Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 431, Issue -, Pages 79-83Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2016.07.053
Keywords
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Funding
- German Science Foundation( DFG) [SPP 1681, STA 425/36, BE 2243/2]
- COST Action [IC1208]
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We introduce a binary colloidal system with an exceptionally strong magneto-optical response. Its induced optical birefringence at even low magnetic fields (in the mT range) reaches a value with the same order of magnitude as that of nematic liquid crystals. This system is based on a binary mixture of plate-like, non-magnetic pigment nanoparticles and a small volume fraction ( <1v% ) of spherical magnetic nanoparticles. In the field-free state, the suspension is isotropic. Birefringence is caused by an alignment of the pigment platelets, commanded by shape-anisotropic agglomerates of the magnetic nanoparticles in an external magnetic field. We give a semiquantitative discussion about this.
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