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Hideo Itozaki,Tadayuki Hayashi 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.5I
A SQUID microscope has been developed to observe fine magnetic fields. A fine needle and a sample vibration method were effective to improve its spatial resolution. The fine needle with a chip diameter of less than a micrometer worked to collect magnetic fluxes at the limited area near the top of the needle chip and showed micrometer spatial resolution of the magnetic field. The sample vibration method was effective for observing static fields, because vibrations modulate a magnetic field and a lock-in amplifier can be used to reduce noises. A finely focused laser was useful for inspecting a solar cell by using the SQUID, because the SQUID could detect the magnetic field of the current induced by the laser. This technique was applied to evaluate the current distribution in a solar cell and to observe a clear grain image in a polycrystalline solar cell.