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Surfactant-mediated control of the interface structure and solid-state properties of metallic multilayers

表面活性剂介导的金属多层界面结构和固态特性的控制

基本信息

批准号：
14350339
负责人：
YAMAMOTO Ryoichi
金额：
$ 9.54万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350339/
关键词：
Surfactant Epitaxy Thin Films Metallic multilayer Crystal Growth Seeded Epitaxy Giant Magnetoresistance Sputter Deposition Surfactant Epitaxy Thin Films Metallic multilayer Crystal Growth Seeded Epitaxy Giant Magnetoresistance Sp

项目摘要

We have investigated the surfactant effect of Bi on the homoepitaxial growth of Fe and the heteroepitaxial growth of Cr on Fe(100). Bi enhances the interlayer transport in the growth of Fe and Cr on Fe(100) by decreasing surface mobility, and layer-by-layer growth is facilitated. The dependence of the growth on Bi layer thickness suggests that there exists a suitable amount of Bi surfactant layer that enhances smoother layered growth. The surface segregation of Bi during growth is prominent, and we conclude that a large number of Bi atoms are present on the top of the surface.We have investigated the surfactant effect of Bi on the heteroepitaxial growth of Fe/Cr multilayers on Fe(100) surface by MBE and sputter deposition. Predeposition of a small amount of Bi surfactant enhances the layered growth of Fe/Cr multilayer. From these results, we concluded that Bi atoms acted as an effective surfactant in the Fe/Cr multilayer growth. The interface structures of Fe/Cr multilayer with Bi surfactant are sharper than that of multilayer without. Bi. The magnetoresistance ratio of the Fe/Cr multilayer with Bi was larger than that of the multilayer without Bi. These results imply that the sharpness of interfaces mediated by Bi surfactant can be related to the large GMR effect.We have also investigated the surfactant effect on the other system, Au/Co and Cu/Co, like as the Fe/Cr case. All of these results indicate that Bi surfactant enhances the interlayer transport in the growth of adatoms on metal substrates by decreasing surface mobility, and layer-by-layer growth is facilitated. These results mean that the surfactant would be effective in changing the interface structures of metallic multilayers, and that one can artificially control the magnetic property of multilayer using the surfactant species.

研究了Bi对Fe（100）同质外延生长和Cr异质外延生长的表面活性作用。Bi通过降低表面迁移率来增强Fe和Cr在Fe（100）上生长的层间输运，并且促进逐层生长。生长对Bi层厚度的依赖性表明存在适量的Bi表面活性剂层，其增强更平滑的层状生长。Bi在Fe（100）表面异质外延生长Fe/Cr多层膜的过程中，Bi的表面偏聚现象比较明显，并且在Fe（100）表面上存在大量的Bi原子。少量Bi表面活性剂的预沉积促进了Fe/Cr多层膜的分层生长。从这些结果中，我们得出结论，Bi原子作为一个有效的表面活性剂在Fe/Cr多层膜的生长。添加Bi表面活性剂的Fe/Cr多层膜的界面结构比未添加Bi表面活性剂的Fe/Cr多层膜的界面结构尖锐。双性恋含Bi的Fe/Cr多层膜的磁电阻比大于不含Bi的多层膜的磁电阻比。这些结果表明，由Bi表面活性剂介导的界面的尖锐性可能与大的巨磁电阻效应有关。我们还研究了表面活性剂对其他体系（Au/Co和Cu/Co）的影响，就像Fe/Cr的情况一样。所有这些结果表明，Bi表面活性剂通过降低表面迁移率来增强金属衬底上吸附原子生长的层间输运，并且促进逐层生长。这些结果表明，表面活性剂将是有效的，在改变金属多层膜的界面结构，人们可以人为地控制多层膜的磁性使用的表面活性剂物种。