Relaxation of the magnetic field-induced birefringence in ferrosmectics

Spoliansky, D.; Ferré, J.; Jamet, J. P.; Ponsinet, Virginie

doi:10.1016/s0304-8853(99)00045-1

Cited by 5 publications

(10 citation statements)

References 6 publications

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“…The study of the relaxation of birefringence in ferrosmectics has been reported in reference [7]. We present these results, as well as experiments performed on ferrohexagonals which enable us to interpret the confinement properties presented earlier.…”

Section: Study Of the Dynamics Of The Lbmentioning

confidence: 77%

“…One checks that the frequency of this oscillating signal is twice that of the rotating field: this is consistent with the fact that the particle component ∆n(H) of the LB is an even function of the applied field. Moreover, no phase mismatch is detected between the field and the output signal since the orientation of the particles is much faster than the field variation [7]; • the slowly increasing part of the curve (Fig. 4) is related to the progressive alignment of the smectic layers towards the plane of rotation of the field, up to reach the maximum value, ∆n lam = 1.7×10 −4 , of the optical anisotropy of the layered structure [11].…”

Section: Rotating Magnetic Fieldmentioning

confidence: 99%

“…In this section, the equilibrium state is always reached since the experimental characteristic times are much longer than the particle orientation relaxation times [7].…”

Section: Static Measurementsmentioning

confidence: 99%

“…We also present and discuss dynamic aspects, from relaxation LB experiments [7]. The study of the orientation of magnets in an external field was shown to be a way of probing the elastic properties of the surrounding medium [8].…”

Section: Introductionmentioning

confidence: 99%

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Magneto-optical study of the orientation confinement of particles in ferrolyotropic systems

et al. 2000

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Ferrosmectics and ferrohexagonals are magnetic liquid crystals which consist of a lamellar and a hexagonal phase in which magnetic nanoparticles are incorporated. The magnetic field variation and the relaxation of the linear optical birefringence of ferrosmectics and ferrohexagonals and its time relaxation are measured in different geometries and compared with that of a ferrofluid sample. We interpret our data by the existence of a mean orientation of the magnetic particles in the lyotropic structure, which appears to be non-random in zero field. We conclude that the magnetic moments of the particles are preferentially aligned in the plane of the ferrosmectic layers and along the axis of the ferrohexagonal cylinders, respectively. To account for this preferred alignment, we propose that some of the particles in the ferrosmectic are adsorbed on the surfactant layers with their moment aligned in the lamellar plane, while the orientation of the moments in the ferrohexagonal is restricted to a cone around the cylinder axis.PACS. 75.50.Mm Magnetic liquids -78.20.Ls Magnetooptical effects -61.30.Gd Orientational order of liquid crystals; electric and magnetic field effects on order

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Section: Study Of the Dynamics Of The Lbmentioning

confidence: 77%

Section: Rotating Magnetic Fieldmentioning

confidence: 99%

“…In this section, the equilibrium state is always reached since the experimental characteristic times are much longer than the particle orientation relaxation times [7].…”

Section: Static Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magneto-optical study of the orientation confinement of particles in ferrolyotropic systems

et al. 2000

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“…A number of experimental studies [12][13][14][15][16][17][18][19][20] are devoted to study of ferrosmectic phase in both in thermotropic and lyotropic liquid crystals. The most essential feature of the ferrosmectics is that their structure aligns parallel to an external magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Effect of magnetic nanoparticles on the nematic-smectic-A phase transition

Mukherjee

Chattopadhyay

2017

Journal of Molecular Liquids

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Reversal of Circular Bragg Phenomenon in Ferrocholesteric Materials with Negative Real Permittivities and Permeabilities

Lakhtakia¹

2002

Adv. Mater.

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A reversal of the Bragg phenomenon is shown to exist theoretically in a right/left‐handed ferrocholesteric slab with negative real permittivities and permeabilities. In addition to the promise of isotropic homogeneous materials with negative real permittivities and permeabilities for unexpected applications (e.g., distortion‐free lenses), the presented results underscore the similar potential of anisotropic inhomogeneous materials with analogous characteristics.

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Relaxation of the magnetic field-induced birefringence in ferrosmectics

Cited by 5 publications

References 6 publications

Magneto-optical study of the orientation confinement of particles in ferrolyotropic systems

Magneto-optical study of the orientation confinement of particles in ferrolyotropic systems

Effect of magnetic nanoparticles on the nematic-smectic-A phase transition

Reversal of Circular Bragg Phenomenon in Ferrocholesteric Materials with Negative Real Permittivities and Permeabilities

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