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Journal Article

Temperature dependence of the critical magnetic field of the structural transition in MBBA-based ferronematics

MPS-Authors

Koneracká,  M.
Max Planck Society;

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Citation

Tomašovičova, N., Koneracká, M., Kopčansky, P., Timko, M., Závišova, V., & Jadzyn, J. (2006). Temperature dependence of the critical magnetic field of the structural transition in MBBA-based ferronematics. Phase Transitions, 79(6-7), 595-603.


Cite as: https://hdl.handle.net/21.11116/0000-000E-B4C1-C
Abstract
We studied the structural transitions in ferronematics based on the thermotropic nematic liquid crystal MBBA (4'-methoxybenzylidene-4-n-butylaniline) having a nematic-to-isotropic transition temperature TN-I = 48.0 degrees C and in MBBA-based ferronematics doped with a magnetic suspension consisting of Fe3O4 particles (10 nm in diameter) coated with oleic acid as a surfactant. The ferronematic samples were prepared with different volume concentrations of magnetic particles phi = 1 x 10(-4), 2 x 10(-4) and 5 x 10(-4). The temperature dependences of the critical magnetic fields in a bias electric field under strong applied magnetic fields are presented. We calculated the surface density of anchoring energy W at the nematic - magnetic particle boundary. Scaling of the structural transition in the MBBA and MBBA-based ferronematics with the temperature of the nematic-to-isotropic transition was observed.