The effect of high magnetic fields on the current carrying properties of magnesium diboride (MgB 2 ) bulks and Fe-sheathed tapes was investigated following different thermal sequences. It is found that application of a large magnetic field during processing results in the quite uniform microstructure and the better connectivity between the MgB 2 grains. As a result, the J c of these samples has shown much higher value than that of the MgB 2 samples in the absence of magnetic field. The possible mechanism of the J c enhancement under an external magnetic field is also discussed.
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Ma et al. (2006) studied this question.
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