Magnetic Field Sensing Properties of Diluted Magnetic Semiconductor Based Nanocomposites
Magnetic Field Sensing Properties of Diluted Magnetic Semiconductor Based Nanocomposites
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稀磁半导体基纳米复合材料的磁场传感性能
DOI：
10.1166/sl.2013.2783
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
O. Savchuk
中科院分区：
文献类型：
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作者：
A. Perrone;A. I. Savchuk;H. D. Rosa;I. Stolyarchuk;V. V. Makoviy;M. M. Smolinsky;O. Savchuk
脉冲激光沉积已应用于 SiO2 基复合材料中 Cd1-x MnxTe 纳米粒子的制造。此外，胶体化学方法已用于在聚乙烯醇基复合薄膜中制备Cd1-x MnxS纳米粒子。透射电子显微镜和原子力显微镜分析证实了两种纳米复合材料的纳米结晶性，并可以估计嵌入 SiO2 和聚合物基质中的稀释磁性半导体纳米颗粒的平均直径。光谱显示由于研究样品中的限制效应，吸收边和激子结构发生蓝移。 Cd1-x MnxTe/SiO2 复合材料的法拉第旋转光谱表现出与限制效应和 sp-d 交换相互作用相关的特性。相比之下，在 Cd1-x MnxS/聚乙烯醇复合材料中没有观察到法拉第旋转的增强。获得的结果表明，基于稀释磁性半导体的纳米复合材料是用于脉冲高磁场测量的基于法拉第效应的磁传感器的有前途的材料。
Pulsed laser deposition has been applied for the fabrication of Cd1–x MnxTe nanoparticle in SiO2 matrix composite material. In addition, colloid chemistry methods have been used to prepare Cd1–x MnxS nanoparticle in polyvinylalcohol matrix composite films. Transmission electron microscopy and atomic force microscopy analyses confirmed the nanocrystallinity of both kinds of nanocomposites and allowed an estimate of the average diameter of diluted magnetic semiconductor nanoparticles embedded into SiO2 and polymer matrices. Optical spectra reveal a blue shift in the absorption edge and the exciton structure due to confinement effects in the studied samples. Faraday rotation spectra of the Cd1–x MnxTe/SiO2 composite demonstrate peculiarities, which are associated with both confinement effects and sp–d exchange interactions. In contrast, no enhancement of the Faraday rotation was observed in Cd1–x MnxS/polyvinylalcohol composites. The results obtained suggest that diluted magnetic semiconductor based nanocomposites are promising materials for Faraday effect based magnetic sensors for pulsed high magnetic fields measurements.