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  • 1990-1994  (27)
  • 1900-1904  (2)
  • 1
    Digitale Medien
    Digitale Medien
    A resistive superconducting quantum interference device with two quantization loops (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 4737-4740 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A simplified theoretical analysis and experimental investigations of a partially resistive superconducting quantum interference device with two quantization loops have been performed. The advantage of this device is an extremely large output signal. It is shown that the output signal oscillates with a period determined by the nonstationary Josephson relation. This device was experimentally compared to the dc resistive superconducting quantum interference device used as a test structure.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.355928
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  • 2
    Digitale Medien
    Digitale Medien
    A broadband picovoltmeter based on the direct current superconducting quantum interference device with additional positive feedback (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 3005-3011 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A picovoltmeter working at 4.2 K and based on a direct current superconducting quantum interference device (dc SQUID) with additional passive positive feedback for investigating the properties of superconducting thin films, Josephson junctions, and SQUIDs has been developed. It has a large small-signal bandwidth fm(approximately-equal-to)800 kHz, a slew rate of (approximately-equal-to)38 mV/s, a dynamic range of 146 dB, and a voltage resolution of 5 pV/Hz1/2 for a signal source impedance Rs=0 Ω. The noise temperature is (approximately-equal-to)0.6 K for Rs=1 Ω. In this article the dynamics and noise properties of the instrument are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1144593
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  • 3
    Digitale Medien
    Digitale Medien
    Modeling the dc superconducting quantum interference device coupled to the multiturn input coil. III (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 1000-1006 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The radio frequency (rf) properties of a dc superconducting quantum interference device (SQUID) coupled to a multiturn input coil have been studied both experimentally and theoretically using an expanded model of the coupled SQUID. The input coil and washer resonances observed in the measured impedance of the expanded model are shown to be in quantitative agreement with the theory presented previously. When the input coil resonances are suppressed by resistive damping, it is shown that the impedance of the coupled SQUID at low frequencies is determined solely by an effective inductance that is much lower than the SQUID inductance. A simple equivalent circuit of the coupled SQUID for this case is proposed. The rf properties of SQUIDs with gradiometric washer configurations are also discussed. It is shown that the rf properties of these devices can be predicted from the properties of the individual washers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.351824
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  • 4
    Digitale Medien
    Digitale Medien
    Modeling the direct current superconducting quantum interference device coupled to the multiturn input coil. II (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 2338-2346 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A complete circuit model of a dc superconducting quantum interference device (SQUID) coupled to a multiturn input coil has been developed. With this model, it is shown that the rf properties of the coupled SQUID can be calculated using only the given parameters of the SQUID. There are no adjustable parameters. The resonant structures in the SQUID characteristics caused by the presence of the input coil have been quantitatively studied. Methods to suppress the resonant structures have also been investigated. It is shown that the present circuit model explains well the experimentally observed rf properties of coupled SQUIDs. The present circuit model is therefore useful for the design of highly sensitive SQUIDs.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.351353
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  • 5
    Digitale Medien
    Digitale Medien
    Radio frequency pumped superconducting quantum interference devices with two quantization loops (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 2925-2938 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Conventional rf SQUIDs (superconducting quantum interference devices) consist of a superconducting loop interrupted by one weak link, and when read out via a tank circuit they produce output signals in the order of a few tens of microvolts. When the single weak link is replaced by a dc SQUID (a superconducting loop with two junctions) a so-called double quantization loop SQUID is formed. In this paper it is shown theoretically, and supported experimentally with thin-film devices of three different designs, that the general behaviour can be explained by a simplified picture of the fixed critical current of the single junction of the rf SQUID being replaced by an effective critical current of a dc SQUID loop that is varied by the applied magnetic flux (i.e., we have a rf SQUID with a variable β parameter). A more detailed analysis of the experimental data and the theory of this novel device reveals its interesting nonlinear character and shows the deviations from this simple picture. It is demonstrated experimentally that output signals in the order of ≥1 mV can be obtained with a suitable read-out mode for the tank circuit, a clear advantage when compared to conventional rf SQUIDs. With respect to dc SQUIDs, the coupling to integrated planar input coils will be unproblematic since no microwave resonances should occur in the structures.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.354649
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  • 6
    Digitale Medien
    Digitale Medien
    Plasma nitridation process for the fabrication of all-refractory Josephson junctions (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 3038-3042 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A process for the fabrication of high-quality, all-refractory Josephson junctions of the type Nb/Six Ny /Nb is described in detail. The junctions have been fabricated using the selective niobium anodization process with a tunnel barrier consisting of an amorphous Si film converted to its nitride by the application of a rf plasma of nitrogen. An attractive feature of these junctions is their comparably low specific capacitance C/A=3.9±0.1 μF/cm2 (for Jc =6 A/cm2 ). Junctions of this type having critical current densities up to Jc =2000 A/cm2 and Vm =16 mV have been fabricated. Excellent magnetic field threshold curves have also been observed for these junctions, indicating that the critical current density is very uniform.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.345432
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  • 7
    Digitale Medien
    Digitale Medien
    Low-noise high-speed dc superconducting quantum interference device magnetometer with simplified feedback electronics (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 406-408 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A dc superconducting quantum interference device (SQUID) magnetometer has been integrated on a 9×9 mm2 chip with eight pick-up loops in parallel to directly form a SQUID inductance of about 0.5 nH. Very simple feedback electronics have been developed which do not require liquid-helium temperature impedance matching circuits or flux modulation techniques. The magnetometer has a typical white noise of 8 fT/(Hz)1/2 and a 1/f corner frequency below 3.5 Hz. With an additional positive feedback circuit at 4.2 K the white noise level has been further reduced to 4.5 fT/(Hz)1/2. Using a two-pole integrator, a 3 dB bandwidth around 0.5 MHz and a maximum slew rate of 3 mT/s at 1.3 kHz have been attained with a ±0.4 μT feedback range.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.103650
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  • 8
    Digitale Medien
    Digitale Medien
    Practical low-noise integrated dc superconducting quantum interference device magnetometer with additional positive feedback (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 228-230 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have designed and fabricated a low-noise dc superconducting quantum interference device (SQUID) magnetometer that is integrated on a 4×4 mm2 chip. The white flux noise of the magnetometer measured in a flux-locked-loop mode using simple, direct-coupled electronics with additional positive feedback (APF) is 6.4×10−7 Φ0/(square root of)Hz. The corresponding white flux density noise is 3.9 fT/(square root of)Hz. The SQUID flux-to-voltage transfer function with APF is enhanced to 4.7 mV/Φ0 at the optimal working point, thereby significantly reducing the preamplifier contribution to the total noise. A maximum feedback field of 65 nT for frequencies up to 300 Hz and a maximum slew rate of 120 μT/s at 300 Hz have been attained using a two-pole integrator.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.105974
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  • 9
    Digitale Medien
    Digitale Medien
    Intrinsic stress of Ag and Au electrical contact films for high temperature superconductor thin films (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 279-281 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Thin films of the noble metals Ag and Au are prospective candidates for application as electrical contacts in high temperature superconductor (HTSC) thin film devices. We present first results on intrinsic stress in Ag and Au films measured during and after their UHV deposition onto YBa2Cu3O7−x thin film substrates. At 110 K film growth proceeds by columnar grain growth with tensile stresses as huge as the tensile strength of the bulk phase. At room temperature and up to 600 K the films grow via island growth developing much smaller film stress. At temperatures above 550 K a compressive stress contribution due to interdiffusion of oxygen from the HTSC substrates into the contact films is observed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.107937
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  • 10
    Digitale Medien
    Digitale Medien
    The Strategic Air Offensive against Germany: the Early Phase, May – September 1940 (1991)
    Cambridge : Cambridge University Press
    The @historical journal 34 (1991), S. 117-141 
    Details
    ISSN: 0018-246X
    Quelle: Cambridge Journals Digital Archives
    Thema: Geschichte
    Notizen: Given the vast amount of literature that has been published about bomber command's role during the Second World War, it might seem, at first sight, that there was not much to add. The magisterial volumes of the official history written by Sir Charles Webster and Dr Noble Frankland appear to have said all there is to say; and to them must now be added numerous books which they have helped to engender, such as – to mention but the most recent two – those of John Terraine and Max Hastings.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1017/S0018246X00013959
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