Effect of positional disorder in systems of ultrafine ferromagnetic particles |
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Authors: | M Porto |
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Institution: | 1.Max-Planck-Institut für Physik komplexer Systeme, N?thnitzer Strasse 38, 01187 Dresden, Germany,DE |
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Abstract: | A simple model for systems of dipolarly interacting single-domain ultrafine ferromagnetic particles is studied by Monte Carlo
simulations of zero field cooling and field cooling as well as relaxation experiments. By investigating systems characterized
by an identical moderate concentration but different types of particle positions' disorder, it is shown that the positional
disorder has a crucial influence on the magnetic behavior of the system. For extreme values of positional disorder, the interplay
between spatial disorder and dipolar interaction can even lead to a cooperative freezing at low temperatures.
Received 28 November 2001 |
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Keywords: | PACS 75 50 Tt Fine-particle systems nanocrystalline materials – 75 40 Mg Numerical simulation studies – 75 50 Lk Spin glasses and other random magnets |
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