Magnetic Properties of Magnetite Formed by Biomineralization and Chemical Synthesis

• Authors: M. Timko , A. Džarová , P. Kopčanský , V. Závišová , M. Koneracká , J. Kováč , A. Šprincová , M. Vaclavíková , L. Ivaničová , I. Vávra
• Languages of publication: EN

Abstracts

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.

Keywords

EN

75.75.+a; 47.65.Cb; 87.83.+a

Discipline

• 47.65.Cb: Magnetic fluids and ferrofluids

• Journal: Acta Physica Polonica A
• Year: 2008
• Volume: 113
• Issue: 1
• Pages: 573-576

Dates

published

2008-01

received

2007-07-09

Contributors

author

M. Timko

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

A. Džarová

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

P. Kopčanský

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

V. Závišová

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

M. Koneracká

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

J. Kováč

• Institute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia

author

A. Šprincová

• Laboratory of Radiation Biology, JINR, Dubna, Russia

author

M. Vaclavíková

• Institute of Geotechnics, SAS, Watsonova 45, 040 01 Košice, Slovakia

author

L. Ivaničová

• Institute of Geotechnics, SAS, Watsonova 45, 040 01 Košice, Slovakia

author

I. Vávra

• Institute of Electrical Engineering, SAS, Dúbravská 9, 841 04 Bratislava, Slovakia

References

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Identifiers

DOI

10.12693/APhysPolA.113.573