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MA: Fachverband Magnetismus

MA 36: Magnetic Particles and Clusters II

MA 36.10: Talk

Thursday, March 26, 2009, 17:30–17:45, HSZ 401

Highly sensitive detection of magnetic markers by tunneling magnetoresistance sensors — •Camelia Albon, Karsten Rott, and Andreas Hütten — Thin Films and Physics of Nanostructures, Department of Physics, Bielefeld University, P.O. Box 100131, 33501 Bielefeld, Germany

Tunneling magneto-resistance (TMR) sensors are employed in the detection of magnetic markers for biological applications. An array of sensors is constructed by e-beam lithography means and consists of 20 elements placed on an 18.2 micrometer squares area. Each element has the size of 100nm on the transversal axis and 400nm on the longitudinal axis, the distance between two adjacent sensors being 1.2 micrometers. The sensors have been proved to be eligible for the detection of 1 micrometer magnetic beads by providing different detection signals with respect to the bead orientation at the sensor surface. Also, TMR sensors are able to detect the threshold of magnetic coupling between the 14nm Co nanoparticles situated on top of the sensor surface. By integrating the sensors with microchannels technique it has been proved their suitability for real time detection of magnetic markers.