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MA: Fachverband Magnetismus

MA 24: FV Internal Symposium in honour of Nobelprice 2007 to Peter Grünberg and Albert Fert

MA 24.3: Hauptvortrag

Donnerstag, 28. Februar 2008, 10:30–11:00, EB 301

Magnetoresistive Sensors and Magnetic Nanoparticles for Biotechnology — •Günter Reiss, Andreas Hütten, Inga Ênnen, Alexander Weddemann, Andy Thomas, and Jan Schmalhorst — Bielefeld University, Physics Department, P.O. Box 100131, 33501 Bielefeld, Germany

Detection as well as manipulation of biomolecules on one technological platform is important for both basic research as well as for numerous applications. The discovery of the Giant Magnetoresistance enabled the vision of a magnetoresistive Biochip: The detection of small magnetic carriers1 with tailored magnetoresistive sensors can create a completely electronic (bio-) chip capable of detecting antibodies or DNA fragments2. Moreover, this system would be compatibel with important developments in microelectronics, namely read heads and MRAM. Different configurations are discussed and the results for GMR sensors are compared to an analysis of the same systems marked with fluorescence dyes. This shows, that down to a low concentration of, e.g., DNA molecules, the magnetoresistive technique is competitive to nowadays standard analysis methods. The capability of the Tunneling Magnetoresistance sensors to detect even single markers as well as on chip manipulation of the carriers are additionally demonstrated.

1 G. Reiss, A. Hütten, Nature Materials News and Views, 4 (2005) 725

2 W. Schepper et.al., Physica B-Condens. Mat. 372 (2006) 337