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- Title
Synthesis of phase pure iron oxide polymorphs thin films and their enhanced magnetic properties.
- Authors
Kumar, Pawan; No-Lee, Heung; Kumar, Rajesh
- Abstract
The α-FeO thin film was prepared on liquid-vapor interface at room temperature by a facile and cost effective method, which was converted to FeO and γ-FeO films by reduction and oxidation process. The morphological and structural characterizations reveal the average crystallites size in α-FeO, FeO and γ-FeO films 12.8, 9.2 and 19 nm with rms roughness 4.35, 4.60 and 8.21 nm, respectively. From magnetic measurements, the α-FeO thin film shows a room temperature super-paramagnetic behavior with saturation magnetization 18 emu/cm, while FeO and γ-FeO thin films exhibit ferrimagnetic behavior with saturation magnetization values 414.5 and 148 emu/cm, respectively. A significantly higher value of saturation magnetization is observed in α-FeO film, which is trusted due to the uncompensated surface spins in the film. The converted FeO film also shows enhanced saturation magnetization due to the reduction in antiphase boundaries, whereas the magnetization in γ-FeO film decreases comparatively. The magnetic property of the γ-FeO is explained on the basis of the Fe ions vacancy at the octahedral position in its structure.
- Subjects
IRON oxide synthesis; MAGNETIC properties of thin films; COST effectiveness; LIQUID-vapor interfaces; EFFECT of temperature on thin films; MAGNETIC properties of iron oxides
- Publication
Journal of Materials Science: Materials in Electronics, 2014, Vol 25, Issue 10, p4553
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-014-2203-9