Dresden 2009 – scientific programme

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MA: Fachverband Magnetismus

MA 14: Poster Ib: Magnetic Materials (1-14); Micro Magnetism/Computational Mag. (15-17); Surface Magnetism (18-22); Spin Structures/Phase Transitions (23-25)

MA 14.17: Poster

Tuesday, March 24, 2009, 10:15–13:00, P1B

Investigation of the Dynamic Behaviour of Thin Magnetic Layers under the Influence of Magnetic Particles — •Alexander Weddemann, Camelia Albon, and Andreas Hütten — Bielefeld University, Universitätsstraße 25, D-33615 Bielefeld, Germany

Magnetic particles on the micro- or nanoscale have a growing number of different applications in many different physical, chemical or medical fields, e.g. as contrast agents or drug carriers. Because of their magnetic stray field such particles interact with thin magnetic layers, making it possible to detect them with the help of GMR- or TMR-sensor arrays. However, the obtained signals strongly depend on the particle size, the distance from the sensor as well as the number of particles above the sensor. Also material properties, especially, if superparamagnetic or ferromagnetic particles are to be detected, have a strong influence on the results. The different dependencies are investigated systematically. Furthermore, dynamic measurements of particles moving close to the sensors are discussed.

Micromagnetic simulations solving Landau-Lifschitz-Gilbert and Brown equation for thin films are compared to experimental results.