Light scattering by aggregates of magnetite nanoparticles in a magnetic field

Erin, K. V.; Kunikin, S. A.

doi:10.1134/s1063784207100131

Cited by 3 publications

(1 citation statement)

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“…The planar weak magnetic field (∼ 10 Oe) induces the anisotropic growth of the aggregates for ∼ 60 s, which changes the FF optical transmission. It was shown that short planar magnetic field pulses (∼ 5 s) applied to thick FF layers (∼ 10 mm) with aggregates induces a sharp increase in the scattered light intensity right after the pulse rising edge [24]. This value did not change over the pulse duration and returned back to the initial magnitude after the pulse falling edge.…”

Section: Introductionmentioning

confidence: 96%

Magneto-optical extinction trend inversion in ferrofluids

Shulyma

Tanygin

Kovalenko

et al. 2016

Journal of Magnetism and Magnetic Materials

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Effects of pulse magnetic field on the optical transmission properties of thin ferrofluid (FF) layers were experimentally investigated. It was observed that, under an influence of an external uniform magnetic field, pulses applied to the samples surfaces in normal direction decrease the optical transmission with further returning it to its original state, even before the end of the field pulse. The dependencies of the observed effects on the magnetic pulse magnitude and the samples thickness were investigated. The experimental results are explained using FF columnar aggregates growth and lateral coalescence under influence of a magnetic field, leading to a light scattering type Rayleigh-to-Mie transition. Further evolution of this process comes to a geometrical optics scale and respective macroscopic observable opaque FF columnar aggregates emergence. These changes of optical transmission are non-monotonic during the magnetic field pulse duration with minimal value in the case of Mie scattering, which is known as a magneto-optical extinction trend inversion. The residual inversion was detected after the external magnetic field pulse falling edge. Using molecular dynamics simulation, we showed that a homogeneous external magnetic field is enough for the formation of columnar aggregates and their fusion. The results clarify the known Li theory (Li et al., J. Phys. D: Appl. Phys. 37 (2004) 3357, and Sci. Technol. Adv. Mate. 8 (2007) 448), implying an inhomogeneous field as a required prerequisite for the magneto-optical extinction trend inversion phenomenon

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Section: Introductionmentioning

confidence: 96%

Magneto-optical extinction trend inversion in ferrofluids

Shulyma

Tanygin

Kovalenko

et al. 2016

Journal of Magnetism and Magnetic Materials

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Light diffraction in rotating magnetic emulsions in a magnetic field

Yerin

Belykh

2022

AIP Advances

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The light diffraction in magnetic emulsions with droplets of a kerosene based magnetic fluid in AMG-10 hydraulic oil under the influence of magnetic and hydrodynamic fields has been studied experimentally. Rotation of the emulsion sample in a uniform magnetic field revealed a deflection of the diffraction pattern by a certain angle. An interpretation of the effect based on the anomalous diffraction approximation is proposed. The rotation of the diffraction pattern in the field of hydrodynamic forces is interpreted based on the balance of the torques of magnetic and viscous friction forces acting on an elongated droplet of magnetic fluid.

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