%A Khac Quynh Le
%A Dinh Tu Bui
%A Xuan Dang Dang
%A Quoc Viet Dong
%A Thi Hien Le
%A Thi Huong Giang Do
%A Huu Duc Nguyen
%J Journal of Science: Advanced Materials and Devices
%T Detection of magnetic nanoparticles using simple AMR sensors in Wheatstone bridge
%X Wheatstone bridges incorporating a serially connected ensemble of simple AMR elements of Ni80Fe20 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  4 µm, width 150 µm and thickness 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 a standard sensitivity of 1.80 mV/V/Oe and a detection limit better than 10_6 emu, which is almost doubled with respect to that in the typical commercial AMR devices and is comparable with Permalloy based PHE sensor. This is suitable to detect the superparamagnetic fluid of 50 nm-Fe3O4-chitosan.
%P 98-102
%V 1
%D 2016
%I Elsevier
%L SisLab2211