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  • 1990-1994  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Magnetization and magnetic susceptibility of the diluted magnetic semiconductors Zn1−xCoxS and Zn1−xCoxSe : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6277-6279 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetization measurements have been done at 1.5 K and magnetic fields up to 7 T by using extraction method on the samples with x=0.0055, 0.048, 0.063 for Zn1−xCoxS and x=0.0097, 0.030, 0.037, 0.042 for Zn1−xCoxSe. In both Co-based systems, the magnetization increases with x. A modified Brillouin function fits the data and the fitting parameters T0( (approximately-greater-than) 0) and Seff are obtained. These results reflect that there exists a strong antiferromagnetic interaction among Co++ ions and the antiferromagnetic interaction in Zn1−xCoxSe is stronger than that in Zn1−xCoxS. Magnetic susceptibility was measured in the temperature range 1.5 K≤T≤300 K by using a vibrating-sample magnetometer. The susceptibility displays a high-temperature Curie–Weiss behavior. From quantitative analysis we obtain the nearest-neighbor Co++–Co++ exchange integral constant J1/kB for sulfides and selenides to be −51±6 K and −57±8 K, respectively. This value is at least three times as large as that in their Mn-based counterparts, and we confirm that the antiferromagnetic interaction is stronger in Zn1−xCoxSe than in Zn1−xCoxS. By using our results in conjunction with a direct measurement of the nearest-neighbor exchange JNN from recent inelastic neutron scattering for Zn1−xCoxS, we obtain an estimate of the next-nearest-neighbor exchange constant J2/kB = −8 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349966
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    In0.53Ga0.47As metal-semiconductor-metal photodiodes with transparent cadmium tin oxide Schottky contacts (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 1930-1932 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A metal-semiconductor-metal (MSM) In0.53Ga0.47As photodiode using a transparent cadmium tin oxide (CTO) layer for the interdigitated electrodes was investigated. The transparent contact prevents shadowing of the active layer by the electrodes, thus allowing greater collection of incident light. The barrier height (φBn) of CTO on i-In0.52Al0.48As was determined to be 0.47 eV, while the Ti/Au barrier height was 0.595 eV. The reduced barrier height for CTO is caused by tunneling through the sputter-damaged cap layer. Responsivity for 1.3 μm incident light was 0.49 and 0.28 A/W, respectively, for the CTO and Ti/Au MSM photodiodes. No antireflection (AR) coating was utilized over the bare semiconductor surface. The CTO MSM photodiode shows a factor of almost two improvement in responsivity over conventional Ti/Au MSM photodiodes. © 1994 American Institue of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112820
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  • 3
    Electronic Resource
    Electronic Resource
    Relationship between superficial response to environmental changes and adhesive property of polyurethane cross-linked polyacrylate network (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 51 (1994), S. 1207-1211 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A polyacrylic network containing carboxyl groups was cross-linked with polyurethane. The dynamic contact angles (DCA) on specimens were estimated in water. The effect of ingredient ratio and average molecular M̄n of poly(oxypropylene glycol) (PPG) on DCA were investigated. Data obtained are correlated with 180° peel strength by using the polymer network as an adhesive to adhere both poly(vinyl chloride) (PVC) and polyethylene (PE) film. Results reveal that there is correlation of the surface response to bilateral adhesion of polar and nonpolar substrates. © 1994 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1994.070510707
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