The mechanism of thermomagnetic convection in ferrofluids which is introduced by a magnetic field is well understood. To describe this kind of convection, it is assumed that the material properties, e.g. the viscosity η are independent from the magnetic field. However under certain circumstances ferrofluids show a magnetoviscous effect that means the increase ofηin the presence of a magnetic field. Both effects have been well investigated but independently from each other. In this paper it is experimentally shown how the magnetoviscous effect and therefore the increase ofη influence the behaviour of the thermomagnetic convection.
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