Field trapping and magnetic levitation performances of large single-grain Gd–Ba–Cu–O at different temperatures
✍ Scribed by S. Nariki; M. Fujikura; N. Sakai; I. Hirabayashi; M. Murakami
- Publisher
- Elsevier Science
- Year
- 2005
- Tongue
- English
- Weight
- 322 KB
- Volume
- 426-431
- Category
- Article
- ISSN
- 0921-4534
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✦ Synopsis
We measured the temperature dependence of the trapped field and the magnetic levitation force for c-axis-oriented single-grain Gd-Ba-Cu-O bulk samples 48 mm in diameter. Trapped magnetic field of the samples was 2.1-2.2 T at 77 K and increased with decreasing temperature and reached 4.1 T at 70 K, however the sample fractured during the measurements at lower temperatures due to a large electromagnetic force. The reinforcement by a metal ring was effective in improving the mechanical strength. The sample encapsulated in an Al ring could trap a very high magnetic field of 9.0 T at 50 K. In liquid O 2 the Gd-Ba-Cu-O bulk exhibited a trapped field of 0.42 T and a magnetic levitation force about a half value of that in liquid N 2 .