Spin Valve Ring Sensors for Superparamagnetic Bead Detections

We have fabricated spin valve ring shape sensors for the detection of micrometer size magnetic beads. By using a ring shape spin valve sensors, we were able to detect the presence of 2.8 mum size magnetic beads by direct measurement of magnetic dipole fields from the magnetic beads. The abrupt trans...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2009-06, Vol.45 (6), p.2730-2732
Main Authors: Jeong Dae Suh, Jeong Dae Suh, Sang Don Jung, Sang Don Jung, Myung Ae Chung, Myung Ae Chung
Format: Article
Language:English
Subjects:
Anisotropic magnetoresistance
Beads
Biomolecules
Biosensors
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Giant magnetoresistance
Labels
Magnetic anisotropy
Magnetic bead detection
magnetic biosensor
Magnetic dipoles
Magnetic sensors
Magnetism
Materials science
Micrometers
Optical sensors
Other topics in materials science
Perpendicular magnetic anisotropy
Physics
ring shape sensor
Sensor phenomena and characterization
Sensors
Shape
spin vale sensor
Spin valves
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Description
Summary:We have fabricated spin valve ring shape sensors for the detection of micrometer size magnetic beads. By using a ring shape spin valve sensors, we were able to detect the presence of 2.8 mum size magnetic beads by direct measurement of magnetic dipole fields from the magnetic beads. The abrupt transition position of ring sensor transfer curves was changed from the 5 Oe to -10 Oe due to the presence of the 12 magnetic beads. It was also found that the sensitivities of ring sensors without and with magnetic beads were obtained about 0.11 mV/Oe and 0.08 mV/Oe, respectively. Variations of the abrupt transition position and maximum output signal were explained by the magnetic bead stray field effect. Our results shows that ring shape spin valve magnetic sensors are promising for the detection of biomolecules with magnetic labels.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2009.2020539