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Saw-tooth pattern from flux jumps observed by high resolution M-H curves in MgB2 thin films

Source: J. Appl. Phys. 108, 033909 (2010); doi:10.1063/1.3457674

Published 6 August 2010

KEYWORDS and PACS
Keywords
PACS
  • 74.25.Wx
    Vortex pinning (includes mechanisms and flux creep)
  • 74.25.Ha
    Magnetic properties of superconductors
  • 74.78.-w
    Superconducting films and low-dimensional structures
  • YEAR: 2010
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Jae-Yeap Lee,1 Hu-Jong Lee,1 Myung-Hwa Jung,2 Sung-Ik Lee,2 Eun-Mi Choi,3 and W. N. Kang3
1Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
2Department of Physics, National Creative Research Initiative Center for Superconductivity, Sogang University, Seoul 100-611, Republic of Korea
3Department of Physics and BK21 Division, Sungkyunkwan University, Suwon 440-746, Republic of Korea
While flux jumps have been observed in the magnetic hysteresis loops of superconductors, a saw-tooth pattern of the flux jump is known to appear only in a bulk superconductor. But in this study, we were able to observe the saw-tooth pattern in MgB2 thin film with the careful data acquisition method enhancing the data taking capability and report the details of the distribution of the field interval between jumps Bfj, and the size of the flux jump, Mfj. The theory based on Bean's model in the adiabatic approach was adapted and it was compared with experimental results. In addition, we observe the cross-over between the saw-tooth pattern and a rounded saw-tooth pattern, as a byproduct. A patterns diagram of the vortex jump was drawn on the H-T plane. ©2010 American Institute of Physics
History: Received 23 November 2009; accepted 1 June 2010; published 6 August 2010
Permalink: http://link.aip.org/link/?JAPIAU/108/033909/1

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