Response of a ferrofluid to traveling-stripe forcing

Details Response of a ferrofluid to traveling-stripe forcing Response of a ferrofluid to traveling-stripe forcing

2008-03-20

arxiv.org/abs/0803.3038v1

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1088/0953-8984/20/20/204109

We observe the dynamics of waves propagating on the surface of a ferrofluid under the influence of a spatially and temporarily modulated field. In particular, we excite plane waves by a travelling lamellar modulation of the magnetization. By this external driving both the wavelength and the propagation velocity of the waves can be controlled. The amplitude of the excited waves exhibits a resonance phenomenon similar to that of a forced harmonic oscillator. Its analysis reveals the dispersion relation of the free surface waves, from which the critical magnetic field for the onset of the Rosensweig instability can be extrapolated.

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