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Exceptionally large magneto-optical response in dispersions of plate-like nanocrystallites and magnetic nanoparticles

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...

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Main Authors: May, Kathrin (Author) , Eremin, Alexey (Author) , Stannarius, Ralf (Author) , Szabó, Balázs (Author) , Börzsönyi, Tamás (Author) , Appel, Ingo (Author) , Behrens, Silke (Author) , Klein, Susanne (Author)
Format: Article (Journal)
Language:English
Published: 1 June 2017
In: Journal of magnetism and magnetic materials
Year: 2016, Volume: 431, Pages: 79-83
ISSN:1873-4766
DOI:10.1016/j.jmmm.2016.07.053
Online Access:Verlag, Volltext: http://dx.doi.org/10.1016/j.jmmm.2016.07.053
Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S0304885316315670
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Author Notes:Kathrin May, Alexey Eremin, Ralf Stannarius, Balázs Szabó, Tamás Börzsönyi, Ingo Appel, Silke Behrens, Susanne Klein

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520 |a 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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