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在薄膜Pt-(Au-) -Co异构中低温扩散:一个结构和磁性表征
Roman Pedan1, Pavlo Makushko2, Yurii Yavorskyi1
1National Technical University of Ukraine 'Igor Sikorsky Kyiv Polytechnic Institute', Prospect Beresteiskyi 37, Kyiv 03056, Ukraine.
Nanotechnology
|January 25, 2024
概括
了解- (Pt-Co) 薄膜中的扩散是先进电子和数据存储的关键. 层次顺序和金 (Au) 间层显著改变了扩散速率和强制性等磁性特性.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 纳米技术 纳米技术
背景情况:
- 多层薄膜中的热诱导扩散对于纳米电子和磁性数据存储至关重要.
- - (Co-Pt) 合金对于诸如旋转,旋转轨道扭矩装置和高密度数据存储等应用至关重要.
- 控制这些异构结构中的扩散和结构相变化对于设备的性能至关重要.
研究的目的:
- 为了研究基于Pt-Co的薄膜堆中的扩散过程.
- 分析层倒置 (Pt/Co vs. Co/Pt) 和插入金 (Au) 层对结构和磁性特性的影响.
- 量化扩散系数,了解它们对温度和微观结构的依赖.
主要方法:
- 制造Pt-Co和Pt-Co-Au多层薄膜堆.多层薄膜堆的制造.
- 在150°C至350°C的温度下进行热处理.
- 结构转变和磁性属性的表征,包括强制性测量.
- 对 (Co) 和 (Pt) 的有效扩散系数的量化.
主要成果:
- 层叠对扩散速率有很大影响,特别是在谷物边界扩散占主导地位的温度下.
- 对Co和Pt的有效扩散系数在150°C和350°C之间的10-16-10-13cm-2s-1的范围内得到量化.
- 热处理导致强制性的增强,由于近距离的化学排序.
- 一个中间的Au层通过修改谷物边界的交换合来增加冷却样品的强制场.
结论:
- Pt-Co 层的堆叠顺序极大地影响了扩散动力学和同质化速率.
- 有效的扩散系数提供了一种手段来控制Pt-Co异构结构的结构演变.
- 引入黄金中间层为调整磁性提供了一条途径,增强数据存储应用的强制性.
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To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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