Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5490358 | Journal of Magnetism and Magnetic Materials | 2017 | 5 Pages |
Abstract
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.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Kathrin May, Alexey Eremin, Ralf Stannarius, Balázs Szabó, Tamás Börzsönyi, Ingo Appel, Silke Behrens, Susanne Klein,