期刊
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
卷 29, 期 5, 页码 -出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TASC.2019.2904471
关键词
MgB2; superconducting magnetic shield
资金
- 2017 National Postdoctoral Program for Innovative Talents [BX201700013]
- National Natural Science Foundation of China [11674376, 91321208]
- National Key Research and Development Program of China [2016YFA0300601]
- Beijing Natural Science Foundation [4152021]
- CAST-BISEE
With the development of weak magnetic detection methods, the sensors, like superconducting quantum interference device (SQUID), become more and more sensitive. The magnetic shielding takes a more important part in weak signal detection systems than before. Traditional magnetic shielding methods are expensive, not flexible, and hard to prevent the low-frequency magnetic field clearly. For the superconducting magnetic shield, the operating temperature of a low critical temperature superconducting magnetic shield has high demand on refrigerating system. The high critical temperature superconducting magnetic shielding would introduce thermal magnetic noise. Due to the excellent superconductive property, the medium-temperature superconductor MgB2 has a huge potential to build the magnetic shielding system. In this article, we fabricate an MgB2 superconducting magnetic shielding cup with Mg Liquid Infiltration method. The highest T-C of the sample is 39.4 K. The highest J(C) is 106 A/cm(2) at 4.2 K. The shielding effect of the cup has been tested at axial dc weak magnetic field and the shielding factor exceeds 2000.
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