In-line monitoring of magnetic microparticles using GMR sensors in microfluidic systems

Naga S. Korivi; Jin-Woo Choi

doi:10.1117/12.591270

22 January 2005 In-line monitoring of magnetic microparticles using GMR sensors in microfluidic systems

Naga S. Korivi, Jin-Woo Choi

Proceedings Volume 5718, Microfluidics, BioMEMS, and Medical Microsystems III; (2005) https://doi.org/10.1117/12.591270
Event: MOEMS-MEMS Micro and Nanofabrication, 2005, San Jose, California, United States

Abstract

This paper presents the development of a giant magnetoresistive (GMR) sensor array for the in-line monitoring of magnetic microparticles in microfluidic systems. The GMR sensors employ Ni₈₀Fe₂₀/Cu multilayers with the thickness of each layer controlled between 1 nm to 3 nm, achieving a maximum magnetoresistance (MR) value of 16%. The multilayer films exhibit specific magnetoresistive properties that can be employed for the in-line detection of particular biological molecules bound to magnetic microparticles. The electrical current variations in the developed GMR sensor array in the presence of magnetic microparticles show that the GMR sensor array can be used for real-time monitoring of magnetic microparticles in microfluidic systems.

Citation Download Citation

Naga S. Korivi and Jin-Woo Choi "In-line monitoring of magnetic microparticles using GMR sensors in microfluidic systems", Proc. SPIE 5718, Microfluidics, BioMEMS, and Medical Microsystems III, (22 January 2005); https://doi.org/10.1117/12.591270

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