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자료유형
학술저널
저자정보
Jung, Y. (Korea Science Academy of Korea Advanced Institute of Science and Technology) Go, S.J. (Korea Science Academy of Korea Advanced Institute of Science and Technology) Joo, H.T. (Korea Science Academy of Korea Advanced Institute of Science and Technology) Lee, Y.J. (Neutron Utilization Technology Division, Korea Atomic Energy Research Institute) Park, S.D. (Neutron Utilization Technology Division, Korea Atomic Energy Research Institute) Jun, B.H. (Neutron Utilization Technology Division, Korea Atomic Energy Research Institute) Kim, C.J. (Neutron Utilization Technology Division, Korea Atomic Energy Research Institute)
저널정보
한국초전도저온학회 한국초전도·저온공학회논문지 한국초전도·저온공학회논문지 제19권 제1호
발행연도
2017.1
수록면
30 - 35 (6page)

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The effects of the crystallographic orientation and sample thickness on the magnetic levitation forces (F) and trapped magnetic field (B) of single grain YBCO bulk superconductors were examined. Single grain YBCO samples with a (001), (110) or (100) surface were used as the test samples. The samples used for the force-distance (F-d) measurement were cooled at 77 K without a magnetic field (zero field cooling, ZFC), whereas the samples used for the B measurement were cooled under the external magnetic field of a Nd-B-Fe permanent magnet (field cooling, FC). It was found that F and B of the (001) surface were higher than those of the (110) or (100) surface, which is attributed to the higher critical current density ($J_c$) of the (001) surface. For the (001) samples with t=5-18 mm, the maximum magnetic levitation forces ($F_{max}s$) of the ZFC samples were larger than 40 N. About 80% of the applied magnetic field was trapped in the FC samples. However, the F and B decreased rapidly as t decreased below 5 mm. There exists a critical sample thickness (t=5 mm for the experimental condition of this study) for maintaining the large levitation/trapping properties, which is dependent on the material properties and magnitude of the external magnetic fields.

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