The role of aggregation of ferrite nanoparticles on their magnetic properties

I. M. Obaidat, B. Issa, Yousef Haik

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We have studied the magnetic properties of aggregates of Mn 0.5Zn 0.5Gd xFe (2-x)O 4 ferrite nanoparticles, with x = 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.10, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.18, 0.20. The scanning electron microscopy micrographs show significant aggregation of the nanoparticles in all samples. Zero field cooled and field cooled magnetization measurements were conducted on all samples from 400 K down to 5 K. Most zero field cooled curves were found to exhibit the usual behavior but with wide peaked regions. For some x values, the field cooled magnetization was found to increase slowly with decreasing temperature, and becomes nearly constant at low temperatures. The measurements of magnetization versus applied magnetic field were conducted on all samples at 5 K and 305 K in the field range from-15000 to 15000 Oe. At 305 K the magnetization for all samples was observed to saturate, while at 5 K the magnetization did not reach saturation for some values of x. The saturation magnetization values were suggested to be proportional to the size of particles. These results were discussed and suggested to be due to the inter-particle dipolar and exchange interactions between the particles in the aggregates, the large particle size distribution and the surface magnetization effects.

Original languageEnglish
Pages (from-to)3882-3888
Number of pages7
JournalJournal of Nanoscience and Nanotechnology
Volume11
Issue number5
DOIs
Publication statusPublished - May 2011
Externally publishedYes

Fingerprint

Particle Size
Nanoparticles
Ferrite
ferrites
Magnetization
Magnetic properties
Agglomeration
magnetic properties
nanoparticles
magnetization
Temperature
Magnetic Fields
Electron Scanning Microscopy
Particle interactions
saturation
Exchange interactions
Saturation magnetization
Particle size analysis
Particles (particulate matter)
ferrite

Keywords

  • Dipolar interaction
  • Magnetization
  • Nanoparticles

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Chemistry(all)
  • Materials Science(all)
  • Bioengineering
  • Biomedical Engineering

Cite this

The role of aggregation of ferrite nanoparticles on their magnetic properties. / Obaidat, I. M.; Issa, B.; Haik, Yousef.

In: Journal of Nanoscience and Nanotechnology, Vol. 11, No. 5, 05.2011, p. 3882-3888.

Research output: Contribution to journalArticle

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