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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >EPR spectra analysis of photo-magnetic properties of EuO nanocrystals
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EPR spectra analysis of photo-magnetic properties of EuO nanocrystals

机译：EPR纳米晶的光磁特性的EPR谱分析

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摘要

The temperature dependencies of magnetic susceptibility c of the europium oxide (EuO) nanocrystals were examined. The experimental Bohr magnetons (p) for EuO nanocrystals agreed well with the theoretical/; for the 4f7 configuration (Eu(II)). A dramatic increase in magnetization of the EuO nanocrystals under UV irradiation at room temperature was observed by photo-magnetic measurements superconducting quantum interface device (SQUID with optical fiber). This increase in magnetization under UV irradiation can be explained by the occurrence of a d-f exchange interaction of conductive electrons in the 5d band (magnetic exciton). We suggest a mechanism in which the photo-magnetization increases by the presence of an exciton band in the UV region for the polyurea-modified EuO nanocrystals. In order to confirm the magnetic exciton of EuO nanocrystals, we carried out the electron paramagnetic resonance (EPR) measurements under UV irradiation, showing the formation of photo-active species in EuO nanocrystals.
机译：检查了氧化oxide（EuO）纳米晶体的磁化率c的温度依赖性。 EuO纳米晶体的实验玻尔磁子（p）与理论4f7配置（Eu（II））。通过光磁测量超导量子界面装置（带光纤的SQUID），观察到室温下在紫外线照射下EuO纳米晶体的磁化强度显着增加。在紫外线照射下这种磁化强度的增加可以通过在5d波段（磁激子）中导电电子的d-f交换相互作用的发生来解释。我们提出了一种机制，其中聚脲改性的EuO纳米晶体的紫外区域中存在激子带，从而使光磁化强度增加。为了确认EuO纳米晶体的磁激子，我们在紫外线照射下进行了电子顺磁共振（EPR）测量，显示了EuO纳米晶体中光敏物质的形成。

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