Longitudinal magneto-optical study of Brown relaxation in ferrofluids:

Payet, B; Donatini, Fabrice; Noyel, G.

doi:10.1016/s0304-8853(99)00056-6

Cited by 17 publications

(6 citation statements)

References 1 publication

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“…Since the Faraday effect is produced by the orientation of the magnetic moments, it should follow the same relaxation law as the magnetization. This relaxation of the Faraday rotation as a function of the frequency of the magnetic field was indeed observed [27]. The characteristic relaxation time can be obtained either from the study of the frequency dependence of the Faraday rotation or from the study of the transient response as the magnetic field is turned off.…”

Section: Dynamical Aspects Of the Phementioning

confidence: 60%

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Photonic Hall effect in ferrofluids: Theory and experiments

et al. 2000

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An experimental and theoretical study on the photonic Hall effect (PHE) in liquid and gelled samples of ferrofluids is presented. The ferrofluids are aqueous colloidal suspensions of Fe2CoO4 particles, which can be considered as anisotropic and absorbing Rayleigh scatterers. The PHE is found to be produced by the orientation of the magnetic moments of the particles, as is also the case for the Faraday effect. The dependence of the PHE with respect to the concentration of the scatterers, the magnetic field, and the polarization of the incident light is measured in liquid and in gelled samples, and is compared to a simple model based on the use of a scattering matrix and the single scattering approximation.

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Section: Dynamical Aspects Of the Phementioning

confidence: 60%

“…The proportionality of the magnetic susceptibility (23) and the Faraday rotation (measured both in amplitude and phase) has been established in Ref. [27]. Therefore, it is expected that the PHE should be also proportional to this complex magnetic susceptibility.…”

Section: Dynamical Aspects Of the Phementioning

confidence: 85%

Photonic Hall effect in ferrofluids: Theory and experiments

et al. 2000

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“…The imaginary part of the first harmonic versus frequency for CoFe 2 O 4 samples presents a relaxation peak linked to the carrier liquid viscosity [23], contrarily to g-Fe 2 O 3 samples. The real part of this latter is constant before the relaxation frequency, then decreases to zero.…”

Section: Longitudinal Magneto-optic Effects (Lmoe)mentioning

confidence: 99%

“…The magneto-optical properties of magnetic fluids [4][5][6][7][8][9][10][11][12] are widely studied since a long time, the ferrofluid particles being dispersed either in liquid matrix or in a frozen one [26][27][28][29]. They are interesting from both a static point of view and from a dynamical one [6,12,20,23]. For their part, the dynamical properties bring up important technological issues, such as viscometers, nanosizers or optical modulators [4,[30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the magneto-optic effects of ferrofluids via dynamic measurements

Jamon

Donatini

Siblini

et al. 2009

Journal of Magnetism and Magnetic Materials

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“…The formation of dc field-induced structures in field-controllable fluids and their effect on the properties of the suspension have been studied theoretically 14--19 and experimentally through Raman scattering, 20 birefringence and scattering dichroism measurements, 10,11,21 Faraday rotation and Faraday ellipticity, 22,23 visible light and/or x-ray scattering, 7,11,12,24,25 and optical attenuation or transmission measurements. 4,9,26 The current model for pattern *crablau@kettering.edu; phone 1 810 762-7867 formation in ferrofluids consists of a two-stage process: chain formation and column formation.…”

Section: Introductionmentioning

confidence: 99%

Nanoparticle aggregation and relaxation effects in ferrofluids: studied through anisotropic light scattering

et al. 2008

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We have investigated the aggregation and dissociation dynamics of 6-nm size Fe 3 O 4 nanoparticles coated by tetra methyl ammonium hydroxide (TMAH) and the same size γ-Fe 2 O 3 nanoparticles precipitated inside an alginate hydrogel matrix, both in aqueous suspensions, using dc magnetic-field-induced time-dependent light scattering patterns. For the Fe 3 O 4 ferrofluid, a strong anisotropy in light scattering was observed for light propagating perpendicular to the magnetic field. This behavior is attributed to the aggregation of the nanoparticles into chain-like and column-like structures oriented parallel to the magnetic field. A significantly different behavior is observed for the aqueous suspension of γ-Fe 2 O 3 nanoparticles precipitated in alginate hydrogel, for which the application of the dc magnetic field produced little to no change in the light scattering patterns. We attribute this difference to the constrained random distribution of γ-Fe 2 O 3 nanoparticles precipitated in the alginate matrix. Correlating the results from this investigation with our previous study of magneto-thermal measurements in ac fields [Vaishnava et al., J. Appl. Phys. 102, 063914 (2007)], we conclude that for a ferrofluid to exhibit significant thermal effects under an ac magnetic field, it should exhibit optical anisotropy by developing a chain like structure under the influence of a dc magnetic field.

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Longitudinal magneto-optical study of Brown relaxation in ferrofluids:

Cited by 17 publications

References 1 publication

Photonic Hall effect in ferrofluids: Theory and experiments

Photonic Hall effect in ferrofluids: Theory and experiments

Experimental investigation on the magneto-optic effects of ferrofluids via dynamic measurements

Nanoparticle aggregation and relaxation effects in ferrofluids: studied through anisotropic light scattering

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