3D Monte Carlo simulations of a magnetic disk-like particle dispersion |
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Authors: | Akira Satoh Masayuki Aoshima |
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Institution: | (1) Faculty of Systems Science and Technology, Akita Prefectural University, 84-4, Ebinokuchi, Tsuchiya-aza, Yuri-honjo 015-0055, Japan |
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Abstract: | We have investigated the aggregate structures of a colloidal dispersion composed of ferromagnetic disk-like particles with
a magnetic moment normal to the particle axis at the particle center, by means of 3D Monte Carlo simulations. Such disk-like
particles have been modeled as a circular disk-like particle with the side section shape of spherocylinder. We have attempted
to clarify the influences of the magnetic field strength, magnetic interactions between particles and volumetric fraction
of particles. In order to discuss quantitatively the aggregate structures of clusters, we have focused on the radial distribution
and orientational pair correlation functions, etc. For no applied magnetic field cases, long column-like clusters come to
be formed with increasing magnetic particle–particle interactions. The internal structures of these clusters clearly show
that the particles incline in a certain direction and their magnetic moments alternate in direction between the neighboring
particles in the clusters. For applied magnetic field cases, the magnetic moment of each particle inclines in the magnetic
field direction and therefore the column-like clusters are not formed straightforwardly. If the magnetic field is much stronger
than magnetic particle–particle interactions, the particles do not have a tendency to form the clusters. As the influence
of magnetic particle–particle interactions is significantly strong, thick chain-like clusters or column-like clusters or brick-wall-like
clusters come to be formed along the magnetic field direction. |
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