MgB2 bulk superconducting magnet

TL;DR

This paper reports the development of MgB2 bulk superconducting magnets with high trapped magnetic fields exceeding 3 Tesla at low temperatures, demonstrating their potential for practical applications.

Contribution

The study introduces a method to produce MgB2 bulk superconducting magnets with record-high trapped fields over 3 Tesla at cryogenic temperatures.

Findings

Trapped magnetic fields of 1.2, 2.8, and 3.1 T at 30, 20, and 17.5 K

First record of trapped field over 3 T in MgB2 bulks

Successful fabrication of disk-shaped MgB2 magnets

Abstract

We have developed disk-shaped MgB2 bulk superconducting magnets (20, 30 mm in diameter, 10 mm in thickness) using the in-situ process from Mg and B powders and evaluated the temperature dependence of trapped magnetic field. A pair of two disc-shaped bulks of 30 mm in diameter and 10 mm in thickness magnetized by field-cooling condition showed trapped fields of 1.2, 2.8 and 3.1 T at 30, 20 and 17.5 K, respectively. High trapped field over 3 T was recorded for the first time.