Lorentz Microscopy of nano-scale magnetic particles embedded in metal matrices

嵌入金属基质中的纳米级磁性颗粒的洛伦兹显微镜

基本信息

  • 批准号:
    16560576
  • 负责人:
  • 金额:
    $ 2.37万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
  • 财政年份:
    2004
  • 资助国家:
    日本
  • 起止时间:
    2004 至 2005
  • 项目状态:
    已结题

项目摘要

Domain structure of nano-scale magnetic particles embedded in copper matrices were studied by bright-field TEM, HRTEM and Lorentz microscopy, together with VSM and SQUID measurements. BFTEM showed that the coherent cobalt particles were transformed into incoherent precipitates at 50nm in size. After loosing the coherency, the octahedral precipitates entered into rapid coarsening. The present Lorentz microscopy detected the deviation of the incident electron beam due to the magnetization of cobalt particles. The magnitude of the deviating angles was estimated as twice as large as the value derived from a simple Lorentz force model. Lorentz EM also shows that incoherent precipitates were composed of four magnetic domains, each of which has a magnetization oriented to [100].SQUID measurements show that the magnetic properties of the specimens followed in a superparamagnetic M-T curve. But the property of the particles gradually changed into ferromagnetic. The magnetization curve once decreased just after a short annealing. Then the M curve increased with the annealing. The highest coersivity attained at the period that two coherent particles were coupled.
通过Bright Field TEM,HRTEM和Lorentz显微镜研究了嵌入铜基质中嵌入铜基质中的纳米级磁颗粒的结构域结构,以及VSM和鱿鱼测量。 BFTEM表明,相干钴颗粒的大小为50nm。松开相干性后,八面体沉淀迅速变形。目前的洛伦兹显微镜检测到由于钴颗粒的磁化而导致入射电子束的偏差。偏斜角的大小估计是从简单的洛伦兹力模型中得出的值的两倍。 Lorentz EM还表明,不一致的沉淀物由四个磁域组成,每个磁域具有针对[100]的磁化强度。但是颗粒的特性逐渐变成铁磁。短退火后,磁化曲线曾经减少。然后M曲线随退火而增加。在两个相干颗粒耦合的时期达到的最高凝聚力。

项目成果

期刊论文数量(4)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Cu-(Co/Fe)合金のナノ磁性粒子析出における組織と磁気特性の対応
Cu-(Co/Fe)合金纳米磁性颗粒沉淀结构与磁性能的对应关系
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TAKEDA Mahoto其他文献

TAKEDA Mahoto的其他文献

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{{ truncateString('TAKEDA Mahoto', 18)}}的其他基金

The relationship between microstructure and magnetic properties of nano-scale magnets formed in a copper matrix
铜基体纳米级磁体的微观结构与磁性能之间的关系
  • 批准号:
    25420689
  • 财政年份:
    2013
  • 资助金额:
    $ 2.37万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Study on the self-organizing arrangements of nano-scale magnetic particles in Cu-base alloys and their mechanisms
铜基合金中纳米级磁性颗粒的自组织排列及其机制研究
  • 批准号:
    21560683
  • 财政年份:
    2009
  • 资助金额:
    $ 2.37万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Selforganization of Co and Fe nanoparticles in annealing process and their magnetic properties
Co和Fe纳米粒子在退火过程中的自组织及其磁性能
  • 批准号:
    18560643
  • 财政年份:
    2006
  • 资助金额:
    $ 2.37万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Microstructural evolution and domain structure of cobalt particles precipitated in a cooper matrix
铜基体中沉淀钴颗粒的微观结构演变和域结构
  • 批准号:
    14550650
  • 财政年份:
    2002
  • 资助金额:
    $ 2.37万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)

相似海外基金

Development of a in-situ Lorentz microscopy in alternating magnetic field with magnetic head and probe-piezodriving specimen holder
开发具有磁头和探针压电驱动样品架的交变磁场中的原位洛伦兹显微镜
  • 批准号:
    22760528
  • 财政年份:
    2010
  • 资助金额:
    $ 2.37万
  • 项目类别:
    Grant-in-Aid for Young Scientists (B)
Study of Scanning Lorentz Force Microscopy
扫描洛伦兹力显微镜的研究
  • 批准号:
    18201016
  • 财政年份:
    2006
  • 资助金额:
    $ 2.37万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Selforganization of Co and Fe nanoparticles in annealing process and their magnetic properties
Co和Fe纳米粒子在退火过程中的自组织及其磁性能
  • 批准号:
    18560643
  • 财政年份:
    2006
  • 资助金额:
    $ 2.37万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Fundamental Study on magnetic-granular films with fine structures
精细结构磁性颗粒薄膜的基础研究
  • 批准号:
    08455142
  • 财政年份:
    1996
  • 资助金额:
    $ 2.37万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Lorentz Electron Microscopy Studies of Magnetoelasticity in Thin Nickel Films
镍薄膜磁弹性的洛伦兹电子显微镜研究
  • 批准号:
    7411677
  • 财政年份:
    1974
  • 资助金额:
    $ 2.37万
  • 项目类别:
    Standard Grant
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