Abstract
This report investigates the phase evolution pathway of magnetite nanocrystal synthesis on oxide-supported substrates. A template-free phase separation approach, which exploits the thermodynamic instability of ternary perovskite BiFeO3 and inherent volatility of bismuth oxide in low oxygen pressure and high temperature is presented. The formation of an intermediate hematite nanocrystal phase is found as a key step that controls the eventual size and morphology of the magnetite nanocrystals. X-ray absorption spectra measurements and X-ray magnetic circular dichroism confirm that the spectral fingerprints of the magnetite nanocrystals match with that of bulk crystals. Magnetic measurements show that magnetic anisotropy is directly attributed to the nanocrystal morphology.
Original language | English |
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Article number | 104321 |
Journal | Journal of Applied Physics |
Volume | 112 |
Issue number | 10 |
DOIs | |
Publication status | Published - 2012 Nov 15 |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy