Magnetic Microscopy for Nondestructive Characterization of Local Critical Current Distribution in MgB2 Wires With Magnetic Sheath Materials

Kohei Higashikawa, Hiroshi Tatara, Masayoshi Inoue, Shujun Ye, Akiyoshi Matsumoto, Hiroaki Kumakura, Takanobu Kiss

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


We have developed a method for the nondestructive characterization of critical current distribution in MgB2 wires based on magnetic microscopy. This method enables us to evaluate critical currents of MgB2 wires, even in the condition where they become too large to be measured by the conventional four-probe transport method from the viewpoint of heat generation and/or the limitation from the measurement system. Furthermore, the inhomogeneity in local critical currents in the wires can be also estimated, while it is difficult for the conventional magnetization method, using a SQUID magnetometer. In this paper, by overcoming the influence of magnetic sheath materials, which are widely used for recent high-performance MgB2 wires, we have succeeded in developing a nondestructive method for the characterization of longitudinal distribution of local critical currents in them. This method will become a fundamental technique for a nondestructive product testing at the stage of full-fledged commercial production in the future.

Original languageEnglish
Article number7378317
JournalIEEE Transactions on Applied Superconductivity
Issue number3
Publication statusPublished - 2016 Apr
Externally publishedYes


  • Critical current
  • local homogeneity
  • MgB
  • scanning Hall-probe microscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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