Magnetic properties of superconducting YBa2Cu3O x permanent magnets prepared by the melt process

S. Gotoh, Masato Murakami, H. Fujimoto, N. Koshizuka

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Demagnetizing curves after field cooling were measured in the melt processed YBa2Cu3Ox superconductors using a vibrating sample magnetometer and a SQUID magnetometer. The curves showed that the samples worked as strong bulk permanent magnets. This is attributed to the strong flux pinning of the bulk superconductors and is well explained in terms of the Bean-London model. The magnetic properties of the permanent magnet can be continuously changed using the field-cooling technique. The magnet properties of the melt-powder-melt-growth processed YBa2Cu3O x with 1.5 mm thickness obtained at 5 K after field cooling in 10 kOe are as follows: the residual flux densities Br are 9.6 kG (H∥ c) and 8.5 kG (H⊥ c); the coercive forces bHc are 33 kOe (H∥ c) and 17 kOe (H⊥ c); and the maximum energy product, (BH) max, are 110 MGOe (H∥ c) and 49 MGOe (H⊥ c).

Original languageEnglish
Pages (from-to)2404-2410
Number of pages7
JournalJournal of Applied Physics
Volume72
Issue number6
DOIs
Publication statusPublished - 1992
Externally publishedYes

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permanent magnets
magnetic properties
cooling
magnetometers
flux pinning
curves
magnets
flux density
products
energy

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Magnetic properties of superconducting YBa2Cu3O x permanent magnets prepared by the melt process. / Gotoh, S.; Murakami, Masato; Fujimoto, H.; Koshizuka, N.

In: Journal of Applied Physics, Vol. 72, No. 6, 1992, p. 2404-2410.

Research output: Contribution to journalArticle

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AB - Demagnetizing curves after field cooling were measured in the melt processed YBa2Cu3Ox superconductors using a vibrating sample magnetometer and a SQUID magnetometer. The curves showed that the samples worked as strong bulk permanent magnets. This is attributed to the strong flux pinning of the bulk superconductors and is well explained in terms of the Bean-London model. The magnetic properties of the permanent magnet can be continuously changed using the field-cooling technique. The magnet properties of the melt-powder-melt-growth processed YBa2Cu3O x with 1.5 mm thickness obtained at 5 K after field cooling in 10 kOe are as follows: the residual flux densities Br are 9.6 kG (H∥ c) and 8.5 kG (H⊥ c); the coercive forces bHc are 33 kOe (H∥ c) and 17 kOe (H⊥ c); and the maximum energy product, (BH) max, are 110 MGOe (H∥ c) and 49 MGOe (H⊥ c).

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