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Magnetic Spin Valve Sensors with Different Geometry to Magnetic Bead Detection for Biosensor Application

Published online by Cambridge University Press:  26 February 2011

Jeong Dae Suh  and
Myung Ae Chung
Jeong Dae Suh
Affiliation:
jdsuh@etri.re.kr, Electronics and Telecommunications Research Institute, Medical Information Convergence Team, 138 Gajeongno, Daejeon, 305-350, Korea, Republic of
Myung Ae Chung
Affiliation:
machung@etri.re.kr, Electronics and Telecommunications Research Institute, Medical Information Convergence Team, 138 Gajeongno, Daejeon, 305-350, Korea, Republic of
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Abstract

We have demonstrated the use of highly sensitive spin valve sensors for the detection of micron magnetic beads. By using a ring type, cross type, and meander line type sensors, we were able to detect the presence of 2.8 μm size magnetic beads in real time by direct measurement of magnetic dipole fields from magnetic beads. The sensitivity of the ring, cross and meander line sensors were obtained about 50 μV/Oe, 7 μV/Oe, 30 μV/Oe and sensor output signals of 50 μV , 30 μV, 90 μV were obtained in an external applied field of 10 Oe and 1 mA sense current. Our results shows that ring, cross, and meander line shape spin valve sensors are very promising candidates for the detection of biomolecules with magnetic labels.

Keywords

sensormagnetoresistance (magnetic)spintronic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1032: Symposium I – Nanoscale Magnetic Materials and Applications , 2007 , 1032-I14-37
Copyright
Copyright © Materials Research Society 2008

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