Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 18: Magnetic Particles and Clusters

MA 18.8: Talk

Monday, March 16, 2020, 18:30–18:45, HSZ 403

Testing energy landscapes with trapped magnetic beads — •Moritz Quincke, Florian Ostermaier, Isiaka Lukman, Benjamin Riedmüller, and Ulrich Herr — Institut für Funktionelle Nanosysteme, Ulm, Germany

Optical tweezers have been established as a powerful tool for passive microrheology of living cells and single molecule stretching. Magnetic tweezers offer a similar range of achievable force and particle localization, but may also be used in strongly absorbing environment. In addition, perspective Lab-on-Chip applications may benefit from the lack of requirement of high power Laser light. We have already demonstrated successful trapping of single commercially available magnetic beads using a combination of the field gradient produced by a micro structured ring conductor and a superimposed homogeneous magnetic field.

Here we present studies of two magnetic beads simultaneously trapped in the same ring structure which are coupled via magnetic dipole-dipole interaction. From the dynamics of the motion of the coupled beads in the trap potential, we extract information about the magnetic energy landscape formed by the combination of trap field and bead magnetization.

We use an approach based on probability distribution of particle position inside a potential energy landscape model. The model parameters extracted in this way are compared to results obtained by direct evaluation of the particle trajectories.