Berlin 2015 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 44: Pattern Formation

DY 44.7: Vortrag

Donnerstag, 19. März 2015, 11:15–11:30, BH-N 333

On the self-assembly of magnetic cubes - infinite frustration bears a sevenfold magnetic clutch — •Ingo Rehberg — Experimentalphysik V, Uni Bayreuth

The self-assembly of magnetic particles into a simple cubic lattice [1] triggers questions like: - Why do they form cuboids,rather than chains or ribbons? - What is the overall magnetization of those clusters? - How susceptible are they to external magnetic fields? - What is the arrangement of the individual magnets within those clusters?

Answers are provided by experimental investigations [1] and calculations based on dipole-dipole interaction of magnetic particles [2]. The minimal arrangement consisting of eight dipoles arranged in the corners of a cube bears a continuum of dipoles arrangements as the ground state, suggesting a seven-fold magnetic clutch operating smoothly in the flat potential valley of this goldstone mode.

[1] S. Mehdizadeh Taheri, S. Rosenfeldt, M. Michaelis, M. Drechsler, B. Förster, P. Böseke, T. Friedrich, I. Rehberg, and S. Förster, in preparation.

[2] J. Schönke, T. Schneider, and I. Rehberg, in preparation.