ARTICLE pubs.acs.org/JPCC
€ ssbauer, Raman, and Magnetoresistance Study Mo of Aluminum-Based Iron Oxide Thin Films S. S. Shinde,† Sher Singh Meena,‡ S. M. Yusuf,‡ and K. Y. Rajpure†,* † ‡
Electrochemical Materials Laboratory, Department of Physics, Shivaji University, Kolhapur 416004, India Solid State Physics Division, Bhabha Atomic Research Center, Mumbai ABSTRACT: Thin films of Al-based hematite iron oxide were synthesized by spray pyrolysis in aqueous medium onto the glass microslides. The compact and homogeneous distribution of grains (spindle-shaped hematite nanostructures) with varying sizes has been observed in surface morphological studies. The room temperature M€ossbauer study has been carried out to monitor the local environment around Fe cations and valence state of Fe ions. M€ossbauer and micro-Raman (low temperature) results suggest that oxygen vacancies cause cation redistribution between the interstitial sites resulting in magnetic ordering. The variation of magnetoresistance in low magnetic field (
