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Title: Detection of a single magnetic dot using a Planar Hall sensor
Authors: Chui, K.M.
Adeyeye, A.O. 
Li, M.-H.
Keywords: Magnetic beads
Magnetic biosensors
Planar Hall effect
Single micro-bead detection
Issue Date: Mar-2007
Citation: Chui, K.M., Adeyeye, A.O., Li, M.-H. (2007-03). Detection of a single magnetic dot using a Planar Hall sensor. Journal of Magnetism and Magnetic Materials 310 (2 SUPPL. PART 3) : e992-e993. ScholarBank@NUS Repository.
Abstract: We have successfully demonstrated the detection of pseudo-magnetic beads placed on top of 4×4 μm2 and 5×5 μm2 Planar Hall trilayer (Si/Co10 nm /Cu2 nm /NiFe10 nm) sensors. The sensor and the pseudo-magnetic beads were fabricated using a combination of e-beam and optical lithography techniques. Magneto-transport measurements detect the presence of dots placed on top of the PHE junction, even to the limit of single-dot. We observed that the PHE response is very sensitive to changes in the density of coverage of the sensing area with pseudo-magnetic beads. We attribute this effect to the direct coupling between the dots and the sensing layer below. © 2006 Elsevier B.V. All rights reserved.
Source Title: Journal of Magnetism and Magnetic Materials
ISSN: 03048853
DOI: 10.1016/j.jmmm.2006.10.1034
Appears in Collections:Staff Publications

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