Synergy-induced enhancement of magnetic properties in α-Fe2O3/Ni1+xFe2-xO4 nanocomposites: role of Ni2+ and annealing temperature

S. Jena, D. K. Mishra, C. J. Sheppard, A. R.E. Prinsloo, D. Behera, P. Mohanty, S. Rana, P. Mallick

Research output: Contribution to journalArticlepeer-review


The effect of thermal annealing on the structural, optical and magnetic properties of α-Fe2O3/Ni1+xFe2-xO4 (x = 0.05 and 0.10) nanocomposites was probed through different characterization techniques. The structural study revealed the formation of nanocomposite samples because of the co-existence of both α-Fe2O3 and NiFe2O4 phases. The NiFe2O4 phase in the nanocomposite increased with the increase of both Ni2+ and annealing temperatures. The morphological study reveals the presence of agglomerated irregular elliptical particles. The optical band gap of the samples remains unchanged with the increase of Ni2+ and annealing temperature. All the synthesized samples display effective exchange coupling and ferromagnetic features at room temperature. The magnetization of these systems increases with increasing NiFe2O4 phase and the progressive increase in magnetization is observed for the nanocomposites annealed at higher temperatures. The magnetization study at different temperatures revealed that there exists a critical measuring temperature for individual samples beyond which the magnetization starts reducing. The exchange bias in the nanocomposite samples depends on effective coupling between α-Fe2O3 and NiFe2O4 phases and the same is higher for the samples with x = 0.05.

Original languageEnglish
Pages (from-to)18096-18110
Number of pages15
JournalJournal of Materials Science: Materials in Electronics
Issue number22
Publication statusPublished - Aug 2022

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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