Abstract
The authors discuss means to verify the analysis and the limitations imposed by the low critical current densities in presently available high-temperature superconductors. Based on experimental data, it is concluded that : (1) high-temperature superconductors can be used as permanent magnets with trapped fields of at least 3 T at 77 K; (2) their energy product should be as high as 1.8 MJ/m/sup 3/ or 255 MG-Oe; (3) the magnetizing field has to be four times as large as the trapped field, or 12 T; (4) permanent-magnet use of high-temperature superconductors bypasses the problems of wire or tape manufacture; and (5) widespread use of this concept will depend on improved critical current densities.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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