Ferrofluids as thermal ratchets

Details Ferrofluids as thermal ratchets Ferrofluids as thermal ratchets

2002-09-05

arxiv.org/abs/cond-mat/0209137v2

Physics

Condensed Matter

Materials Science

4 pages, 3 figures, corrected version, improved figures, to be published in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.91.060602

Colloidal suspensions of ferromagnetic nano-particles, so-called ferrofluids, are shown to be suitable systems to demonstrate and investigate thermal ratchet behavior: By rectifying thermal fluctuations, angular momentum is transferred to a resting ferrofluid from an oscillating magnetic field without net rotating component. Via viscous coupling the noise driven rotation of the microscopic ferromagnetic grains is transmitted to the carrier liquid to yield a macroscopic torque. For a simple setup we analyze the rotation of the ferrofluid theoretically and show that the results are compatible with the outcome of a simple demonstration experiment.

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