Document Type : Research Article
Authors
1 Nanotechnology Centre, VŠB - Technical University of Ostrava, 17. listopadu 15, Ostrava - Poruba, 70833, Czech Republic
2 Department of Chemistry, Rajiv Gandhi University of Knowledge Technologies, IIIT-Nuzvid, Andhra Pradesh 521202, India
3 Department of Physics, VŠB - Technical University of Ostrava, 17. listopadu 15, Ostrava - Poruba, 70833, Czech Republic
4 Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, Prague, 12116, Czech Republic
Abstract
Nanostructured thin films of MnFe2O4 were fabricated using chemical approach. Structural, magnetic, optical and magneto-optical properties of the films have been investigated using XRD, AFM, VSM, spectroscopic ellipsometry and MOKE spectroscopy. Structural evaluation of the thermally annealed films showed crystalline phase and spinel structure along with appearance of textured nano-crystallites at the annealing temperature (Ta) of 500 °C and above. Surface morphology of the films annealed at 600 oC was characterized using AFM and the size of MnFe2O4 particles was observed to be 70 – 180 nm with ellipsoidal morphology and the surface roughness was found to be 8 nm. Hysteresis loops of the ferrite films indicated ferromagnetic behavior for annealing temperature of 400 oC and above, with a small contribution of paramagnetic nature arising from its oxide. The films showed a semiconducting behavior for the annealing temperature (Ta) ranging from 400 - 600 oC. The magneto-optical response is found to be small, i.e., one order less when compared to CoFe2O4 or metallic Fe, Co films. The maximum magneto-optical response from MnFe2O4 thin films is found for Ta = 400 oC, i.e. for incomplete spinel structure. As the material used for making the thin film coating is of the order of very few milligrams, these highly responsive films could be used as magnetic sensors. Copyright © 2017 VBRI Press.
Keywords
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