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Investigation of the Magnetic Properties of Nanocrystalline Fe3O4 Precipitated on the Surface of Chitin

✍ Scribed by Amulevicius, A. ;Baltrunas, D. ;Bendikiene, V. ;Daugvila, A. ;Davidonis, R. ;Mazeika, K.

Publisher: John Wiley and Sons
Year: 2002
Tongue: English
Weight: 157 KB
Volume: 189
Category: Article
ISSN: 0031-8965
DOI: 10.1002/1521-396x(200201)189:1<243::aid-pssa243>3.0.co;2-y

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✦ Synopsis

Magnetic properties of nanocrystalline spherical Fe 3 O 4 particles deposited on a chitin surface were investigated, and the mechanisms of precipitation and magnetization were explained. The main investigations were performed by means of Mo ¨ssbauer spectroscopy and by measurements of the saturation magnetization. The size of chitin particles used as magnetic carriers was 0.05-0.25 mm, and the Fe 3 O 4 particles were precipitated from a ferrofluid. The experimental results agreed well with the theoretical model of the superferromagnetic state. The remaining magnetic properties in nanometric Fe 3 O 4 particles were explained by collective magnetic interactions. It has been found that the saturation magnetization of magnetic carriers --nanocrystalline Fe 3 O 4 particles deposited on a chitin surface --is two or three times lower than that of bulk Fe 3 O 4 crystals of the same amount.

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