Mixed spinel structure in nanocrystalline NiFe2O4

C. N. Chinnasamy, A. Narayanasamy, N. Ponpandian, K. Chattopadhyay, K. Shinoda, B. Jeyadevan, K. Tohji, K. Nakatsuka, T. Furubayashi, I. Nakatani

Research output: Contribution to journalArticlepeer-review

385 Citations (Scopus)


Nanocrystalline NiFe2O4 spinel has been synthesized with various grain sizes by high-energy ball milling. From the high-field magnetization studies and extended x-ray-absorption fine-structure, and Mössbauer measurements in an external magnetic field of 5 T applied parallel to the direction of gamma rays, we could observe that Ni2+ ions occupy tetrahedral sites on grain-size reduction due to milling. The Fe3+ spins have a canted structure and the canting angle increases with grain-size reduction. It is possible that the core Fe3+ spins are also canted because of the magnetocrystalline anisotropy introduced by the occupancy of the Ni2+ ions in the tetrahedral sites.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number18
Publication statusPublished - 2001 Apr 20

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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