Peer-reviewed
Quasipermanent magnets of high temperature superconductor: Temperature dependence
We report on persistent field in quasipermanent magnets of high temperature superconductors. Magnets composed of irradiated Y[sub 1+]Ba[sub 2]Cu[sub 3]O[sub 7] trapped field [ital B][sub [ital t]]=1.52 T at 77 K and 1.9 T at lower temperature. However, the activation magnet limited [ital B][sub [ital t]] at lower temperature. We present data on [ital J][sub [ital c]]([ital H],[ital T]) for unirradiated materials, and calculate [ital B][sub [ital t]] at various [ital T]. Based upon data at 65 K we calculate [ital B][sub [ital t]] in unirradiated single grains at 20 K, and find that 5.2 T will be trapped for grain diameter [ital d][similar to]1.2 cm, and 7.9 T for [ital d]=2.3 cm. Irradiated grains will trap four times these values
Article, 1993