Earticle

초록

영어

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 (Jc) of the (001) surface. For the (001) samples with t=5–18 mm, the maximum magnetic levitation forces (Fmaxs) 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.

목차

Abstract
 1. INTRODUCTION
 2. EXPERIMENTAL PROCEDURE
 3. RESULTS AND DISCUSSION
  3.1. Crystallographic orientation vs. magnetic levitation force
  3.2. Crystallographic orientation vs. trapped magnetic field
  3.3. Sample thickness vs. magnetic levitation forces
  3.4. Sample thickness vs. trapped magnetic field
 4. CONCLUSIONS
 ACKNOWLEDGEMENTS
 REFERENCES

키워드

저자

• Y. Jung [ Korea Science Academy of Korea Advanced Institute of Science and Technology, Pusan, Korea ]
• S. J. Go [ Korea Science Academy of Korea Advanced Institute of Science and Technology, Pusan, Korea ]
• H. T. Joo [ Korea Science Academy of Korea Advanced Institute of Science and Technology, Pusan, Korea ]
• Y. J. Lee [ Neutron Utilization Technology Division, Korea Atomic Energy Research Institute, Sungkyunkwan University, Suwon, Korea ]
• S.-D. Park [ Neutron Utilization Technology Division, Korea Atomic Energy Research Institute, Daejeon, Korea ]
• B.-H. Jun [ Neutron Utilization Technology Division, Korea Atomic Energy Research Institute, Daejeon, Korea ]
• C.-J. Kim [ Neutron Utilization Technology Division, Korea Atomic Energy Research Institute, Daejeon, Korea ] Corresponding author

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  한국초전도·저온논문지 (구 한국초전도저온공학회논문지) [Progress in Superconductivity and Cryogenics]

• 간기

  계간

• pISSN

  1229-3008

• eISSN

  2287-6251

• 수록기간

  1999~2026

• 등재여부

  KCI 등재,SCOPUS

• 십진분류

  KDC 427 DDC 537