磁気顕微鏡による磁束観測

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  • Scanning SQUID Microscopy for Magnetic Flux Systems
  • ジキ ケンビキョウ ニ ヨル ジソク カンソク

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Recently, vortices confined into micro-scale superconductors with shapes like a disk, triangle, square, etc., have attracted much attention because of the quantum phase transition of the self-organized vortex arrangement occurring within such geometrical constraints. Such a transition can be observed using a scanning SQUID microscope with high spatial resolution. We have successfully improved spatial resolution by incorporating a microfabrication technique that reduces both the size of the pick-up coil of the micro DC-SQUID and the standoff distance between the pick-up coil and the sample surface. Using this microscope, we have studied vortex arrangements in micro-scale superconductors made of Nb and YBa2Cu3O7−δ films with various sizes and geometrical shapes. A peculiar oscillating behavior of diamagnetic magnetization corresponding to the particular vortex state was observed.

収録刊行物

  • 低温工学

    低温工学 38 (9), 485-492, 2003

    公益社団法人 低温工学・超電導学会 (旧 社団法人 低温工学協会)

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