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

doi:10.1002/crat.200900022

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

Research output: Contribution to journal › Article › peer-review

28 Citations (Scopus)

Abstract

Room-temperature magnetization hysterisis measurements were conducted on Mn_0.5Zn_0.5Gd_xFe_(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 language	English
Pages (from-to)	489-494
Number of pages	6
Journal	Crystal Research and Technology
Volume	44
Issue number	5
DOIs	https://doi.org/10.1002/crat.200900022
Publication status	Published - May 2009

Keywords

Curie temperature
Ferrites
Nanoparticles
Surface spins

ASJC Scopus subject areas

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

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10.1002/crat.200900022

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title = "Predicting a major role of surface spins in the magnetic properties of ferrite nanoparticles",

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.",

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author = "Obaidat, {I. M.} and V. Mohite and B. Issa and N. Tit and Y. Haik",

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doi = "10.1002/crat.200900022",

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AU - Obaidat, I. M.

AU - Mohite, V.

AU - Issa, B.

AU - Tit, N.

AU - Haik, Y.

PY - 2009/5

Y1 - 2009/5

N2 - 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.

AB - 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.

KW - Curie temperature

KW - Ferrites

KW - Nanoparticles

KW - Surface spins

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

Abstract

Keywords

ASJC Scopus subject areas

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