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Title: Exchange biased planar hall effect biosensor
Keywords: Magnetic biosensor, planar Hall effect, magnetotransport measurements, sensitivity, exchange bias, annealing
Issue Date: 6-Jun-2007
Citation: CHUI KIAM MING (2007-06-06). Exchange biased planar hall effect biosensor. ScholarBank@NUS Repository.
Abstract: The need for biosensors in todaya??s world is indispensable for its applications in clinical diagnostics and biological warfare. By employing microelectronics technology, magnetic biosensors that are extremely versatile and sensitive can be fabricated and integrated into biochips. In the search of an optimized biosensor, the planar Hall effect (PHE) sensor stands out as an extremely promising candidate. In this thesis, PHE sensors were fabricated using standard optical lithography and thin-film deposition techniques. It was discovered that exchange biased sensors are very sensitive to pseudo-magnetic beads. The sensitivity of the sensors was modified systematically by varying the thickness of the seed layer. The sensors were exceptionally sensitive to real magnetic beads too. The magnetic and transport properties of the trilayer system of the sensors were subsequently studied. Finally, a detailed investigation into the effect of annealing on the system was performed, and temperature dependent transport measurements were carried out as well.
Appears in Collections:Master's Theses (Open)

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