Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)
MA 63.67: Poster
Freitag, 18. März 2011, 11:00–14:00, P2
Using symmetry breaking for the directed transport of paramagnetic colloids on garnet films — •Saeedeh Aliaskarisohi1, Tom.H Johansen2, and Thomas.M Fischer1 — 1Institut für Experimentalphysik, Universität Bayreuth, 95440 Bayreuth, Germany — 2Department of Physics, University of Oslo, P.O.Box 1048, Blindern, 0316 Oslo, Norway
The transport behavior of paramagnetic particles on top of a ferrimagnetic garnet film is investigated in a modulated external magnetic field. Broken symmetries are required to direct the transport of the particles. We provide such symmetry breaking by tilting the external field modulation with respect to the garnet film normal and by the intrinsic geometrical symmetry breaking of the garnet film magnetic pattern. The interplay of both symmetry breaking mechanisms cause a rich variety in transport behavior and direction. We corroborate our experimetal transport directions by comparing experimental with theoretical transport phase diagrams. Directing the transport of paramagnetic colloids will be useful when they are loaded with biomedical cargo on a magnetic lab-on-a-chip device.