Structural, magnetic and hyperfine properties of single-phase SrFe12O19 nanoparticles prepared by a sol-gel route

A. Das, A. Roychowdhury, S. P. Pati, S. Bandyopadhyay, D. Das

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23 Citations (Scopus)

Abstract

Single-phase nanocrystalline strontium hexaferrite (SrFe12O19) powders have been synthesized by a sol-gel method and their structural, magnetic and hyperfine properties are discussed. The optimum annealing temperature of the as-prepared gel for formation of the single-phase SrFe12O19 structure has been found to be 800°C. X-ray diffraction and Fourier transform infrared studies confirmed formation of the hexaferrite phase. The cation distribution at crystallographic inequivalent sites of the hexaferrite structure has been examined by 57Fe Mössbauer spectroscopy and found to be identical to that reported earlier. Single-phase SrFe12O19 nanoparticles (NPs) showed a magnetic hysteresis loop with high coercivity and saturation magnetization denoting an irreversible magnetization character. The temperature dependent magnetization measurements reveal a difference between the zero-field-cooled and field-cooled curves throughout the measurement range 5-300 K that is attributed to superparamagnetic relaxation of finer hexaferrite particles and disordered spins at the surface of the NPs. Both hyperfine and magnetic studies confirm that magnetic anisotropy plays a crucial role in hexaferrite NPs.

Original languageEnglish
Article number025802
JournalPhysica Scripta
Volume90
Issue number2
DOIs
Publication statusPublished - Feb 1 2015

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Mathematical Physics
  • Condensed Matter Physics
  • Physics and Astronomy(all)

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