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  • 1990-1994  (3)
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Material
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  • 1
    Electronic Resource
    Electronic Resource
    Flux trapping in superconducting thin films in weak magnetic fields (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 6293-6296 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic-field distribution measurements over a patterned superconducting strip line sample were conducted using a superconducting quantum interference device pickup coil, showing that, in the range of 500 μG–50 mG of perpendicular magnetic field B⊥,i, the superconducting films record previous magnetic histories precisely. The magnetic-field distribution with a field B⊥,i applied at all times is identical to one with no field applied at any time. A calculation based on the flux trapping model explains these results indicating that all the magnetic fluxes penetrate the superconducting thin films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355148
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Sweeping of trapped flux in superconducting films by a micro-heat-flushing method (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 2411-2417 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new technique has been developed to remove flux quanta trapped in superconducting film. It consists of measuring the magnetic field distribution over a superconductor with an rf superconducting quantum interference device (SQUID) and removing the detected trapped flux using laser beam scanning. The trapped flux movement follows the motion of the Ar laser beam exactly. By scanning the laser beam over the trapped flux quanta, the trapped flux is successfully moved to any desired location. Comparison with heat flushing method, the most important advantages of this technique are (i) the flux movement in the superconducting film can be controlled precisely; (ii) by adjusting the laser power so as to change the diameter of the normal hot spot, flux creations caused by the thermoelectric potential of the material can be avoided. These results show that our technique is very useful in the field of Josephson junction electronics and other areas that require extremely low magnetic field environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351585
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Technique for measuring absolute intensity of weak magnetic fields by a SQUID pick-up coil system (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 3972-3977 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A method to measure the absolute intensity of a weak magnetic field is described. This method uses patterned superconducting strip lines as a spatial modulator of the field and detects the magnetic field distribution over them as a function of applied magnetic fields. The field distribution change measured by an rf SQUID system is proportional to the component of the absolute intensity of the magnetic field at the specimen that is parallel with the pick-up coil axis. The magnetic field intensity can be determined absolutely from about 1 μG by this method. A spatial resolution of the field as good as a few millimeters is obtained. Some practical limitations of this method and possible ways for improving are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143247
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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