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
• 负责人: TAKEDA Mahoto
• 金额: $ 2.3万
• 依托单位: Yokohama National University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550650/
• 关键词: nano-scale magnetic particle; Copper-cobalt aIloy; precipitation process; Magnetic domain structure

The present research group revealed that the precipitation behavior in a Cu-Co alloy is affected by the magnetic interaction between cobalt atoms/ clusters. Since few systematic works have been accumulated so far, details and fundamental understanding of the phenomena has not obtained yet. The present study consists of the following parts ; (1) TEM study of the influence of the magnetic field externally applied to the alloy specimen, (2) magnetic measurements to investigate the relationship of the magnetic domain structure and magnetic property, (3) the Monte Carlo simulation to consider the influence of the field to the Co-particle formation and (4) Lorentz microscopy of the domain structure.The precipitation of the solute was accelerated by applying the magnetic field, although the shapes of the particles did not receive the influence. Teh influence of the field more explicitly appeared at the later stage of the precipitation. The critical size to coherent-incoherent transition of the precipitate is likely to receive slight influence. The magnetic moment of the alloy specimen was affected with the microstructure of the specimen. The specimen containing Co-clusters shows a M-T curve dependent of the existence of the field. An incoherent Co-precipitate comprised multiple magnetic domains to reduce the electrostatic energy.

本研究小组揭示了铜钴合金中的析出行为受到钴原子/簇之间的磁相互作用的影响。由于迄今为止积累的系统著作较少，尚未获得对这一现象的细节和基本认识。本研究由以下部分组成； (1) TEM 研究外部磁场对合金试样的影响，(2) 磁测量研究磁畴结构和磁性能的关系，(3) 蒙特卡罗模拟考虑磁场的影响(4) 域结构的洛伦兹显微镜。施加磁场加速了溶质的沉淀，尽管颗粒的形状没有受到影响。场的影响在降水的后期表现得更加明显。沉淀物相干-非相干转变的临界尺寸可能会受到轻微影响。合金试样的磁矩受试样微观结构的影响。含有共团簇的样本显示出取决于场的存在的 M-T 曲线。非共格共沉淀物包含多个磁畴以减少静电能。

项目成果

M.Takeda, H.Yamada, S.Yoshida, K.Shimasue, T.Endo, J.Van Landuyt: "TEM Study and Monte-Carlo simulation of nano-scale Co particles precipitated in a Cu matrix"Physica status solidi (a). 198No.2. 436-442 (2003)

M.Takeda、H.Yamada、S.Yoshida、K.Shimasue、T.Endo、J.Van Landuyt：“铜基体中沉淀的纳米级 Co 粒子的 TEM 研究和蒙特卡罗模拟”物理状态固体（a

M.Takeda, H.Yamada, S.Yoshida, K.Shimasue, T.Endo, J.Van Landuyt: "TEM Study and Monte-Carlo simulation of nano-scale Co particles precipitated in a Cu matrix"Physica status solidi(a). 198, 2. 436-442 (2003)

M.Takeda、H.Yamada、S.Yoshida、K.Shimasue、T.Endo、J.Van Landuyt：“铜基体中沉积的纳米级 Co 颗粒的 TEM 研究和蒙特卡罗模拟”物理状态固体（a

M.Takeda, H.Yamada, S.Yoshida, K.Shimasue, T.Endo, J.Vanlanduyt: "TEM study and Monte-Carlo simulation of nano-scale Co particles precipitated in a Cu matirx"physica status solidi (A). 198. 436-442 (2003)

M.Takeda、H.Yamada、S.Yoshida、K.Shimasue、T.Endo、J.Vanlanduyt：“Cu 基质中沉淀的纳米级 Co 颗粒的 TEM 研究和蒙特卡罗模拟”物理状态固体 (A)