高温超伝導体の強力擬似永久磁石としての応用

概要

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High-temperature superconductors prepared by the melt-process technique are capable of trapping a large number of quantized flux-lines, because of their strong pinning effect. The most recent advance in the processing technique is the synthesis of high-quality samples of the Sm-Ba-Cu-O system, which has been accomplished by the addition of Ag to the starting material. The magnetic flux density trapped by this material has now reached 9 T at 25 K, which is comparable to the magnetic flux density produced by ordinary superconducting magnets. Once the magnetic flux has been trapped, the sample can be regarded as a quasipermanent magnet with a magnetic field ten times larger than conventional permanent magnets. We review recent progress in material processing and magnetization techniques, and discuss the key factors for practical applications of these materials
社団法人日本磁気学会の論文
1999-04-01