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Frozen‐In Magnetic Order in Uniaxial Magnetic Gels: Preparation and Physical Properties
Author(s) -
Collin Dominique,
Auernhammer Günter K.,
Gavat Odile,
Martinoty Philippe,
Brand Helmut R.
Publication year - 2003
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200350016
Subject(s) - anisotropy , isotropy , materials science , magnetic field , homogeneous , shear modulus , ferromagnetism , magnetic anisotropy , magnetic nanoparticles , magnetization , characterization (materials science) , condensed matter physics , elastic modulus , orientation (vector space) , magnetostatics , nuclear magnetic resonance , composite material , optics , nanotechnology , physics , nanoparticle , thermodynamics , geometry , quantum mechanics , mathematics
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.