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Development of Iron-based Superconducting Bulk Magnet

Published version
Peer-reviewed

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)