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A scanning superconducting quantum interference device microscope for room temperature samples |
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| Authors: | Ding Hong-Sheng Zhang Feng-Hui Yan Xiao-Ming Han Shi-Ji Dong Shi-Ying Yu Hong-Wei Chen Geng-Hua and He Yu-Sheng |
| Affiliation: | Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080, China; Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; Graduate School, Chinese Academy of Sciences, Beijing 100080, China;Department of Physcs, University of Science and Technology, Beijing 100083, China |
| Abstract: | We have constructed a scanning low-Tc superconducting quantum interference device (SQUID) microscope, in which the SQUID is mounted on the lower end of a copper rod and cooled to liquid helium temperature. There is a 65μm thick sapphire window under the SQUID. The sample at room temperature underneath the window can be scanned to produce magnetic images. The microscope has a spatial resolution of 100－150μm and a magnetic field sensitivity of 3－60pT/\sqrt{Hz} in a magnetically unshielded environment. We have used this scanning SQUID microscope to measure various room temperature samples. |
| Keywords: | SQUID microscope magnetism measurement |
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