Superior homogeneity of trapped magnetic field in superconducting MgB2 bulk magnets

Homogeneity of trapped magnetic field in radial and circumferential directions of high temperature superconducting bulk magnets, MgB2 (Tc ∼38.3 K) and YBa2Cu3Oy (Tc ∼91.5 K), have been measured. In polycrystalline MgB2 bulks, the circularity of trapped magnetic field in a cylindrical disk is over 97...

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Bibliographic Details
Published in:Superconductor science & technology 2017-03, Vol.30 (3)
Main Authors: Ishihara, A, Akasaka, T, Tomita, M, Kishio, K
Format: Article
Language:English
Subjects:
homogeneity
MgB
superconducting bulk magnets
trapped magnetic field
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Summary:Homogeneity of trapped magnetic field in radial and circumferential directions of high temperature superconducting bulk magnets, MgB2 (Tc ∼38.3 K) and YBa2Cu3Oy (Tc ∼91.5 K), have been measured. In polycrystalline MgB2 bulks, the circularity of trapped magnetic field in a cylindrical disk is over 97% at 20-32.5 K, while that of YBa2Cu3Oy was ∼87% at 77 K. Magnetic field distribution of MgB2 bulk was satisfactorily homogeneous and these measurements suggest MgB2 bulks with highly efficient cryocoolers should be very useful for novel high field permanent magnet applications.
ISSN:0953-2048
1361-6668
DOI:10.1088/1361-6668/30/3/035006