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Title: Permanent magnet with MgB{sub 2} bulk superconductor

Abstract

Superconductors with persistent zero-resistance currents serve as permanent magnets for high-field applications requiring a strong and stable magnetic field, such as magnetic resonance imaging. The recent global helium shortage has quickened research into high-temperature superconductors (HTSs)—materials that can be used without conventional liquid-helium cooling to 4.2 K. Herein, we demonstrate that 40-K-class metallic HTS magnesium diboride (MgB{sub 2}) makes an excellent permanent bulk magnet, maintaining 3 T at 20 K for 1 week with an extremely high stability (<0.1 ppm/h). The magnetic field trapped in this magnet is uniformly distributed, as for single-crystalline neodymium-iron-boron. Magnetic hysteresis loop of the MgB{sub 2} permanent bulk magnet was determined. Because MgB{sub 2} is a simple-binary-line compound that does not contain rare-earth metals, polycrystalline bulk material can be industrially fabricated at low cost and with high yield to serve as strong magnets that are compatible with conventional compact cryocoolers, making MgB{sub 2} bulks promising for the next generation of Tesla-class permanent-magnet applications.

Authors:
 [1];  [2]; ;  [3];  [1]
  1. The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656 (Japan)
  2. (Japan)
  3. Railway Technical Research Institute, 2-8-38 Hikari, Kokubunji, Tokyo 185-8540 (Japan)
Publication Date:
OSTI Identifier:
22311152
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 3; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BORON COMPOUNDS; CURRENTS; HIGH-TC SUPERCONDUCTORS; HYSTERESIS; IRON COMPOUNDS; MAGNESIUM BORIDES; MAGNETIC FIELDS; MONOCRYSTALS; NEODYMIUM COMPOUNDS; NMR IMAGING; PERMANENT MAGNETS; POLYCRYSTALS; SHORTAGES; STABILITY; TEMPERATURE RANGE 0013-0065 K; TRAPPING

Citation Formats

Yamamoto, Akiyasu, E-mail: yamamoto@appchem.t.u-tokyo.ac.jp, JST-PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Ishihara, Atsushi, Tomita, Masaru, and Kishio, Kohji. Permanent magnet with MgB{sub 2} bulk superconductor. United States: N. p., 2014. Web. doi:10.1063/1.4890724.
Yamamoto, Akiyasu, E-mail: yamamoto@appchem.t.u-tokyo.ac.jp, JST-PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Ishihara, Atsushi, Tomita, Masaru, & Kishio, Kohji. Permanent magnet with MgB{sub 2} bulk superconductor. United States. doi:10.1063/1.4890724.
Yamamoto, Akiyasu, E-mail: yamamoto@appchem.t.u-tokyo.ac.jp, JST-PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Ishihara, Atsushi, Tomita, Masaru, and Kishio, Kohji. Mon . "Permanent magnet with MgB{sub 2} bulk superconductor". United States. doi:10.1063/1.4890724.
@article{osti_22311152,
title = {Permanent magnet with MgB{sub 2} bulk superconductor},
author = {Yamamoto, Akiyasu, E-mail: yamamoto@appchem.t.u-tokyo.ac.jp and JST-PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012 and Ishihara, Atsushi and Tomita, Masaru and Kishio, Kohji},
abstractNote = {Superconductors with persistent zero-resistance currents serve as permanent magnets for high-field applications requiring a strong and stable magnetic field, such as magnetic resonance imaging. The recent global helium shortage has quickened research into high-temperature superconductors (HTSs)—materials that can be used without conventional liquid-helium cooling to 4.2 K. Herein, we demonstrate that 40-K-class metallic HTS magnesium diboride (MgB{sub 2}) makes an excellent permanent bulk magnet, maintaining 3 T at 20 K for 1 week with an extremely high stability (<0.1 ppm/h). The magnetic field trapped in this magnet is uniformly distributed, as for single-crystalline neodymium-iron-boron. Magnetic hysteresis loop of the MgB{sub 2} permanent bulk magnet was determined. Because MgB{sub 2} is a simple-binary-line compound that does not contain rare-earth metals, polycrystalline bulk material can be industrially fabricated at low cost and with high yield to serve as strong magnets that are compatible with conventional compact cryocoolers, making MgB{sub 2} bulks promising for the next generation of Tesla-class permanent-magnet applications.},
doi = {10.1063/1.4890724},
journal = {Applied Physics Letters},
number = 3,
volume = 105,
place = {United States},
year = {Mon Jul 21 00:00:00 EDT 2014},
month = {Mon Jul 21 00:00:00 EDT 2014}
}