Structural and magnetic deconvolution of FePt/FeOx-nanoparticles using x-ray magnetic circular dichroism
Structural and magnetic deconvolution of FePt/FeOx-nanoparticles using x-ray magnetic circular dichroism
复制标题
使用 X 射线磁圆二色性对 FePt/FeOx 纳米粒子进行结构和磁解卷积
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
L. Manna
中科院分区：
文献类型：
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作者：
D. Nolle;E. Goering;T. Tietze;G. Schütz;A. Figuerola;L. Manna
近年来，纳米磁铁矿因其在光学、磁性和催化等方面的技术潜力而备受关注。特别是，混合纳米晶体的磁性可以通过互补磁性材料（例如磁铁矿和FePt）的组合来定制。为了分析所得到的双组分体系的相关磁性和结构性质，我们在室温和低温下，在总电子产率和透射模式下，同时进行了Fe L2,3边缘的x射线吸收和x射线磁性圆二色性研究。这特别提供了体积和表面相关属性的分离。所研究的体系由FePt/FeOx混合纳米晶体组成，可以独特地调整尺寸和体积比。这些测量与磁强计和高分辨率透射电子显微镜研究相结合。表面和体之间的分离是通过参考光谱的线性叠加对吸收光谱进行反褶积来完成的。利用这一普遍适用的技术，我们能够通过实验确定表面的FeOx外壳部分具有强磁化和磁铁矿特征，而内部部分更像磁铁矿。因此，这里展示的技术可以用来表征纳米粒子系统，并确定它们的结构和磁性。
Recently, magnetite nanoparticles have attracted much attention, due to their technological potential based on different optic, magnetic and catalytic sections. In particular, the magnetic properties of hybrid nanocrystals can be tailored by the combination of complementary magnetic materials like for example magnetite and FePt. In order to analyse the related magnetic and structural properties of the resulting bi-component systems, we present x-ray absorption and x-ray magnetic circular dichroism studies at the Fe L2,3 edges simultaneously performed in total electron yield and transmission mode, done at room and low temperatures. This provides in particular the separation of volume- and surface-related properties. The investigated system was made up of FePt/FeOx hybrid nanocrystals, which could be uniquely tuned in size and volume ratios. These measurements have been combined with magnetometry and high-resolution transmission electron microscopy studies. The separation between surface and bulk has been done by a deconvolution of the absorption spectra in terms of a linear superposition of reference spectra. With this universally applicable technique we are able to experimentally determine that the outer FeOx shell fraction at the surface has a strongly reduced magnetization and is of maghemite character, while the inner part is more magnetite like. So the technique shown here can be used to characterize nanoparticular systems and determine their structural and magnetic properties.
DOI：
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发表时间：
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期刊：
Environmental Science and Pollution Research International
影响因子：
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作者：
P. Wust;B. Hildebrandt;G. Sreenivasa;B. Rau;J. Gellermann;H. Riess;R. Felix;P. Schlag
通讯作者：
P. Wust;B. Hildebrandt;G. Sreenivasa;B. Rau;J. Gellermann;H. Riess;R. Felix;P. Schlag