Predicting a major role of surface spins in the magnetic properties of ferrite nanoparticles

I. M. Obaidat, V. Mohite, B. Issa, N. Tit, Y. Haik

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16 Citations (Scopus)

Abstract

Room-temperature magnetization hysterisis measurements were conducted on Mn0.5Zn0.5GdxFe(2-x)O4 ferrite nanoparticles, with x = 0, 0.5, 1.0, 1.5. The structure of this ferrite is normal spinel where the added of Gd3+ ions occupied the octahedral sites and replaces Fe3+ ions. The saturation magnetization was found to increase with the initial addition of the Gd3+ ions followed by a sharp decrease with further addition of Gd3+ ions. The Curie temperature was found to increase up to Gd3+ concentration of x = 1.0, and then decreases at x = 1.5. These results were attributed to the surface spins. Because the size of Gd3+ ions is larger than that of Fe 3+ ions, the substitution of Fe3+ ions with the Gd 3+ ions results in surface disorder which results in surface spins. A core-shell magnetization model was introduced where several factors were combined to explain our results.

Original languageEnglish
Pages (from-to)489-494
Number of pages6
JournalCrystal Research and Technology
Volume44
Issue number5
DOIs
Publication statusPublished - 1 May 2009

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Keywords

  • Curie temperature
  • Ferrites
  • Nanoparticles
  • Surface spins

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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