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The fabrication of heusler alloy thin films from multiphase targets using pulsed laser deposition.

机译:使用脉冲激光沉积从多相靶材制造Heusler合金薄膜。

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摘要

In this project, we have explored the possibility of growing high quality Heusler alloy thin films from multiphase targets. Bulk targets were found to be partially formed, i.e. not of homogeneous L21 structure, through x-ray diffraction measurements. Pulsed laser deposition is a technique that can provide a congruent transfer of material from the target to the substrate, even in some cases where the target is not of a single crystalline phase. It was the objective of this work to determine whether L21 structured thin films of Co2MnAsxGe(1-x) could be grown from multiphase targets.;Measurements have been carried out to study the magnetic and structural properties of the Heusler alloys Co2MnAsxGe(1-x) . The optimization parameters that were investigated were substrate type, growth temperature, laser parameters, film thickness, and other common deposition parameters. Temperature-dependent magneto-optic Kerr effect (MOKE) techniques were used to study the qualitative magnetic properties. Alternating current (AC) susceptibility (using a MOKE technique) measurements were made as a function of temperature to view the second-order transition and obtain the Curie temperatures. Frequency dependent AC susceptibility was measured to determine the frequency dependence of the AC susceptibility for Co 2MnAsxGe(1-x).
机译:在这个项目中,我们探索了从多相靶材生产高质量Heusler合金薄膜的可能性。通过X射线衍射测量发现大块目标部分地形成,即不是均匀的L21结构。脉冲激光沉积是一种技术,即使在靶标不是单晶相的某些情况下,也可以提供从靶标到衬底的一致的材料转移。这项工作的目的是确定是否可以从多相靶材生长L21结构的Co2MnAsxGe(1-x)薄膜。;已经进行了测量以研究Heusler合金Co2MnAsxGe(1-x)的磁性和结构性能)。研究的优化参数是衬底类型,生长温度,激光参数,膜厚度和其他常见沉积参数。温度相关的磁光克尔效应(MOKE)技术用于研究定性磁性能。测量交流电(AC)的磁化率(使用MOKE技术)作为温度的函数,以查看第二阶跃迁并获得居里温度。测量频率相关的交流磁化率,以确定Co 2MnAsxGe(1-x)的交流磁化率的频率相关性。

著录项

  • 作者

    Patton, Heather M. A.;

  • 作者单位

    Southern Illinois University at Carbondale.;

  • 授予单位 Southern Illinois University at Carbondale.;
  • 学科 Physics Electricity and Magnetism.;Physics Optics.;Physics Condensed Matter.
  • 学位 M.S.
  • 年度 2009
  • 页码 73 p.
  • 总页数 73
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 电磁学、电动力学;光学;
  • 关键词

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