Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 17: Poster Session I

MA 17.10: Poster

Dienstag, 8. März 2016, 09:30–12:30, Poster B1

Manipulation of Magnetic Nanoparticles for Lab-on-Chip systems — Shalini Easwardas, •Benjamin Riedmüller, Florian Ostermaier, and Ulrich Herr — Institut für Mikro- und Nanomaterialien, Ulm, Deutschland

Magnetic nanoparticles are widely used for Lab-on-chip systems. In such applications, biological analytes can be specifically bound to the surface of the magnetic particles. Many of these applications require a highly accurate and controlled manipulation of the particles. A common principle for manipulation is the application of magnetic field gradients by which a force on the particles is generated. Here we show a manipulation technique based on the superposition of field gradients generated by tapered conductor lines and an additional homogeneous magnetic field. By this technique we are able to position single superparamagnetic particles in two dimensions on length scales > 100 um with a precision of < 1 um. Our results show that the short-term fluctuations of the particle as quantified by the mean square displacement (MSD) are strongly influenced by the particle-surface interaction. By analyzing the fluctuations on time scales of several minutes the trap stiffness can be extracted. Combining the experimentally observed trap stiffness with the values predicted from quantitatively modeling the force landscape around the energy minimum of the trap, the magnetic moment of a single superparamagntic particle can be extracted with high precision.