基于巨磁阻锰氧化物的核壳纳米线的高效合成与电子学研究。

Efficient synthesis and electronic studies of core-shell nanowires based on colossal magnetoresistive manganites.

作者信息

Lei Bo, Li Chao, Zhang Daihua, Han Song, Zhou Chongwu

机构信息

Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, USA.

出版信息

J Phys Chem B. 2005 Oct 13;109(40):18799-803. doi: 10.1021/jp053334p.

DOI:10.1021/jp053334p

PMID:16853419

Abstract

We report our recent study on the pulsed laser deposition process in the synthesis of colossal magnetoresistive MgO/LaCaMnO3 and MgO/LaSrMnO3 core-shell nanowires. A highly efficient process has been developed by depositing an epitaxial layer of manganite onto randomly oriented MgO nanowires grown on SiO2/Si substrates. In addition, in-depth studies revealed that the sample-target distance played a critical role in determining the core-shell nanowire quality. The MgO/LaCaMnO3 and MgO/LaSrMnO3 nanowires opened up the unique opportunity to explore a number of intriguing physical properties at the nanoscale. Remarkable metal-insulator phase transitions and pronounced colossal magnetoresistance have been observed in both LaCaMnO3 and LaSrMnO3 nanostructures.

摘要

我们报告了我们最近关于在合成巨磁阻MgO/LaCaMnO3和MgO/LaSrMnO3核壳纳米线中脉冲激光沉积过程的研究。通过在生长于SiO2/Si衬底上的随机取向MgO纳米线上沉积一层外延锰氧化物层，开发出了一种高效工艺。此外，深入研究表明，样品与靶材的距离在决定核壳纳米线质量方面起着关键作用。MgO/LaCaMnO3和MgO/LaSrMnO3纳米线为在纳米尺度探索许多有趣的物理性质提供了独特机会。在LaCaMnO3和LaSrMnO3纳米结构中均观察到了显著的金属-绝缘体相变和明显的巨磁阻现象。