Phys. Rev. Lett. 84, 5316–5319 (2000)

Superlattice, Rhombus, Square, and Hexagonal Standing Waves in Magnetically Driven Ferrofluid Surface

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Hyun-Jae Pi, So-yeon Park, Jysoo Lee, and Kyoung J. Lee^*
National Creative Research Initiative Center for Neuro-dynamics and Department of Physics, Korea University, Seoul 136-701, Korea

Received 7 December 1999; published in the issue dated 5 June 2000

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 nonmonotonic dispersion relation of a ferrofluid.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.84.5316

DOI:

10.1103/PhysRevLett.84.5316

PACS:

47.20.-k, 47.54.+r, 75.50.Mm

^*To whom correspondence should be addressed.Email address: kyoung@nld.korea.ac.kr

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Phys. Rev. Lett. 84, 5316–5319 (2000)

Superlattice, Rhombus, Square, and Hexagonal Standing Waves in Magnetically Driven Ferrofluid Surface

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