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

我们已经开发了一种高Tc（HTS）STM-SQUID显微镜，用于冷却样品，包括HTS材料，磁性材料等。这种STM-SQUID混合显微镜通过STM反馈控制，可以在不破坏磁探针的情况下同时观察样品表面的形貌和磁图像，我们还研制了具有精细压电载物台的STM-SQUID显微镜。低温超导SQUID和高温超导SQUID都可以用作磁传感器。用这种方法可以测量出超导薄膜的细点结构的磁象。在LTS SQUID的情况下，基于铱的LTS DC SQUID磁力计/梯度计和三轴压电台附接到插入液氦容器中的测量棒。同时作为磁性和STM尖端的高磁导率探针靠近样品。

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.