Title :
Microfluidic microsystem for magnetic sensing of nanoparticles with Giant Magneto-Impedance technology
Author :
Denoual, M. ; Harnois, M. ; Saez, S. ; Dolabdjian, C. ; Senez, V.
Author_Institution :
Basse-Normandie GREYC-ENSICAEN, Univ. of Caen, Caen, France
Abstract :
We have fabricated a microfluidic microsystem integrating a Giant Magneto-Impedance wire sensor that successfully detected the passage of magnetic nanoparticules in liquid medium. Giant Magneto-Impedance microwire sensors consisted in CoFeSiBNb alloy, 40 μm diameter and 1 cm long wires. By magnetizing the magnetic nanoparticles in the liquid perpendicularly to the sensitive axis of the Giant Magneto-Impedance microwire sensor, we have observed magneto-impedance signal variations induced by the magnetic dipole field from the magnetic nanoparticles. A peak detector was used to measure the voltage signal due to the magneto-impedance variations. The voltage signal was subsequently demodulated by a lock-in amplifier.
Keywords :
amplifiers; boron alloys; cobalt alloys; giant magnetoresistance; iron alloys; magnetic particles; magnetic sensors; microfluidics; microsensors; nanoparticles; niobium alloys; silicon alloys; CoFeSiBNb; giant magneto-impedance microwire sensor technology; lock-in amplifier; magnetic dipole field; magnetic sensing; microfluidic microsystem; nanoparticles; peak detector; Magnetic field measurement; Magnetic liquids; Magnetization; Microchannel; Nanoparticles; Perpendicular magnetic recording; Saturation magnetization; Giant Magneto-Impedance (GMI); magnetic nanoparticles; magnetic sensor; microfluidic; microsystem;
Conference_Titel :
Solid-State Sensors, Actuators and Microsystems Conference (TRANSDUCERS), 2011 16th International
Conference_Location :
Beijing
Print_ISBN :
978-1-4577-0157-3
DOI :
10.1109/TRANSDUCERS.2011.5969140
