Kuciakowski Juliusz, Kmita Angelika, Lachowicz Dorota, Wytrwal-Sarna Magdalena, Pitala Krzysztof, Lafuerza Sara, Koziej Dorota, Juhin Amélie, Sikora Marcin
AGH University of Science and Technology, Academic Centre for Materials and Nanotechnology, Al. Mickiewicza 30, 30-059 Krakow, Poland.
European Synchrotron Radiation Facility, CS40220, 38043 Grenoble Cedex 9, France.
Nanoscale. 2020 Aug 13;12(31):16420-16426. doi: 10.1039/d0nr02866e.
We show that the properties of superparamagnetic iron oxide nanoparticles suspended in liquids can be effectively studied using Magnetic Circular Dichroism in Resonant Inelastic X-ray Scattering. Analysis of the spectral shape and magnetic contrast produced by this experiment enables an assessment of the site distribution and magnetic state of metal ions in the spinel phase. The selective magnetization profile of particles as derived from the field dependence of dichroism empowers an estimation of particle size distribution. Furthermore, the new proposed methodology discriminates sizes that are below the detection limits of X-ray and light scattering probes and that are difficult to spot in TEM.
我们表明，利用共振非弹性X射线散射中的磁圆二色性可以有效地研究悬浮在液体中的超顺磁性氧化铁纳米颗粒的性质。对该实验产生的光谱形状和磁对比度进行分析，能够评估尖晶石相中金属离子的位点分布和磁态。由二色性的场依赖性得出的颗粒选择性磁化分布有助于估计颗粒尺寸分布。此外，新提出的方法能够区分低于X射线和光散射探针检测限且难以在透射电子显微镜中发现的尺寸。
