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Issue 10, 2009
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Surface instabilities and magnetic soft matter

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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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The article was received on 11 Nov 2008, accepted on 05 Mar 2009 and first published on 16 Apr 2009

Article type: Paper
DOI: 10.1039/B820090D
Soft Matter, 2009,5, 2093-2100

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    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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