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Detection of magnetic nanoparticles using simple AMR sensors in Wheatstone bridge
Journal of Science: Advanced Materials and Devices
Wheatstone bridges incorporating a serially connected ensemble of simple AMR elements of Ni 80 Fe 20 film were produced, targeting an application of a pinned magnetic field along the sensing magnetoresistor length. For the optimal dimension, the magnetoresistive element with length l ¼ 4 mm, width w ¼ 150 mm and thickness t ¼ 5 nm still shows a rather modest AMR ratio (of about 0.85% only). However, the resulting bridge exhibits a sensitivity as large as 2.15 mV/Oe. This is according to adoi:10.1016/j.jsamd.2016.04.006 fatcat:7pzsbbvw2bdoxddc42bgbupou4