Temperature Dependence of the Flux Jump Upper Threshold Field in MgB_2 Thin Films(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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概要

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• The origin of the magnetic flux noise in MgB_2 thin films is believed to be a thermo-magnetic instability, where the local dissipation created by vortex motion leads to reduced pinning, and forms a positive feedback loop which can develop into a thermo-magnetic runaway. However, only the lower threshold field (H_1) for the appearance of this noise was investigated by the magneto-optics (MO) technique due to the field limit of the MO indicator. In this paper, we report the upper threshold field, (H_u) which is successfully obtained by different technique using a vibrating sample magnetometer while varying temperature and the field interval. After the analysis of magnetic hysteresis curves, we found that H_u is strongly depends on sample geometry and temperature. This is consistent with the phenomenological model mentioned above.

• 一般社団法人日本物理学会の論文
• 2008-10-15

著者

• Lee Sung-ik

  National Creative Research Initiative Center For Superconductivity And Department Of Physics Pohang

• Kim Kee

  Cscmr And Fprd School Of Physics And Astronomy Seoul National University

• Choi Eun-mi

  National Creative Research Initiative Center For Superconductivity And Department Of Physics Pohang

• Olsen A.

  Department Of Physics University Of Oslo

• Cho Moo-hyun

  National Creative Research Initiative Center For Superconductivity Department Of Physics Pohang Univ

• Lee Jae-yeap

  National Creative Research Initiative Center For Superconductivity Department Of Physics Pohang Univ

• Han Young-hee

  Superconduction Group Korea Electric Power Research Institute

• Lee Hyun-sook

  National Creative Research Initiative Center For Superconductivity Department Of Physics Pohang Univ

• Johansen T.

  Department Of Physics Univ. Of Oslo

• Oh Y.

  Cscmr And Fprd School Of Physics And Astronomy Seoul National University

• Sung T.

  Superconduction Group Korea Electric Power Research Institute

関連論文

• Temperature Dependence of the Flux Jump Upper Threshold Field in MgB_2 Thin Films(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
• Specific Heat of Field-dependent Magnetic Orderings in HoNi_2B_2C
• Magneto-optical Indicator Garnet Films Grown by Metal-organic Decomposition Method(MORIS 2007 Workshop on Thermal & Optical Magneitc Materials and Devices)
• Optical Writing and Erasing of Magnetic Domain Patterns on a Ferrite-Garnet Film(MORIS 2007 Workshop on Thermal & Optical Magneitc Materials and Devices)
• Microscopic Study of Dendritic Avalanches in MgB2 Thin Films of Various Widths
• Temperature Dependence of the Flux Jump Upper Threshold Field in MgB_2 Thin Films(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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