A simple ac bridge for detecting small resistance change

A simple ac resistance bridge is proposed. The stability of the design is better than 10(-6), which is especially suitable for detecting tiny changes of resistance. An example of magnetoresistance measurement for a 220 nm Au film shows the good performance of the bridge. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3202284]

973 Project of Ministry of Science and Technology of China Knowledge Innovation Project of Chinese Academy of Sciences. This work is supported by the 973 Project of Ministry of Science and Technology of China and the Knowledge Innovation Project of Chinese Academy of Sciences.