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Influence of substrate temperature in BiFeO3-CoFe2O4 nanocomposites deposited on SrTiO3 (0 0 1) |
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| Authors: | N Dix JM Caicedo I Fina V Skumryev J Guyonnet F Sánchez J Fontcuberta |
| Institution: | a Institut de Ciència de Materials de Barcelona-CSIC, Campus de la UAB, Bellaterra E-08193, Barcelona, Spain b Institut Catalá de Recerca i Estudis Avançats (ICREA), Barcelona, Spain c Física Aplicada i Òptica and Institut de Nanociència i Nanotecnologia (IN2UB), Universitat de Barcelona, Diagonal 647, E-08028 Barcelona, Spain d DPMC, University of Geneva, 24 Quai Ernest Ansertmet, CH 1211 Geneva 4, Switzerland |
| Abstract: | BiFeO3-CoFe2O4 epitaxial nanocomposites have been deposited on SrTiO3 (0 0 1) substrates by pulsed laser deposition. We present here a study of the influence of the deposition temperature (TS), in the 550-800 °C range, on the film composition, morphology and microstructure. Electron-probe microanalysis shows strong reduction of the Bi content in the films when increasing TS. Films prepared at TS=750 °C and above are virtually Bi-free. X-ray diffraction (XRD) data show that, due to the volatility of Bi, there is a progressive reduction in the amount of BiFeO3. The deposition temperature and the concomitant presence of FexOy spurious phases in the nanocomposites grown at high temperature promote radical changes in film morphology and magnetization. It thus follows that a temperature range suitable for controlled modification of nanocomposites morphology would be extremely narrow. |
| Keywords: | BiFeO3 Epitaxial nanostructures Multiferroics Oxide nanostructures Spinel films |
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