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Fréedericksz transition in a periodic magnetic field
Torrent, M. C. (Maria Carme); Sagués i Mestre, Francesc; Arias, F.; San Miguel Ruibal, Maximino
Universitat de Barcelona
We study the Fréedericksz transition in a twist geometry under the effect of a periodic modulation of the magnitude of the applied magnetic field. We find a shift of the effective instability point and a time-periodic state with anomalously large orientational fluctuations. This time-periodic state occurs below threshold and it is accompanied by a dynamically stabilized spatial pattern. Beyond the instability the emergence of a transient pattern can be significantly delayed by a fast modulation, allowing the observation of pattern selection by slowing down the reorientational dynamics.
Cristalls líquids
Transformacions de fase
Liquid crystals
Phase transformations (Statistical physics)
(c) The American Physical Society, 1988
The American Physical Society

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