Periodic structure of acicular magnetic clusters in a magnetic liquid |
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Authors: | O A Antonyuk V F Kovalenko B N Moldovan M V Petrichuk |
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Institution: | (1) Shevchenko National University, Vladimirskaya ul. 64, Kiev, 01033, Ukraine |
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Abstract: | The behavior of magnetic clusters in a magnetic liquid placed in a circular capillary is considered. When a uniform magnetic
field is applied to the system, acicular clusters grow from the sediment, being aligned with the field. The interaction of
the clusters as magnetic dipoles with one another and with an external gradient magnetic field is considered theoretically.
In a nonuniform symmetric magnetic field with a peak, the cluster distribution is uniform near the peak. Such a distribution
is fairly stable when the magnetic field gradient is varied over certain limits. The ordered (periodic) cluster configuration
is realized experimentally, and it is shown that its period can be controlled. As the magnetic field gradient exceeds a certain
threshold, the clusters are redistributed, forming a multirow hexagonal array. |
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Keywords: | |
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