TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)
Online ISSN : 1880-0408
Print ISSN : 0389-2441
ISSN-L : 0389-2441
Focused Reviews
Development of Iron-based Superconducting Bulk Magnet
Akiyasu YAMAMOTOJeremy WEISSMark AINSLIEAnatolii POLYANSKIIDavid LARBALESTIEREric HELLSTROM
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2017 Volume 52 Issue 6 Pages 397-404

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Abstract

This article reviews the recent development of bulk trapped field magnet made with iron-based superconductor (IBSC). A trapped field of over 1 T at 5 K and 0.5 T at 20 K has been measured between a stack of magnetized cylinders of bulk polycrystalline Ba0.6K0.4Fe2As2 superconductors 10 mm in diameter. Magneto-optical imaging revealed a trapped field distribution corresponding to uniform macroscopic current loops circulating through the sample. A standard numerical modelling technique using the measured Jc(B, T) characteristics of a small specimen reproduced the experimentally measured trapped fields well, again indicating the homogeneous current loops in the polycrystalline bulk. Given the untextured polycrystalline nature of the cylinders and their large irreversibility field, it is expected that larger IBSC bulks could trap much higher field.

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© 2017 by Cryogenics and Superconductivity Society of Japan (Cryogenic Association of Japan)
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