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Frozen-In Magnetic Order in Uniaxial Magnetic Gels: Preparation and Physical Properties

✍ Scribed by Dominique Collin; Günter K. Auernhammer; Odile Gavat; Philippe Martinoty; Helmut R. Brand

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
217 KB
Volume
24
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

We describe the preparation and characterization of uniaxial magnetic gels. Fibril formation of the embedded magnetic particles generates easily detectable magnetic and optical anisotropies. A finite magnetization is frozen‐in and leads to a ferromagnetic‐like response in small homogeneous external magnetic fields. We present, for the first time, frequency dependent measurements of the shear modulus G′. Despite their optical and magnetic anisotropy, the gels are mechanically isotropic.

The time‐dependent G′ for a ferrogel in the parallel orientation in a homogeneous field of 200 mT.

magnified imageThe time‐dependent G′ for a ferrogel in the parallel orientation in a homogeneous field of 200 mT.

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