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  • 11
    Electronic Resource
    Electronic Resource
    Radiative leakage of space-charge waves by a modulated thin-sheet electron beam propagating parallel to a reflection grating (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 3543-3549 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A two-dimensional radiation by a modulated thin-sheet electron beam, which propagates parallel to a reflection grating composed of a slightly corrugated conducting surface, is investigated. The radiation can be interpreted as a radiative leakage of space-charge waves supported by the electron beam, when the effect of radiated fields back on the motion of electrons is taken into account. A self-consistent analysis of the leaky space-charge waves is presented using a perturbation approach based on the multiple-space scales. The coupled-wave equations governing the radiative leakage of space-charge waves are systematically derived. The analytical expressions for physical quantities characterizing the radiation are obtained in closed form. Numerical results of the leakage coefficient, the phase change due to the leakage, and the radiation efficiency are given for both of the fast and slow space-charge waves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339278
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  • 12
    Electronic Resource
    Electronic Resource
    High-energy conversion efficiency amorphous silicon solar cells by photochemical vapor deposition (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 3664-3666 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Hydrogenated amorphous silicon solar cells were fabricated by photochemical vapor deposition. A three-separate-chamber system was newly developed to reduce the contamination of the dopant elements as well as oxygen or water originated by the loading and unloading procedure. Wide optical band-gap hydrogenated amorphous silicon carbide was prepared using acetylene (C2H2) for the p layer. The deposition conditions for each layer were optimized and the highest-energy conversion efficiency of 9.64% was obtained. This high conversion efficiency was mainly attributed to the large short-circuit current which indicated that the quality of the i layer is reasonably good.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335724
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  • 13
    Electronic Resource
    Electronic Resource
    Effect of readout magnetic-field direction on trilayer magnetically induced super resolution media (abstract) : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 3838-3838 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Among the proposed magnetically induced super resolution media, double-mask rear aperture detection (RAD) has the greatest potential for use in high-density land/groove recording.1 We proposed a trilayer double-mask RAD media that does not require a large initializing magnetic field.2 In this paper, we report the land/groove recording on the trilayer media for a 0.4 μm mark length and 0.7 μm track pitch. We found that crosstalk drastically changed depending on the direction of the readout magnetic field, and that the crosswrite is related to crosstalk. When applying the readout magnetic field in the erasing direction, the value of crosstalk was about −25 dB and a large crosswrite effect was observed. Conversely, the crosstalk was below −45 dB and no crosswrite effect was observed when applying the magnetic field in the writing direction. CNRs had almost the same value of 48 dB for both the above cases. To investigate the mask formation while applying the readout field in the writing direction, we precisely observed the wave form of the isolated marks. The carrier level rose twice with increasing readout field. However, the position of the leading edge mainly changed when increasing the field. We think that the low crosstalk is attributable to the enhancement of the front mask area. The trilayer media enables an areal density of 3 Gbit/in.2 © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364724
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  • 14
    Electronic Resource
    Electronic Resource
    Phaedrus-T probe techniques : Proceedings of the tenth topical conference on high temperature plasma diagnostics (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 434-436 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Probe techniques employed in ohmic, rf, and H-mode Phaedrus-T tokamak plasmas are discussed. The floating potentials of nonemitting probes are found to be insensitive to plasma potential fluctuations at the rf frequency. Both Langmuir and emissive probes have been swept. The Langmuir probes were swept into electron saturation where a low-frequency oscillation was sometimes observed. Large probes (biased electrodes) have been used to perturb the plasma into an H mode. The biased electrode I-V characteristics differ from those of nonperturbing Langmuir probes and can be used to help identify the H mode. Probe behavior during the H mode is discussed. Two novel reciprocating probe designs have been developed. The faster of the two achieves average speeds of 5 m/s, which to our knowledge makes it the world's fastest. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146371
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  • 15
    Electronic Resource
    Electronic Resource
    Measurements on rotating ion cyclotron range of frequencies induced particle fluxes in axisymmetric mirror plasmas (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 2947-2954 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A comparison of phenomenological features of plasmas is made with a special emphasis on radio-frequency induced transport, which are maintained when a set of two closely spaced dual half-turn antennas in a central cell of the Phaedrus-B axisymmetric tandem mirror [J. J. Browning et al., Phys. Fluids B 1, 1692 (1989)] is phased to excite electromagnetic fields in the ion cyclotron range of frequencies (ICRF) with m=−1 (rotating with ions) and m=+1 (rotating with electrons) azimuthal modes. Positive and negative electric currents are measured to flow axially to the end walls in the cases of m=−1 and m=+1 excitations, respectively. These parallel nonambipolar ion and electron fluxes are observed to be accompanied by azimuthal ion flows in the same directions as the antenna-excitation modes m. The phenomena are argued in terms of radial particle fluxes due to a nonambipolar transport mechanism [Hojo and Hatori, J. Phys. Soc. Jpn. 60, 2510 (1991); Hatakeyama et al., J. Phys. Soc. Jpn. 60, 2815 (1991), and Phys. Rev. E 52, 6664 (1995)], which are induced when azimuthally traveling ICRF waves are absorbed in the magnetized plasma column. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872427
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  • 16
    Electronic Resource
    Electronic Resource
    Didymium-Fe-B sintered permanent magnets (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 4146-4148 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Present works describe the developments the low cost R-Fe-B sintered permanent magnets. Three different didymiums are chosen for the low cost mixtures of rare-earth elements. The studied alloy compositions are Fe-(32.5–34.5)wt. %R-(1–1.6)wt. %B, where R elements are didymium (Nd-10wt. %Pr), 5Ce-didymium (Nd-15%Pr-5%Ce), and 40 Ce-didymium (Nd-10%Pr-40%Ce). The specimens were prepared by the conventional powder metallurgical techniques. The best magnetic properties obtained in this studies are Br=13.2 kG, iHc=10.2 kOe, and (BH)max=40 MGOe with the Fe-33.5% (5Ce-didymium)-1%B alloy. Temperature dependence of iHc of this alloy is almost comparable to that of the Nd-Fe-B alloys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334647
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  • 17
    Electronic Resource
    Electronic Resource
    The effect of titanium on microstructure and magnetic properties of Fe-Cr-Co hard magnetic materials (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 4167-4169 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fe-Cr-Co ductile alloys produce magnetic properties comparable to those of Alnico permanent magnets family, up to (BH)max=91.2 kJ/m3(11.4 MGOe). It is technologically known that the addition of Ti to the Fe-Cr-Co alloys extends the α-phase region of system and improves the magnetic properties. The purpose of this work is to study the effect of Ti on microstructures and magnetic properties of Fe-Cr-Co alloys. The microstructures of Fe-25 wt.% Cr-12 wt.% Co alloys with or without Ti melted in air or in vacuum, were studied by optical microscopy, electron probe microanalysis (EPMA), and transmission electron microscopy (TEM). The alloys without Ti exhibit the precipitates of Cr23C6 carbide and Cr2N nitride a along the grain boundary or inside grain. These carbides and nitrides form the Cr-depleted zone around them. However, the addition of Ti suppressed the formation of Cr-depleted zone, in forming the Ti(C,N), and the magnetic properties are improved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334652
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  • 18
    Electronic Resource
    Electronic Resource
    Temperature dependence of the effective permeability of the resin-molded Sendust alloys (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 4252-4254 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effective permeability ( μeff) of the ring Sendust alloys (Fe-9–10 wt. % Si-5–7 wt. %Al), molded with Epoxy resin, was measured in the temperature range of −10 to 70 °C. The μeff of the alloys in molded condition measured at 20 °C is smaller than that in unmolded condition. The high values of the μeff at 20 °C of the molded alloys were obtained from the alloys in which magnetostriction constants (λs) were close to zero. The temperature dependencies of the μeff for the studied alloys in the unmolded condition are very similar, but after molding they are classified into four variations depending on the value of λs. When the alloys have large positive or negative values of λs, the μeff increases or decreases monotonically with increasing temperatures, but for the alloy with λs (approximately-equal-to)0, the μeff temperature dependence is complex. These behaviors of the μeff with temperature are interpreted on the basis of the induced stress, initiating from the differences in thermal expansion between alloys and Epoxy resin. The μeff of the molded alloys was mainly dominated by the induced uniaxial magnetic anisotropy (Ku) by the tangential and axial compressive stresses in the molded ring alloys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335475
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  • 19
    Electronic Resource
    Electronic Resource
    GaAlAs gain-guided semiconductor lasers with a curved facet (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 1667-1669 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: GaAlAs gain-guided semiconductor lasers having a curved facet are fabricated by employing reactive ion beam etching. The use of the curved facet permits stabilization of transverse mode in the direction parallel to the junction plane, reduction of astigmatism, and multilongitudinal mode oscillation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98537
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  • 20
    Electronic Resource
    Electronic Resource
    Transverse-mode-stabilized ridge stripe AlGaInP semiconductor lasers incorporating a thin GaAs etch-stop layer (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1391-1393 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Transverse-mode-stabilized ridge stripe AlGaInP semiconductor lasers fabricated using a thin GaAs layer as an etch stop are reproducibly realized. The ridge stripe structure is fabricated utilizing the large difference in etching rates between GaAs/AlGaAs and AlGaInP layers. As a result, the thickness control of the cladding layer adjacent to light absorbing layers is significantly improved. Results show that the GaAs layer is effective as an etch-stop layer even if the thickness is only 1–2 nm. The total internal loss of the lasers is estimated to be about 20 cm−1 and loss due to the insertion of the GaAs layer is almost negligible. A threshold current of about 50 mA and a stable fundamental transverse mode up to an output power of about 10 mW is attained at room temperature under cw operation. Similar results were obtained when an AlGaAs layer was used instead of GaAs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100676
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