Development of Iron-based Superconducting Bulk Magnet


Type
Article
Change log
Authors
YAMAMOTO, Akiyasu 
WEISS, Jeremy 
AINSLIE, Mark 
POLYANSKII, Anatolii 
LARBALESTIER, David 
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.

Description
Keywords
5108 Quantum Physics, 51 Physical Sciences
Journal Title
TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)
Conference Name
Journal ISSN
0389-2441
1880-0408
Volume Title
52
Publisher
Cryogenic Association of Japan
Sponsorship
Royal Academy of Engineering (RAEng) (10216/113)
Engineering and Physical Sciences Research Council (EP/P020313/1)
Japan Society for the Promotion of Science (15H05519)