A scanning superconducting quantum interference device microscope for room temperature samples
Ding Hong-Sheng (丁红胜)abcd, Zhang Feng-Hui (张峰会)b, Yan Xiao-Ming (颜晓明)a, Han Shi-Ji (韩士吉)b, Dong Shi-Ying (董世迎)b, Yu Hong-Wei (于洪伟)b, Chen Geng-Hua (陈赓华)b, He Yu-Sheng (何豫生)b
a Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080, China; b Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; c Graduate School, Chinese Academy of Sciences, Beijing 100080, China; d Department of Physcs, University of Science and Technology, Beijing 100083, China
AbstractWe 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.
Received: 07 June 2002
Revised: 05 July 2002
Accepted manuscript online:
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