Regensburg 2007 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 9: POSTER: Colloids and Nanoparticles

CPP 9.9: Poster

Monday, March 26, 2007, 16:00–18:00, Poster B

Interaction of magnetic colloids in periodic potentials — Larysa Baraban, •Artur Erbe, and Paul Leiderer — Universität Konstanz, FB Physik, Germany

Magnetic colloids are widely used as model systems for a variety of processes in statistical physics. In this work we study the behavior of micron-sized particles exhibiting a permanent magnetic moment. This moment is generated by a magnetic cap, which enables us to observe the direction of the magnetic moment with standard video microscopy. Thus interactions in large particle arrays can be observed. We demonstrate the creation of such arrays in square and triangular symmetry and investigate the particle-particle interactions as well as the interactions with the substrate. The magnetic moments of the particles are characterized using SQUID, MFM, and magnetooptic techniques.