Maghemite Interparticle Interactions in gamma-Fe2O3/Ag nanocomposites

作者：Soares J M^*; Chaves D S; Conceicao O L A; Gurgel A L; Xavier M M Jr; Morales M A; Baggio Saitovitch E M

来源：Journal of Superconductivity and Novel Magnetism, 2013, 26(7): 2467-2470.

DOI：10.1007/s10948-012-1720-0

• Nanoparticles
• Maghemite
• Superparamagnetic
• Magnetic interactions

Maghemite and silver nanoparticles were prepared using the ionic coordination reaction technique. X-ray diffractograms (XRD) show that all the samples have a high degree of purity. The average particle sizes obtained by XRD and transmission electron microscopy (TEM) vary from 9 to 13 nm for the gamma-Fe2O3 particles and from 130 to 142 nm for the Ag particles. The magnetic properties of the samples have been studied by room-temperature DC magnetization and Mssbauer spectroscopy. These measurements indicate the presence of gamma-Fe2O3 particles with interparticle interactions of varying strength, resulting in three magnetic regimes: superparamagnetic, superparamagnetic with interactions, and blocked with interactions.

• 出版日期2013-7