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Title: Magnetic flux-trapping of anisotropic-grown Y-Ba-Cu-O bulk superconductors during and after pulsed-field magnetizing processes
Authors: Oka, T.Yamada, Y.Horiuchi, T.Ogawa, J.Fukui, S.Sato, T.Yokoyama, K.Langer, M.
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Issue Date: 2014
Published in: Journal of Physics: Conference Series, Volume 507, Issue Part 1
Publisher: Milton Park : Taylor & Francis
Abstract: The magnetic flux penetration into the melt-textured Y-Ba-Cu-O high temperature superconducting bulk magnets were precisely evaluated during and after the pulsed field magnetization processes operated at 30 K. The bulk magnets were carefully fabricated by the cold seeding method with use of a single and a pair of seed crystals composed of the Nd-Ba-Cu-O thin films. These seed crystals were put on the top surfaces of the precursors to let the large grains grow during the heat treatments. We observed the flux penetrations which occurred in the lower applied-field regions at around 3.1 T for the samples bearing the twin seeds than those of the single-seeded crystals at around 3.8 T. This means that the magnetic fluxes are capable of invading into the twin-seeded samples more easily than the single-seeds. It suggests that the anisotropic grain growths of parallel and normal to the rows of seed crystals affects the variations of Jc values with different distributions of the pinning centers, results in the preferential paths for the invading magnetic fluxes.
Keywords: Anisotropy; Copper; Gadolinium compounds; Grain growth; High temperature superconductors; Magnetism; Magnets; Superconducting films; Superconducting magnets; Superconducting materials
DDC: 530
License: CC BY 3.0 Unported
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