Magnetization of rotating ferrofluids: the effect of polydispersity

Details Magnetization of rotating ferrofluids: the effect of polydispersity Magnetization of rotating ferrofluids: the effect of polydispersity

2006-08-03

arxiv.org/abs/physics/0608033v1

Physics

Fluid Dynamics

11 pages, 7 figures, to be published in Journal of Physics C

Scientific paper

10.1088/0953-8984/18/38/S07

The influence of polydispersity on the magnetization is analyzed in a nonequilibrium situation where a cylindrical ferrofluid column is enforced to rotate with constant frequency like a rigid body in a homogeneous magnetic field that is applied perpendicular to the cylinder axis. Then, the magnetization and the internal magnetic field are not longer parallel to each other and their directions differ from that of the applied magnetic field. Experimental results on the transverse magnetization component perpendicular to the applied field are compared and analyzed as functions of rotation frequency and field strength with different polydisperse Debye models that take into account the polydispersity in different ways and to a varying degree.

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