• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nanotechnology >Self-assembled iron oxide nanoparticle multilayer: X-ray and polarized neutron reflectivity
【24h】

Self-assembled iron oxide nanoparticle multilayer: X-ray and polarized neutron reflectivity

机译：自组装氧化铁纳米粒子多层：X射线和极化的中子反射率

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We have investigated the structure and magnetism of self-assembled, 20nm diameter iron oxide nanoparticles covered by an oleic acid shell for scrutinizing their structural and magnetic correlations. The nanoparticles were spin-coated on an Si substrate as a single monolayer and as a stack of 5ML forming a multilayer. X-ray scattering (reflectivity and grazing incidence small-angle scattering) confirms high in-plane hexagonal correlation and a good layering property of the nanoparticles. Using polarized neutron reflectivity we have also determined the long range magnetic correlations parallel and perpendicular to the layers in addition to the structural ones. In a field of 5kOe we determine a magnetization value of about 80% of the saturation value. At remanence the global magnetization is close to zero. However, polarized neutron reflectivity reveals the existence of regions in which magnetic moments of nanoparticles are well aligned, while losing order over longer distances. These findings confirm that in the nanoparticle assembly the magnetic dipoledipole interaction is rather strong, dominating the collective magnetic properties at room temperature.
机译：我们研究了油酸壳覆盖的自组装，直径为20nm的氧化铁纳米颗粒的结构和磁性，以检查它们的结构和磁性相关性。将纳米颗粒作为单个单层和5ML叠层旋涂在Si基板上，形成多层。 X射线散射（反射率和掠入射小角度散射）证实了高的面内六边形相关性和纳米颗粒的良好分层性能。使用极化中子反射率，我们还确定了除结构层外还平行于和垂直于层的远距离磁相关性。在5kOe的磁场中，我们确定磁化值约为饱和值的80％。剩磁时，总磁化强度接近零。然而，极化的中子反射率揭示了纳米粒子的磁矩排列良好的区域的存在，同时在更长的距离上失去了顺序。这些发现证实，在纳米颗粒组件中，磁偶极子偶极相互作用非常强，在室温下支配着集体的磁性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号