Texturing of the magnetic nanoparticle easy axes during freezing of a magnetic suspension under the presence of an external field

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Resumo

Solidification of a magnetic suspension under the presence of a magnetic field results in obtaining a ferrocomposite characterized by an orientational texture of the easy magnetization axes of nanoparticles. The characteristics of this texture are calculated under the condition when the interparticle magnetic dipole interaction is taken into account in the framework of the modified mean field theory. Theoretical predictions are confirmed by computer Monte Carlo simulation data.

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Sobre autores

A. Ivanov

Ural Federal University

Autor responsável pela correspondência
Email: Alexey.Ivanov@urfu.ru
Rússia, Ekaterinburg

A. Solovyova

Ural Federal University

Email: Alexey.Ivanov@urfu.ru
Rússia, Ekaterinburg

I. Subbotin

Ural Federal University

Email: Alexey.Ivanov@urfu.ru
Rússia, Ekaterinburg

E. Elfimova

Ural Federal University

Email: Alexey.Ivanov@urfu.ru
Rússia, Ekaterinburg

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2. Fig. 1. Distribution density fp of easy axes of magnetization by angle ξi for a textured ferrocomposite with a volume fraction of particles φ = 0.125 and a parameter σp = 15 for different values ​​of the polymerization field αp = 1 (black circles), 2.5 (green triangles), 5 (red squares), 10 (blue triangles): (a) χL = 1, λp = 1; (b) χL = 2, λp = 2. The symbols indicate the results of computer Monte Carlo simulation, the dashed curves correspond to the case of non-interacting particles, and the solid curves show the predictions of the present theory (9).

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3. Fig. 2. The second moment Q2 of the orientation distribution depending on the anisotropy parameter σp for a textured ferrocomposite with a particle volume fraction φ = 0.125 and for different values ​​of the polymerization field αp = 1 (black circles), 2.5 (green triangles), 5 (red squares), 10 (blue triangles): (a) χL = 1, λp = 1; (b) χL = 2, λp = 2. The symbols indicate the results of computer Monte Carlo simulation, the dashed curves correspond to the case of non-interacting particles, and the solid curves show the predictions of the present theory (11).

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