Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 16: Magnetic Particles and Clusters I

MA 16.4: Vortrag

Dienstag, 26. Februar 2008, 11:15–11:30, H 1028

Submicron Tunneling Magnetoresistance Sensors for Detection of Magnetic Nanoparticles — •Camelia Albon, Michael Schilling, Karsten Rott, Günter Reiss, and Andreas Hütten — Thin Films and Physics of Nanostructures, Department of Physics, Bielefeld University, P.O. Box 100131, 33501 Bielefeld, Germany

The application of thin films science in bimolecular field enables the possibility to investigate the processes that gives molecules their identity and specificity.

We will show that the detection of biomolecules attached to magnetic nanoparticles ranging from 14 nanometers to 1 micron can accurately be done by employing tunneling magnetoresistance (TMR) sensors. The general advantage of tunneling magnetoresistance (TMR) sensors is that they can be downscaled without a loss of their resulting TMR amplitude which makes them preferentially suitable for biomolecules detection. Moreover, by using MgO as the tunneling barrier material their sensitivity is highly improved and the detection can be done with increasing precision.

In this work we focus on the development and application of a TMR sensor array for magnetic nanoparticles detection. The sensors consist of 20 elliptical magnetic tunnel junctions distributed on an 18.2 micrometers squares area. Each TMR element in this array has submicron size area and has been pattern by using e-beam lithography techniques.