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Fabrication of self-assembled lateral nanostructures and their applications for magnetic materials

自组装横向纳米结构的制备及其在磁性材料中的应用

基本信息

批准号：
16206067
负责人：
TAKANASHI Koki
金额：
$ 32.12万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

Magnetic nanostructures with lateral modulation were prepared by molecular beam epitaxy and UHV magnetron sputtering, and their magnetic, magnetotransport and magnetooptical properties etc. were investigated. The main results obtained in this study are as follows:1.Self assembled Fe nanoparticles were formed on a thin MgO layer which is epitaxially grown on a Fe buffer with an optimum thickness, and it was found by scanning tunneling microscopy observations that the Fe nanoparticles were alingned in a [110] direction. Cross sectional high-resolution electron microscopy observation suggested that an aligned pyramid structure of the Fe buffer caused the lateral alignment of Fe nanoparticles.2.Preparation of FePt films on FeAl single crystal surfaces with nano.pores were attempted by using both bulk and thin film processes. Magnetic properties of obtained FePt films were measured and the effects of pores on properties of FePt films were systematically investigated.3.By optimized heat treatments for alternate stacking of FePt and MgO, tetrahedral FePt nanoparticles embedded partially in MgO were successfully synthesized. The formed FePt nanoparticles showed a large coercive force, suggesting an application of magnetic probe microscopy.4.Novel surface structures such as rectangular holes and network structures were successfully prepared for NiO thin films by oxygen reactive sputtering. The observed structures are expected to be used for a template for lateral nanostructures.5.Surface phase separation was investigated for ultrathin Fe-Au alloys deposited on a Pt(100) surface. A few kinds of novel lateral nanostructures were observed by scanning tunneling micropcopy.

采用分子束外延和超高真空磁控溅射技术制备了具有横向调制功能的磁性纳米结构，并对其磁性、磁输运和磁光等性质进行了研究。本研究的主要结果如下：1.在Fe缓冲层上外延生长的MgO薄膜上形成了自组装Fe纳米颗粒，扫描隧道显微镜观察发现Fe纳米颗粒沿[110]方向排列。截面高分辨电镜观察表明，Fe缓冲层的金字塔结构导致Fe纳米颗粒的横向排列。2.采用体相法和薄膜法在具有纳米孔的FeAl单晶表面制备了FePt薄膜。通过优化热处理工艺，使FePt和MgO交替堆叠，成功制备了部分嵌入MgO中的四面体FePt纳米颗粒。制备的FePt纳米颗粒具有很大的矫顽力，表明磁性探针显微镜的应用。4.采用氧反应溅射法成功制备了NiO薄膜的矩形孔和网状结构等新型表面结构。所观察到的结构有望用作侧向纳米结构的模板。5.研究了沉积在Pt（100）表面的Fe-Au合金的表面相分离。利用扫描隧道显微镜观察到了几种新型的横向纳米结构。