Abstract
Magnetic flux density of remanent state was measured for a QMG YBaCuO bulk superconductor. The double-piled disc samples with the size of 45mm ∅ × 15mm trapped the maximum surface flux density of 1.35 T at 77 K. On the other hand, the plate samples with the size of 10mm×40mm×8mm revealed giant flux jumps and trapped the flux density of about 2 T at 4.2 K. The magnetic instability of the plate sample sandwiched by extra pure aluminum plates were examined at 4.2 K by changing the thickness of aluminum. Then it was confirmed that the criterion of the magnetic stability was available for such teh composite sample. Experimental results revealed large possibility of realization of a 3 T class of a superconducting permanent magnet which is operated at about 20 K.
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