to the Bi2Sr2Ca1Cu2Ox phase by subsequent heat treatment. Magnetization and scanning electron microscopy studies show the material to be a very fine grained bulk superconductor with intragranular critical currents of 7×106 A/cm2 at 5 K and 1.8 T.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102408
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of Al mole fraction on carrier diffusion lengths and lifetimes in AlxGa1−xAs (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 2622-2624 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The ambipolar diffusion length and carrier lifetime are measured in AlxGa1−xAs for several mole fractions in the interval 0〈x〈0.38. These parameters are found to have significantly higher values in the higher mole fraction samples. These increases are attributed to occupation of states in the indirect valleys, and supporting calculations are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101955
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  • 10
    Electronic Resource
    Electronic Resource
    Crystallization of amorphous Bi cuprate fibers to superconducting Bi2Sr2Ca1Cu2O8 (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 584-586 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The conversion of long slender filaments of Bi-based high-temperature superconductors from the amorphous to the crystalline phase has been studied in order to determine the suitability of these fibers for use in a multifilamentary magnet conductor. For very fine filaments, coarsening may be a problem, so special emphasis was placed on the optimum values of time and temperature used for recrystallization. Amorphous fibers approximately 1 μm in diameter can be crystallized to form granular filaments about 0.2 μm thick (in the c direction) and 3 to 4 μm wide. The c axis generally grows perpendicular to the long axis of the fiber.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103305
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