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Issue 10, 2009
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Surface instabilities and magnetic soft matter

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Abstract

We report on the formation of surface instabilities in a layer of thermoreversible ferrogel when exposed to a vertical magnetic field. Both static and time dependent magnetic fields are employed. Under variations of temperature, the viscoelastic properties of our soft magnetic matter can be tuned. Stress relaxation experiments unveil a stretched exponential scaling of the shear modulus, with an exponent of β = 1/3. The resulting magnetic threshold for the formation of Rosensweig-cusps is measured for different temperatures, and compared with theoretical predictions by S. Bohlius, H. Pleiner and H. R. Brand, J. Phys.: Condens. Matter., 2006, 18, S2671–S2684.

Graphical abstract: Surface instabilities and magnetic soft matter

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Submitted
11 Nov 2008
Accepted
05 Mar 2009
First published
16 Apr 2009

Soft Matter, 2009,5, 2093-2100
Article type
Paper

Surface instabilities and magnetic soft matter

C. Gollwitzer, M. Krekhova, G. Lattermann, I. Rehberg and R. Richter, Soft Matter, 2009, 5, 2093
DOI: 10.1039/B820090D

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