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  • Wiley-Blackwell  (51)
  • American Institute of Physics (AIP)  (39)
  • American Association for the Advancement of Science (AAAS)
  • 11
    Electronic Resource
    Electronic Resource
    Recording on Co/Pt magneto-optical disks using a 488-nm wavelength laser (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5133-5135 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Co/Pt multilayer disks with a double-layer and a quadri-layer structure were prepared on a 2 P (photopolimerized) glass substrate with 1-μm-pitched grooves. The read/write characteristics of the disks were studied using Ar gas laser at a wavelength of 488 nm. It was confirmed that very small domains 0.3 μm in length were stably recorded. The carrier-to-noise ratio was 29 and 32 dB (30 kHz BW) at a mark length of 0.3 μm for double-layer and quadri-layer disks, respectively, being larger than that measured for a TbFeCo disk because of a higher figure of merit. In higher-density recording below 0.5-μm mark length, a quadri-layer disk shows a larger recording power margin than a double-layer disk due to the smaller expansion of domain with power, originating from the sharper thermal distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348988
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  • 12
    Electronic Resource
    Electronic Resource
    Film thickness dependence of magneto-optical and magnetic properties in Co/Pt and Co/Pd multilayers (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4429-4431 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Co/Pt and Co/Pd multilayers were prepared by two source dc-magnetron sputtering. It was found that magneto-optical and magnetic properties of the multilayers were affected by total film thickness. Kerr rotation angle of the films was remarkably enhanced at the film thickness below several hundred angstroms. The theoretical calculation clarified that the increase of Kerr rotation was due to optical interference and multiple reflection. The shape of Kerr loop also depends upon the film thickness and a perfect squareness is attained only at the ultrathin region. The improvement in the squareness of Kerr loop can be explained by the change in the domain structure from a stripe domain to a single domain. These behaviors at the ultrathin region in the multilayers are suitable for new magneto-optical recording media.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344921
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  • 13
    Electronic Resource
    Electronic Resource
    High-power truncated-inverted-pyramid (AlxGa1−x)0.5In0.5P/GaP light-emitting diodes exhibiting 〉50% external quantum efficiency (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 2365-2367 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A truncated-inverted-pyramid (TIP) chip geometry provides substantial improvement in light extraction efficiency over conventional AlGaInP/GaP chips of the same active junction area (∼0.25 mm2). The TIP geometry decreases the mean photon path-length within the crystal, and thus reduces the effects of internal loss mechanisms. By combining this improved device geometry with high-efficiency multiwell active layers, record-level performance for visible-spectrum light-emitting diodes is achieved. Peak efficiencies exceeding 100 lm/W are demonstrated (100 mA dc, 300 K) for orange-emitting (λp∼610 nm) devices, with a peak luminous flux of 60 lumens (350 mA dc, 300 K). In the red wavelength regime (λp∼650 nm), peak external quantum efficiencies of 55% and 60.9% are measured under direct current and pulsed operation, respectively (100 mA, 300 K). © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125016
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  • 14
    Electronic Resource
    Electronic Resource
    Correlation time of density fluctuation for supercritical ethylene studied by dynamic light scattering (2002)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 116 (2002), S. 4985-4992 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Time dependence of density fluctuation for neat supercritical ethylene (C2H4) is investigated by dynamic light scattering at various densities in isothermal conditions of reduced temperatures Tr=T/Tc=1.02, 1.04, and 1.06. Time correlations of the density fluctuation for all thermodynamic states decay as single exponential functions with the time constant of submicrosecond. Critical slowing down of diffusive motions is observed in the time domain, and the correlation time of the density fluctuation becomes maximum at the extension of the gas–liquid coexistence curve on the P–T phase diagram. It is revealed that the time dependence of the density fluctuation just corresponds to the magnitude of static density fluctuation obtained by small-angle x-ray scattering measurements. By measuring correlation times as a function of scattering angle, the critical slowing down is thermodynamically discussed. It is elucidated experimentally that the critical slowing down of diffusive motions considerably correlates to the increase of specific heat capacity, the decrease of the thermal diffusivity, and rotational relaxation time in the supercritical state of the neat fluid. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1452112
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  • 15
    Electronic Resource
    Electronic Resource
    Ultrathin Co/Pt and Co/Pd multilayered films as magneto-optical recording materials (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 2136-2142 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Co/Pt and Co/Pd multilayered films were prepared by two-source dc magnetron sputtering. The multilayers with thin Co layers, one to three atoms thick, exhibited a perfect squareness of Kerr loop and an enhancement of Kerr rotation when the total film thickness became below several hundred angstroms. These ultrathin films have a high Kerr rotation of 0.2°–0.45° and strong perpendicular magnetic anisotropy even in the very thin-film thickness. The figure of merit of the ultrathin Co/Pt films is superior to that of TbFeCo system at 780 nm and becomes larger at shorter wavelength. The ultrathin multilayers possess very high corrosion resistance, and the layered structure is thermally stable up to 400 °C. Consequently, the ultrathin Co/Pt and Co/Pd multilayered films can be new magneto-optical recording materials, especially for higher density recording using a shorter wavelength laser.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345548
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  • 16
    Electronic Resource
    Electronic Resource
    Hydrogen cyanide laser interferometer of the JFT-2M tokamak and feedback stabilization of the beat frequency using a microcomputer (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1290-1295 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A hydrogen cyanide laser interferometer with three vertical chords was installed in the JFT-2M tokamak for electron density measurement. The optical arrangment of the interferometer is a Mach–Zehnder type and its structure is mechanically independent of the JFT-2M machine in order to suppress the mechanical vibration. Two HCN lasers are employed for direct reading of the chord averaged electron density by means of beat modulation method. The beat frequency between two HCN lasers is stabilized at a constant frequency by a feedback circuit using a microcomputer. A combination of short dielectric waveguides and TPX lenses is employed to compensate the refraction and divergence of the laser beam. It was shown experimentally that the interferometric measurement of the electron density was scarcely affected by the mechanical vibration of the interferometer and the refraction of the probing laser beam up to n¯e=6×1019 m−3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138590
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  • 17
    Electronic Resource
    Electronic Resource
    The high-frequency oscillation of current and voltage in a plasma-focus discharge device (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 1504-1510 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The presence of a high-frequency ((approximately-greater-than)6 MHz) oscillation in the discharge current and voltage of a plasma-focus device is found experimentally and is explained by using equivalent circuit analyses. The occurrence of such an oscillation is attributed to the excitation of the resonant oscillation in the discharge circuit. It is also shown that the high-frequency response of the driver circuit, which consists of a capacitor bank and cables, plays an important role in determining the high-frequency behavior of the discharge current and voltage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142476
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  • 18
    Electronic Resource
    Electronic Resource
    New crystalline soft magnetic alloy with high saturation magnetization (invited) (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3514-3519 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Extensive study was made on Fe-base crystalline alloys in search for new soft magnetic materials with high saturation magnetization by means of sputtering technique. It revealed that newly found FeGaSi and FeAlGe alloy systems possessed excellent soft magnetic properties with remarkably higher saturation magnetization. These new alloy films, annealed in vacuum at 500 °C for 1 h, show the magnetic properties of Bs=13 and 15 kG, Hc=0.09 and 0.20 Oe, and μ1 MHz=2000 and 1800 for the FeGaSi and FeAlGe alloy films of 2 μm in thickness, respectively. These values are superior to those of FeAlSi (sendust) alloy which is a typical soft magnetic material with high saturation magnetization. Results of the Co-added systems of FeCoGaSi and FeCoAlGe alloys are also presented. Discussions are given on various systems of Fe base crystalline alloy films studied, which are classified into four types of groups with respect to magnetic softness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338712
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  • 19
    Electronic Resource
    Electronic Resource
    Nonlinear optical properties of p-substituted benzalbarbituric acids (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 718-718 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A number of p-substituted benzalbarbituric acid derivatives were synthesized by the reaction of p-substituted benzaldehyde with barbituric acid, and their nonlinear optical properties were investigated by using the Kurtz powder test. p-acetamidobenzalbarbituric acid derivatives were found to exhibit the relatively high second-harmonic intensity and have the higher thermal stability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102691
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  • 20
    Electronic Resource
    Electronic Resource
    High-resolution focused ion beam lithography (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 868-870 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The resolution of focused ion beam (FIB) lithography has been studied by proximity effect measurement and fine pattern fabrication. In the proximity effect measurement, a 0.1 μm line pattern, according to the gap between square and line patterns, could be achieved. Moreover, 0.1 μm line and space poly(methylmethacrylate) patterns and 0.1 μm linewidth novolak based negative resist could be fabricated at 1×1013 and 2×1012 ions/cm2 dose by 260 keV Be++ FIB with 0.1 μm beam diameter, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100098
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