Valence state and spatial distribution of Fe ions in ferromagnetic Ba(Fe1-xZrx)O3-δ single-crystal films on SrTiO3 substrates
Valence state and spatial distribution of Fe ions in ferromagnetic Ba(Fe1-xZrx)O3-δ single-crystal films on SrTiO3 substrates
复制标题
DOI：
10.1063/1.2836709
复制
发表时间：
2008-02
影响因子：
3.2
通讯作者：
T. Matsui;R. Sato;H. Tsuda
中科院分区：
文献类型：
--
作者：
T. Matsui;R. Sato;H. Tsuda
在（001）SrTiO 3单晶衬底上成功地合成了Ba（Fe 1 − xZrO 2）O3−δ单晶薄膜。该薄膜即使在室温下也表现出介电和类铁磁特性。样品的饱和磁化强度随Zr取代量的增加而增加。特别是对于x=0.8和0.9的样品，观察到铁磁有序的显着增强。X射线光电子能谱分析表明，具有强铁磁有序性的样品中含有相对较多的Fe ~（4+）离子而不是Fe ~（3+）离子。除此之外，我们揭示了在BFZO薄膜内具有富Fe成分的非常小的区域的存在。本地化的四价铁离子在这些区域引起铁磁超交换耦合推测是负责所观察到的增强磁化强度的x=0.8和0.9的样品。
Ba(Fe1−xZrx)O3−δ single-crystalline films on (001) single-crystal SrTiO3 substrate were successfully synthesized. The films exhibited dielectric and ferromagneticlike characteristics even at room temperature. The saturation magnetization of the samples increased with increasing the Zr substitution amount. Especially for the x=0.8 and 0.9 samples, significant enhancement of the ferromagnetic ordering was observed. X-ray photoelectron spectroscopic analysis revealed that the samples with strong ferromagnetic ordering contained a relatively large amount of Fe4+ ions rather than Fe3+ ions. In addition to this, we revealed the presence of the very small regions having the Fe-rich composition of BFZO within the BFZO thin film. The localized tetravalent Fe ions at these regions causing ferromagnetic superexchange coupling are speculated to be responsible for the observed enhanced magnetization of the x=0.8 and 0.9 samples.