Le, Khac Quynh and Bui, Dinh Tu and Dang, Xuan Dang and Dong, Quoc Viet and Le, Thi Hien and Do, Thi Huong Giang and Nguyen, Huu Duc (2016) Detection of magnetic nanoparticles using simple AMR sensors in Wheatstone bridge. Journal of Science: Advanced Materials and Devices, 1 . pp. 98-102.
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Abstract
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.
| Item Type: | Article |
|---|---|
| Subjects: | Engineering Physics ISI-indexed journals |
| Divisions: | Faculty of Engineering Physics and Nanotechnology (FEPN) |
| Depositing User: | Hien Thi Le |
| Date Deposited: | 31 Dec 2016 10:21 |
| Last Modified: | 31 Dec 2016 10:21 |
| URI: | http://eprints.uet.vnu.edu.vn/eprints/id/eprint/2211 |
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