EPR spectra analysis of photo-magnetic properties of EuO nanocrystals

被引：5

作者：

Hasegawa, Y ^{[1
]}

Wada, Y ^{[1
]}

Yanagida, S ^{[1
]}

机构：

[1] Osaka Univ, Grad Sch Engn, Suita, Osaka 5650871, Japan

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2006年 / 408卷

关键词：

nanostructure; magnetic measurements; electron paramagnetic resonance;

D O I：

10.1016/j.jallcom.2005.04.160

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

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 p for the 4f(7) 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. (c) 2005 Elsevier B.V. All tights reserved.

引用

页码：207 / 211

页数：5

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