Abstract
We have developed a SQUID microscope using a high- T c SQUID sensor. The SQUID sensor is cooled by liquid nitrogen down to 77 K. The distance between the sensor and a sapphire window is less than 100 μm. The distance between a sample and the window along the Z-direction can be adjusted to less than 200 μm manually by monitoring with a CCD camera. A motion controller and a computer interface drive the stage. A SQUID sensor operates at the level near the critical current. A digital multimeter can read a SQUID output voltage coming from a local magnetic field. A sample is scanned in the two dimensions while the SQUID sensor is fixed to the bottom of the liquid nitrogen Dewar. The performance of the SQUID microscope is examined by a regular array of Ni dots. The sample is made by evaporating nickel on to a cover glass with a mask of metallic mesh (17 μm), and then magnetized in a magnetic field of 0.8 T.
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