Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 32: Postersession II: Spinstruct./Phase Trans. (1-10); Spinelectronics (11-15); Thin Films (16 - 36); Particles/Clusters (37-45); Multiferroics (46-54); Spindynamics/Spin Torque (55 - 76); Post Deadlines (77-79)

MA 32.44: Poster

Freitag, 29. Februar 2008, 11:15–14:00, Poster E

Fabrications and Detections of Biosensors Based on Giant Magneto-Resistance — •Ning-Ning Liu, Karsten Rott, Alexander Weddemann, Inga Ennen, Günter Reiss, and Andreas Hütten — Thin Films and Physics of Nanostructures, Department of Physics, Bielefeld University, 33501 Bielefeld, Germany

Giant magneto-resistance (GMR) materials, which are widely used for read-heads and are good candidates for sensors, attracted more and more peoples. The objective of this contribution is to present a biosensor chip for single molecule detection. In this work, the fabrications of Copper/Permalloy and Copper/Cobalt multilayered GMR-sensors-chips employing e-beam lithography have been reported. 1µm sized Dynal MyOne beads have been used for the first detection. The design of the GMR sensor as well as the resulting GMR characteristics have shown and discussed.

Controlling bead coverage on the GMR sensors a calibration curve GMR versus relative coverage of Co nanoparticle has been determined. The sensor output signal linearly depends on the number of beads and single molecule detection could be demonstrated. We will show the characteristics of this biosensor chip for detecting relatively small magnetic nanoparticles, e.g., 5 to 15 nm sized Cobalt nanoparticles.

Physical aspect and possibilities related to the integration of this biosensor into the fluidic environment will be discussed in detail as well.