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

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

Research output: Contribution to journalArticle

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 - May 2009
Externally publishedYes

Fingerprint

Ferrite
ferrites
Magnetic properties
Ions
Nanoparticles
magnetic properties
nanoparticles
ions
Magnetization
magnetization
Saturation magnetization
Curie temperature
Heavy ions
Substitution reactions
spinel
disorders
substitutes
saturation
room temperature
Temperature

Keywords

  • Curie temperature
  • Ferrites
  • Nanoparticles
  • Surface spins

ASJC Scopus subject areas

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

Cite this

Predicting a major role of surface spins in the magnetic properties of ferrite nanoparticles. / Obaidat, I. M.; Mohite, V.; Issa, B.; Tit, N.; Haik, Yousef.

In: Crystal Research and Technology, Vol. 44, No. 5, 05.2009, p. 489-494.

Research output: Contribution to journalArticle

Obaidat, I. M. ; Mohite, V. ; Issa, B. ; Tit, N. ; Haik, Yousef. / Predicting a major role of surface spins in the magnetic properties of ferrite nanoparticles. In: Crystal Research and Technology. 2009 ; Vol. 44, No. 5. pp. 489-494.
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