Surface Instabilities and Magnetic Soft Matter
Soft Condensed Matter
2009-03-06 v2
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 beta=1/3. The resulting magnetic threshold for the formation of Rosensweig-cusps is measured for different temperatures, and compared with theoretical predictions by Bohlius et. al. in J. Phys.: Condens. Matter., 2006, 18, 2671-2684.
Cite
@article{arxiv.0811.1526,
title = {Surface Instabilities and Magnetic Soft Matter},
author = {Christian Gollwitzer and Marina Krekhova and Guenter Lattermann and Ingo Rehberg and Reinhard Richter},
journal= {arXiv preprint arXiv:0811.1526},
year = {2009}
}
Comments
accepted to Soft Matter