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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.

采用分子束外延和特高压磁控溅射法制备了具有横向调制的磁性纳米结构，并对其磁性、磁输运和磁光学等性能进行了研究。本研究的主要结果如下：1。自组装的铁纳米颗粒形成在一层薄薄的MgO层上，该MgO层外延生长在具有最佳厚度的铁缓冲液上，通过扫描隧道显微镜观察发现，铁纳米颗粒沿一定方向排列[110]。横断面高分辨率电镜观察表明，铁缓冲液的排列金字塔结构导致了铁纳米颗粒的横向排列。纳米FeAl单晶表面制备FePt薄膜。采用体积法和薄膜法对孔隙进行了尝试。测试了制备的FePt薄膜的磁性能，系统地研究了孔隙对薄膜性能的影响。通过优化FePt与MgO交替堆积的热处理工艺，成功合成了部分嵌入MgO的四面体FePt纳米颗粒。形成的FePt纳米颗粒具有较大的矫顽力，提示了磁探针显微镜的应用前景。采用氧反应溅射法制备了新型的NiO薄膜表面结构，如矩形孔和网状结构。所观察到的结构有望用于横向纳米结构的模板。研究了在Pt（100）表面沉积超薄Fe-Au合金的表面相分离。利用扫描隧道显微镜观察到几种新型的横向纳米结构。