FREEDERICKSZ TRANSITION OF A HOMEOTROPIC NEMATIC LIQUID CRYSTAL IN ROTATING MAGNETIC FIELDS

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Abstract
We present experimental and theoretical investigations on the Freedericksz transition of a homeotropic nematic slab in rotating magnetic field. Two characteristic fields, and one critical frequency are necessary to describe the behaviour of the sample : — Ha(ω) separates synchronous and asynchronous rotations of the director. — Hc(ω) is the threshold for the distortion. Ha(ω) = Hc(ω) for ω = ω1. For ω < ω1, Ha(ω) < Hc(ω), and only a synchronous regime is observed. For ω > ω1, Ha(ω) > Hc(ω) and both synchronous and asynchronous regime appear

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