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Three kinds of screen-printed tapes with a single rectangular, square and circular superconductor core have been fabricated, and the trapped magnetic field distributions after removal of external field perpendicular to a tape surface have been investigated using scanning Hall sensor magnetometry with an active area of . Numerical calculations carried out by modelling current loops explain well the measured magnetic profile for the rectangular tape and the analyses yield a critical current density of that nearly agrees with the value of at 77 K in the self-field found from transport measurements. This establishes a basis for the validity of the calculation procedure for the magnetic profiles and opens a new way to characterize the sample and to determine the value in place of transport measurements. The same calculations give a nice agreement with the experimental profiles for the square and circular tapes, where the conventional dc four-probe method does not work, and the analyses determine the value to be for the former and for the latter in place of the transport data.
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Oota et al. (1998) studied this question.
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