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.

通过分子束外延和UHV磁控溅射制备具有侧向调制的磁性纳米结构，并研究了其磁性，磁转运和磁磁性特性等。在这项研究中获得的主要结果如下：1。在薄的MGO层上形成了自我组装的Fe纳米颗粒，该薄层在具有最佳厚度的Fe缓冲液上外上一道生长，并通过扫描FE纳米粒子在[110]方向上扫描Fe纳米颗粒来发现。横截面高分辨率电子显微镜观察结果表明，Fe缓冲液的对齐的金字塔结构引起了Fe纳米颗粒的横向对齐。2。使用散装和薄膜过程，尝试使用纳米型在菲尔单晶体表面上的fept膜在菲尔单一晶体表面上进行脱落。测量了获得的FEPT膜的磁性特性，并系统地研究了孔对毛孔的影响。3。通过优化的热处理，用于对FEPT和MGO的交替堆叠，四面体FEPT纳米颗粒部分嵌入了MGO中的MoGO中部分。形成的FEPT纳米颗粒显示出较大的强制力，表明磁探针显微镜的应用。4。台面表面结构（例如矩形孔）和网络结构通过氧气反应性溅射成功制备了Nio薄膜。预计观察到的结构将用于侧向纳米结构的模板。5。截面相分离，用于沉积在PT（100）表面上的超薄FE-AU合金。通过扫描隧道微观拷贝可以观察到几种新型的侧向纳米结构。