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          Institute: MPI für Polymerforschung     Collection: MPI Polymerforschung     Display Documents



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ID: 56355.0, MPI für Polymerforschung / MPI Polymerforschung
Ferrofluids as thermal ratchets
Authors:Engel, A.; Müller, H. W.; Reimann, P.; Jung, A.
Language:English
Date of Publication (YYYY-MM-DD):2003-08-08
Title of Journal:Physical Review Letters
Journal Abbrev.:Phys. Rev. Lett.
Volume:91
Issue / Number:6
Sequence Number of Article:060602
Review Status:not specified
Audience:Not Specified
Abstract / Description:Colloidal suspensions of ferromagnetic nanoparticles, 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.
Comment of the Author/Creator:Date: 2003, AUG 8
External Publication Status:published
Document Type:Article
Affiliations:MPI für Polymerforschung
External Affiliations:Univ Magdeburg, Inst Theoret Phys, D-39106 Magdeburg, Germany.; Univ Bielefeld, Fak Phys, D-33501 Bielefeld, Germany.; Univ Saarland, D-66041 Saarbrücken, Germany.
Identifiers:ISI:000184678200004 [ID No:1]
ISSN:0031-9007 [ID No:2]
LOCALID:P-03-225
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