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Magnetic Properties of Magnetite Formed by Biomineralization and Chemical Synthesis

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Timko M., Džarová A., Kopčanský P., Závišová V., Koneracká M., Kováč J., Šprincová A., Vaclavíková M., Ivaničová L., Vávra I.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
573-576
EN
In this work, the magnetic properties of biologically produced magnetite (magnetosomes) by biomineralization process were compared to those of chemically synthesized Fe_3O_4. The coercivity of 185 Oe in magnetosomes is connected with the fact that the mean diameter is larger than critical size for transition from superparamagnetic to ferromagnetic behavior. A sharp magnetic transition at 105 K (Verwey transition) is clearly present in magnetosomes while in opposite, this transition is missing in Fe_3O_4.
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