Memory effects in exchange coupled Fe/Co 3O 4 nanocomposites

S. P. Pati, S. Kumar, D. Das

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Nanocomposites comprising a ferromagnet and an antiferromagnet have drawn attention recently because of their interesting physical properties and variety of technological applications. In the present work, structural, hyperfine and magnetic properties of Fe/Co 3O 4 nanocomposites prepared by a chemical route having 10-70 wt.% of Fe, have been investigated. XRD and TEM measurements confirmed polycrystalline nature of the samples having grain size in the nanometer regime. FTIR measurements show the presence of two bands of Co-O corresponding to Co 2+ and Co 3+. Mössbauer spectra recorded at room temperature confirm the presence of Fe in the blocked state. Presence of exchange bias at Fe-Co 3O 4 interfaces is confirmed by the magnetization measurements. Irreversibility in temperature dependent FC-ZFC measurements points to interface effect. Frequency dependent ac susceptibility measurements as well as memory effect observed in dc magnetization measurements indicate the superspin glass nature of the nanocomposites.

Original languageEnglish
Pages (from-to)303-309
Number of pages7
JournalMaterials Chemistry and Physics
Volume137
Issue number1
DOIs
Publication statusPublished - Nov 15 2012

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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