Eur. Phys. J. AP
Volume 9, Number 2, February 2000
|Page(s)||125 - 130|
|Published online||15 February 2000|
Structural and magnetic properties of iron oxides in co-sputtered granular thin films
Laboratoire de Physique de l'État Condensé, UPRESA CNRS 6087, Université du
Maine, 72085 Le Mans Cedex 09, France
2 Laboratoire d'Optique des Solides, UMR 7601 Université Pierre et Marie Curie, 4 Place Jussieu 75252 Paris Cedex 05, France
Corresponding author: email@example.com
Revised: 21 December 1999
Accepted: 28 December 1999
Published online: 15 February 2000
Granular Fe-V2O5 thin films with different iron concentrations prepared by means of radiofrequency magnetron co-sputtering technique were investigated by means of X-ray diffraction, Transmission Electron Microscopy and 57Fe Mössbauer spectrometry as a function of iron concentration. A common experimental feature reveals that a percolation-like threshold occurs at around 23−25% atomic Fe. Below such a critical value, the co-sputtering process favours the presence of ultrafine amorphous oxide grains with sizes lower than 10 nm embedded in a vanadium oxide matrix. Above, one clearly observes the presence of fine grains (sizes comprised between 10−100 nm) composed of either hematite or maghemite phases dispersed in the same matrix, the set displaying a magnetic order at room temperature.
PACS: 61.16.Bg – Transmission, reflection and scanning electron microscopy (including EBIC) / 75.70.Ak – Magnetic properties of monolayers and thin films / 76.80.+y – Mössbauer effect; otherγ-ray spectroscopy
© EDP Sciences, 2000
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