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Electrochemical synthesis of magnetic nanostructures using anodic aluminum oxide templates.

机译：使用阳极氧化铝模板电化学合成磁性纳米结构。

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摘要

In this dissertation, template electrodeposition was employed to fabricate high quality magnetic nanostructures suited for the reliable investigation of novel spintronics phenomena such as CIMS, BMR, and CPP-GMR.; Several critical aspects/steps relating to the synthesis process were investigated in this work. In order to obtain high quality magnetic nanostructures, free-standing and Si-supported anodic aluminum oxide templates with closely controlled pore diameters, lengths, as well as constriction sizes, were synthesized by anodization, followed by appropriate post-processing. The pore opening size on the barrier layer can be controlled down to 5 nm by ion beam etching. After optimization of the compositional, structural, and magnetic properties of homogeneous FeCoNiCu layers electrodeposited under different conditions, the pulsed deposition process of FeCoNI/Cu multilayers on n-Si was studied. The influence of Cu deposition potential and Fe2+ concentration on microstructure, chemical and electrochemical properties, magnetic properties, and hence magnetotransport properties were assessed. The dissolution of the FM layer during potential transition was minimized in order to control interface sharpness. Combined with the systematic sublayer thickness and FM layer composition optimization, unprecedented GMR sensitivity of 0.11%/Oe at 5-15 Oe was obtained. Growth of multilayer nanowires was performed, and contact to a single wire was attempted using an electrochemical technique. We succeeded in addressing a small number of nanowires and measured a CPP-GMR of 17%. Template electrodeposition thus provides a promising way to repeatably fabricate prototypes for spin dependent transport studies.
机译：本论文采用模板电沉积技术制备了高质量的磁性纳米结构，适用于可靠地研究新型自旋电子学现象，如CIMS，BMR和CPP-GMR。在这项工作中，研究了与合成过程有关的几个关键方面/步骤。为了获得高质量的磁性纳米结构，通过阳极氧化合成了具有紧密控制的孔径，长度和收缩尺寸的自支撑硅支撑阳极氧化铝模板，然后进行适当的后处理。可以通过离子束蚀刻将阻挡层上的开孔尺寸控制为低至5nm。在优化了在不同条件下电沉积的均质FeCoNiCu层的组成，结构和磁性后，研究了在n-Si上脉冲沉积FeCoNI / Cu多层膜的过程。评估了铜沉积电位和Fe2 +浓度对组织，化学和电化学性能，磁性能以及因此的磁输运性能的影响。为了控制界面的清晰度，在电势过渡期间将FM层的溶解最小化。结合系统的子层厚度和FM层组成的优化，在5-15 Oe时获得了前所未有的GMR灵敏度，为0.11％/ Oe。进行多层纳米线的生长，并尝试使用电化学技术接触单根线。我们成功解决了少数纳米线问题，测得的CPP-GMR为17％。模板电沉积因此提供了一种有前途的方法来重复制造用于自旋依赖性转运研究的原型。

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  • 作者

    Gong, Jie.;

  • 作者单位

    The University of Alabama.;

  • 授予单位 The University of Alabama.;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 240 p.
  • 总页数 240
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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