Effect of dipolar interaction observed in iron-based nanoparticles
Effect of dipolar interaction observed in iron-based nanoparticles
复制标题
DOI：
10.1103/physrevb.72.184428
复制
发表时间：
2005-11
影响因子：
3.7
通讯作者：
J. M. Vargas;W. Nunes;L. Socolovsky;M. Knobel;D. Zanchet
中科院分区：
文献类型：
--
作者：
J. M. Vargas;W. Nunes;L. Socolovsky;M. Knobel;D. Zanchet
将具有窄尺寸分布和有机封端的球形磁性纳米颗粒稀释到不同浓度的石蜡中，以验证偶极相互作用对宏观磁性行为的影响。磁性纳米颗粒浓度的增加会导致更高的封闭温度。利用最近提出的考虑偶极起源的磁相互作用的模型对实验数据进行了分析，并发现了很好的一致性。考虑到颗粒之间的磁相互作用，可以得到真实的磁矩，并估计出与小角X射线散射和透射电子显微镜相一致的结构参数。
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.