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Orientational transitions in ferromagnetic liquid crystals with bistable coupling between colloidal particles and the matrix

  • Statistical, Nonlinear, and Soft Matter Physics
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Abstract

We study the orientational response of a ferromagnetic liquid crystal that is induced by magnetic and electric fields. A modified form of the energy of the orientational interaction between magnetic impurity particles and the liquid crystal matrix that leads to bistable coupling is considered. It is shown that apart from magnetic impurity segregation, first-order orientational transitions can be due to the bistability of the potential of the orientational coupling between the director and the magnetization. The ranges of material parameters that lead to optical bistability are determined. The possibility of first-order orientational transitions is analyzed for the optical phase difference between the ordinary and extraordinary light rays transmitted through a ferronematic cell. It is shown that an electric field applied in the given geometry considerably enhances the magneto-orientational response of the ferronematic.

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Authors and Affiliations

  1. Perm State National Research University, Perm, 614990, Russia

    A. N. Zakhlevnykh & D. A. Petrov

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  1. A. N. Zakhlevnykh
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  2. D. A. Petrov
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Correspondence to A. N. Zakhlevnykh.

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Original Russian Text © A.N. Zakhlevnykh, D.A. Petrov, 2016, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2016, Vol. 123, No. 4, pp. 793–806.

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Zakhlevnykh, A.N., Petrov, D.A. Orientational transitions in ferromagnetic liquid crystals with bistable coupling between colloidal particles and the matrix. J. Exp. Theor. Phys. 123, 687–698 (2016). https://doi.org/10.1134/S1063776116090168

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  • DOI: https://doi.org/10.1134/S1063776116090168

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