A half-ring GMR sensor for detection of magnetic beads immobilized on a circular micro-trap

C. P. Gooneratne*, C. Liang, Artur Useinov, J. Kosel, I. Giouroudi

*此作品的通信作者

研究成果: Conference contribution同行評審

1 引文 斯高帕斯(Scopus)

摘要

Utilizing magnetic principles in biological immunoassays is an attractive option given its ability to remotely and non-invasively manipulate and detect cells tagged with micro/nano size superparamagnetic type beads and due to the fact that even the most complex biological immunoassays will have very little magnetic effect. The presence of magnetic beads can be detected by a magnetic sensor which quantifies the amount of target cells present in the immunoassay. In order to increase the detection rate a circular conducting micro-trap is employed to attract, trap and transport the magnetic beads to the sensing area. In this research we propose a half-ring spin valve type giant magnetoresistance (GMR) sensor for the measurement of stray fields produced by 2 μm magnetic beads which are around the circular micro-trap. A couple of half-ring GMR sensors can be used to cover the entire circular border width, in order to detect the majority of the immobilized magnetic beads. Analytical and numerical analysis leading towards the fabrication of the half-ring GMR sensor are presented. DC characterization of the fabricated sensor showed a magnetoresistance of 5.9 %. Experimental results showed that the half-ring GMR sensor detected the presence of 2 μm magnetic beads. Hence, half-ring GMR sensors integrated with a circular micro-trap have great potential to be used as an effective disease diagnostic device.

原文English
主出版物標題2011 5th International Conference on Sensing Technology, ICST 2011
頁面106-111
頁數6
DOIs
出版狀態Published - 1 12月 2011
事件2011 5th International Conference on Sensing Technology, ICST 2011 - Palmerston North, New Zealand
持續時間: 28 11月 20111 12月 2011

出版系列

名字Proceedings of the International Conference on Sensing Technology, ICST
ISSN(列印)2156-8065
ISSN(電子)2156-8073

Conference

Conference2011 5th International Conference on Sensing Technology, ICST 2011
國家/地區New Zealand
城市Palmerston North
期間28/11/111/12/11

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