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  • Articles: DFG German National Licenses  (10)
  • 1985-1989  (10)
  • 1989  (6)
  • 1988  (4)
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  • Articles: DFG German National Licenses  (10)
Material
Years
  • 1985-1989  (10)
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Very high speed GaInAs metal-semiconductor-metal photodiode incorporating an AlInAs/GaInAs graded superlattice (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 16-17 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A lateral structure metal-semiconductor-metal photodiode has been fabricated on GaInAs, in which an AlInAs/GaInAs graded superlattice has been incorporated. This photodiode has exhibited a dark current lower than 100 nA, an internal quantum efficiency of greater than 80% at a wavelength of 1.3 μm, and a capacitance of 40 fF, all at the bias voltage of 10 V. The response speed of this photodiode has been characterized by electro-optic sampling to exhibit a full width at half maximum of 14.7 ps.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100822
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Room-temperature exciton optical absorption peaks in InGaAsP/InP multiple quantum wells (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1353-1355 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We grew In1−xGaxAsyP1−y/InP quantum wells (QWs) by low-pressure metalorganic vapor phase epitaxy. The In1−xGaxAsyP1−y layer was closely lattice matched to InP with a composition of y=0.9 (x=0.47y). We investigated structural imperfections such as composition fluctuations, interface roughness, and nonperiodicity analyzing the low-temperature photoluminescence linewidth. We found that the InGaAsP layer composition fluctuated, causing about 5 meV inhomogeneity in the exciton energy level in QWs wider than about 3 nm. Since we obtained very smooth interfaces with less than one monolayer of fluctuation and excellent periodicity by lowering growth temperature to 570 °C, the inhomogeneity of the exciton energy level could be held at 6 meV for 20-period 10-nm multiple QWs. As a result, despite composition fluctuations, a clear room-temperature exciton optical absorption peak was observed at 1.5 μm for the first time to our knowledge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100713
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Evaluation of exciton absorption peak broadening factors in InGaAsP/InP multiple quantum wells (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 2290-2292 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We evaluated the magnitude of broadening factors of ground-state exciton absorption peaks in In1−xGaxAsyP1−y/InP (x=0.47y) multiple quantum wells (MQW's) with about 10 nm wells. The absorption peaks broadened with a decrease of y. Analyzing the absorption peak broadening with increasing temperature, the thermal broadening factor at 300 K was found to be about 9 meV and composition independent. Analyzing the photoluminescence linewidth at 4.2 K, it was found that composition fluctuations in the well caused an inhomogeneity of the exciton energy level of 4.4 meV for the y=1.0 MQW and 7.5 meV for the y=0.6 MQW, being the greatest contributors to inhomogeneous broadening. We conclude that the exciton absorption peak broadening with a decrease of y is primarily due to the increase of composition fluctuations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100256
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic properties of BiFeO3-BaTiO3 and BiFeO3-PbTi(Zr)O3 glassy sputtered films (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5434-5436 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic properties of glassy oxide films which exhibit ferromagnetism and ferroelectricity simultaneously above room temperature prepared by reactive rf sputtering are presented. Nominal film composition is the solid solution compound system expressed by (1−x)BiFeO3-x ABO3, x=0–1 where ABO3 denotes ferro- (antiferro-) electric perovskites, such as BaTiO3, PbTiO3, and PbZrO3. Spontaneous magnetization 4πMs for as-deposited films is small behaving paramagnetically and does not show the compositional dependence. After annealing at temperatures of 600–700 °C in either air or PbO atmosphere, considerably large 4πMs exceeding 1 kG appears at the solid solution composition. All samples with large 4πMs are x-ray amorphous and a rapid decrease in 4πMs takes place after annealing at higher temperatures ((approximately-greater-than)800 °C), where still unidentified crystallites are precipitated. Mössbauer absorption spectra were done to understand the origin of ferromagnetism. Besides pronounced magnetic (and/or dielectric) properties, these films have a high transmittance from visible through near-infrared regions, so that they are expected to be useful as optoelectronic device materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342338
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Fabrication of transparent iron-oxide films by means of sol-gel synthesis (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5452-5452 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Transparent iron-oxide films were fabricated by sol-gel synthesis using a solution of ferric nitrate (III) dissolved in ethylene glycol.1 The solution was kept at 80 °C and stirred constantly in a nitrogen atmosphere. The gel with an appropriate viscosity was spin coated on soft glass plates, then dried and heated in air at various temperatures for 5 h. The films thus prepared are about 0.2 μm thick, amber colored, and especially transparent in the near-infrared region, whose transmittance exceeds 90%. Maximum saturation magnetization 4πMs=0.74 kG [curve (a)] was obtained by annealing at 450 °C, which is still insufficient to use practical application. Reduction heat treatment in a hydrogen atmosphere is found to be very effective to improve magnetic properties: 4πMs is increased to 3 kG [curve (b)], which is about four times as large as the previous one, but the films become semitransparent due to formation of magnetite particles. Original high transmittance recovers by successive annealing in air at 400 °C without any degradation of magnetic properties [curve (c)], where diffraction peaks of maghemite were observed. This strongly suggests that magnetic anisotropy may be arbitrarily controlled by forming linear chains of ferromagnetic particle clusters through reduction heat treatment in a magnetic field. Faraday rotation θF of the samples was also measured. These films are promising as a new type magneto-optic material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342345
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Preparation and characterization of (111)-oriented Fe3O4 films deposited on sapphire (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 3168-3172 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Films of various iron oxides including FeO, Fe3 O4 , and α-Fe2 O3 were formed on the α-Al2 O3 (0001) surface by a reactive vapor deposition method and characterized by x-ray diffraction and conversion electron Mössbauer spectroscopy (CEMS). The formation range for each phase was determined as a function of the substrate temperature (Ts ) and oxygen partial pressure (PO2 ). Typically, the deposition of (111)-oriented epitaxial magnetite films could be performed at low temperatures of Ts =523∼623 K and PO2 =1.0–5.0×10−4 Torr. Good stoichiometry of the as-grown films were confirmed by CEMS, and the Verwey transition was clearly detected by measurements of resistivity and CEMS down to 77 K. However, the large lattice mismatch between the substrate and Fe3 O4 resulted in a columnar particle growth. The initially grown phase on such a mismatched substrate was specifically characterized by depositing the Mössbauer active isotope, 57 Fe, only at the deepest layers. On the other hand, by depositing 57 Fe only in the topmost layers, surface layers of well-crystallized films have been found to be rather stable against oxidation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344154
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Free-carrier lifetime and deep-level luminescence in semi-insulating GaAs: The influence of indium doping and growth in a magnetic field (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 1800-1804 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The influence of In doping and/or of growth in a magnetic field on the properties of Czochralski-grown semi-insulating GaAs wafers is investigated. We determine the spatial distribution of the free-carrier lifetime by time-resolved luminescence in the ps regime. The results are compared with the spatial distribution of the near-band-edge and deep-level luminescence. The macroscopical and microscopical homogeneity of the carrier lifetime and the luminescence intensities are improved by the growth in a magnetic field. Indium doping leads to similar improvements and additionally to an increase of the absolute value of the lifetime. The combination of In doping and growth in a magnetic field gives the best results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344351
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  • 8
    Electronic Resource
    Electronic Resource
    Characterization of the antigens that induce the production of antibodies in mice immediately after infection withAngiostrongylus cantonensis (1989)
    Springer
    Parasitology research 75 (1989), S. 636-640 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Following the infection of mice )a non-permissive host) withAngiostrongylus cantonensis, the occurrence of parasite-specific antibodies in the serum was monitored during the first 5 weeks after infection by the Ouchterlony method and by an immunoblotting technique, with special reference to the antigens recognized by host IgG antibodies. Only the serum from infected mice 7 days postinfection formed a single, distinct precipitin line when tested on Ouchterlony plates against extracts of digestive organs, reproductive organs, and body wall from adult female worms. In each case the precipitin line fused totally with that formed between the serum from infected mice and one of the other organ extracts. When the serum from infected mice was used as a blotting antibody under both reducing and nonreducing conditions, specific bands with molecular weights in the range from 60 000 to 〉200 000 daltons were developed with each organ extract, although molecular weights varied according to the organ from which the antigenic extract was prepared. Further analyses on Ouchterlony plates and by immunoelectrophoresis and comparison with the reactivity of serum from permissive rat hosts infected 35 days postinfection with the same parasite revealed that an additional reactivity, distinct from that in rats, predominantly occurred in the serum from infected mice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00930962
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  • 9
    Electronic Resource
    Electronic Resource
    Immunoblot analysis of the circulating antigens occurring in serum of rats infected with Angiostrongylus cantonensis (1988)
    Springer
    Parasitology research 74 (1988), S. 476-483 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Following the infection of rats with Angiostrongylus cantonensis, the occurrence and molecular features of circulating antigens (CAs) were analyzed, with special reference to their origin in worms, by SDS-PAGE combined with an immunoblotting technique. Antisera against the CAs were obtained by immunizing rats with sera from rats 35, 91, and 150 days postinfection. The antisera, referred to as anti-CA(35), anti-CA(91), and anti-CA(150), respectively, formed one or two precipitin lines when tested in Ouchterlony plates against extracts of digestive organs (DE) and of reproductive organs (RE) from adult female worms. When the anti-CA(35) was used as a blotting antibody under nonreducing conditions, a set of clearly spaced narrow bands with molecular weights (mol. wt.) in the range of 90000–180000 daltons developed only in the case of the DE. Besides the antigen(s), additional bands with mol.wt. of 115000 and 185000 daltons were revealed in the case of the RE when two other antisera were used. Immunoblot analysis of the immunoprecipitates, derived from anti-CA(150) and sera of infected rats, revealed the occurrence of two types of protein as the major CAs: one had a mol.wt. in the range of 140000–180000 daltons and was found in the serum 14 days postinfection, and the other, with a mol.wt. of 185000 daltons, was found in the serum 35–150 days postinfection. Immunohistochemical studies localized the CAs predominantly in the cytoplasm of both uterine eggs and maturing oocytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00535149
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    A micro trap for fraction collection in micro-LC (1989)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 12 (1989), S. 63-64 
    Details
    ISSN: 0935-6304
    Keywords: Liquid chromatography, micro-LC ; Packed fused silica column ; Micro trap ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240120122
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