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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.
04-05-2010
Cristalls líquids
Transformacions de fase
Liquid crystals
Phase transformations (Statistical physics)
(c) The American Physical Society, 1988
Artículo
The American Physical Society
         

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