Effect of dipolar interaction observed in iron-based nanoparticles

被引：202

作者：

Vargas, JM

Nunes, WC

Socolovsky, LM

Knobel, M

Zanchet, D

机构：

[1] Lab Nacl Luz Sincrotron, BR-13084971 Campinas, SP, Brazil

[2] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP, Brazil

来源：

PHYSICAL REVIEW B | 2005年 / 72卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.72.184428

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Spherical magnetic nanoparticles with narrow size distribution and organic capping were diluted in paraffin with different concentrations to verify the role of dipolar interactions on the macroscopic magnetic behavior. Increasing concentration of magnetic nanoparticles leads to higher blocking temperatures. The experimental data were analyzed by means of a recently proposed model that takes into account magnetic interactions of dipolar origin, and an excellent agreement was found. Considering the magnetic interaction among particles it was possible to obtain the real magnetic moment and estimate structural parameters that are consistent with the ones obtained by small angle x-ray scattering and transmission electron microscopy.

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页数：6

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