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 YBa2Cu3Ox 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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15 September 1992
Research Article|
September 15 1992
Magnetic properties of superconducting YBa2Cu3Ox permanent magnets prepared by the melt process Available to Purchase
S. Gotoh;
S. Gotoh
Superconductivity Research Laboratory, ISTEC, 1‐10‐13 Shinonome, Koto‐ku, Tokyo 135, Japan
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M. Murakami;
M. Murakami
Superconductivity Research Laboratory, ISTEC, 1‐10‐13 Shinonome, Koto‐ku, Tokyo 135, Japan
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H. Fujimoto;
H. Fujimoto
Superconductivity Research Laboratory, ISTEC, 1‐10‐13 Shinonome, Koto‐ku, Tokyo 135, Japan
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N. Koshizuka
N. Koshizuka
Superconductivity Research Laboratory, ISTEC, 1‐10‐13 Shinonome, Koto‐ku, Tokyo 135, Japan
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S. Gotoh
Superconductivity Research Laboratory, ISTEC, 1‐10‐13 Shinonome, Koto‐ku, Tokyo 135, Japan
M. Murakami
Superconductivity Research Laboratory, ISTEC, 1‐10‐13 Shinonome, Koto‐ku, Tokyo 135, Japan
H. Fujimoto
Superconductivity Research Laboratory, ISTEC, 1‐10‐13 Shinonome, Koto‐ku, Tokyo 135, Japan
N. Koshizuka
Superconductivity Research Laboratory, ISTEC, 1‐10‐13 Shinonome, Koto‐ku, Tokyo 135, Japan
J. Appl. Phys. 72, 2404–2410 (1992)
Article history
Received:
January 22 1992
Accepted:
June 01 1992
Citation
S. Gotoh, M. Murakami, H. Fujimoto, N. Koshizuka; Magnetic properties of superconducting YBa2Cu3Ox permanent magnets prepared by the melt process. J. Appl. Phys. 15 September 1992; 72 (6): 2404–2410. https://doi.org/10.1063/1.351584
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