Super-lattice, rhombus, square, and hexagonal standing waves in magnetically driven ferrofluid surface

Details Super-lattice, rhombus, square, and hexagonal standing waves in magnetically driven ferrofluid surface Super-lattice, rhombus, square, and hexagonal standing waves in magnetically driven ferrofluid surface

2000-05-13

arxiv.org/abs/cond-mat/0005224v1

Phys. Rev. Lett. v.84, 5316 (2000)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevLett.84.5316

Standing wave patterns that arise on the surface of ferrofluids by (single frequency) parametric forcing with an ac magnetic field are investigated experimentally. Depending on the frequency and amplitude of the forcing, the system exhibits various patterns including a superlattice and subharmonic rhombuses as well as conventional harmonic hexagons and subharmonic squares. The superlattice arises in a bicritical situation where harmonic and subharmonic modes collide. The rhombic pattern arises due to the non-monotonic dispersion relation of a ferrofluid.

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