High-resolution magnetic measurement for superconducting/magnetic materials using a STM-SQUID hybrid microscope

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We have developed a high Tc (HTS) STM-SQUID microscope for cooled samples including HTS materials, magnetic materials, etc. A high-permeability probe also performs as an STM tip. This STM-SQUID hybrid microscope can be used to observe the topography of a sample surface and the magnetic image at the same time without destroying the magnetic probe by using STM feedback control.We have also developed STM-SQUID microscope with fine piezo stage. Both low Tc (LTS) SQUID and HTS SQUID can be used as a magnetic sensor. A magnetic image of fine dot structure made of superconducting film could be measured. In case of LTS SQUID, a niobium-based LTS DC SQUID magnetometer/gradiometer and a three-axis piezo stage are attached to a measurement rod inserted in liquid helium container. A high-permeability probe as both magnetic and STM tip is close to a sample.