Bui, Dinh Tu and Le, Khac Quynh and Nguyen, Huu Duc and Do, Thi Huong Giang and Phung, Anh Tuan and Tran, Thi Dung and Cao, Viet Anh (2018) Design Optimization of an Anisotropic Magnetoresistance Sensor for Detection of Magnetic Nanoparticles. Journal of Electronic Materials . ISSN 0361-5235
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Abstract
Recent studies have shown that the magnetic field sensitivity of an anisotropic magnetoresistance (AMR) sensor using a single-layer Ni80Fe20 thin film can be considerably improved by increasing the shape anisotropy of the film. In this work, an effective approach for improving the sensitivity and reducing the magnetic coercive field as well as the thermal noise contribution in an AMR Wheatstone bridge sensor is proposed by combining multiple resistors in the series–parallel combination circuits. Four different AMR sensor designs, consisting of a single resistor, three and five resistors in series and six resistors in series–parallel connection, were fabricated by using Ta (10 nm)/Ni80Fe20 (5 nm)/Ta (10 nm) films grown on thermally oxidized Si substrates under the presence and the absence of a biasing magnetic field (900 Oe). The results showed that the sensors based on series–parallel combination gain a magnetic sensitivity (SH) 1.72 times higher than that of the sensor based on the series connection. This optimized sensor has improved the capacity of detecting various oncentrations of magnetic nanoparticles with a detection limit of magnetic moments estimated to be about 0.56 microemu
| Item Type: | Article |
|---|---|
| Subjects: | Engineering Physics |
| Divisions: | Faculty of Engineering Physics and Nanotechnology (FEPN) |
| Depositing User: | Dinh Tu Bui |
| Date Deposited: | 19 Dec 2018 09:39 |
| Last Modified: | 21 Dec 2018 01:10 |
| URI: | http://eprints.uet.vnu.edu.vn/eprints/id/eprint/3346 |
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