STUDY OF SUPER-THIN FILMS DEPOSITED ON SEMICONDUCTOR-SUBSTRATES BY BRILLOUIN SPECTROSCOPY OF SURFACE WAVES

表面波布里渊光谱研究半导体基底上沉积的超薄膜

基本信息

批准号：
62550002
负责人：
OKA Yasuo
金额：
$ 1.41万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1989
项目状态：
已结题

项目摘要

The objective of this research project is the construction of a high performance Brillouin spectrometer and studies of super-thin films and multi-layer films grown on semiconductor substrates by using this spectrometer. The obtained results in these three years (1987-1990) is summarized as follows:1. We have developed a high performance tandem 5-pass Fabry-Perot interferometer, which can measure the Brillouin spectra of acoustic and spin waves in opaque metallic films. New attempts are made on the optics, the method of multi-pass system, the piezo-ceramic elements for fine controlling of the Fabry-Perot mirrors, and the electrical circuits. The constructed interferometer show high stability and is easy to treat even for a beginner of the spectroscopic measurements. Further antivibration table are introduced to eliminate the vibration from outside. As a result, it has been possible to make detailed Brillouin study of the metallic thin films.2. Brillouin studies have been made on the Co- … More Au-Co and Co-Nb-Co triple-layered films deposited on Si substrates. The exchange interaction between the Co layers through the nonmagnetic-metal layer is investigated, which is larger in case of the Au layer than in the Nb-layer case due to the difference of the electron density.The spin wave spectra are also measured in multi-layered films of Tb-(Fe,Co), which is fabricated for the vertical magnetic recording media. Broad asymmetric spin-wave spectra have been observed. These are composed of the multi-mode spin waves in the multi-layered structure. Quantitative interpretation has been made on the multi-mode spin wave spectra.3. Co-Pt alloy films for the horizontal magnetic recording media are prepared by sputtering. The spin wave spectra are investigated as a function of the alloy composition. The spin wave spectra in these alloy films are remarkably broadened, which is caused by the crystal grain structure of the alloy films. To elucidate the role of Pt which separates the magnetic Co-grains, the exchange interaction of the Co double-layers with the Pt interlayer has been measured. From these results, optimum conditions are studied on the alloy composition and the grain structure for the high-density magnetic recording media. Less

该研究项目的目的是建造高性能布里鲁因光谱仪以及使用该光谱仪在半导体底物上生长的超薄膜和多层膜的研究。在这三年（1987-1990）中获得的结果总结如下：1。我们已经开发了高性能的串联fabry-perot干涉仪，该干涉仪可以在不透明的金属膜中测量声学和自旋波的布里鲁因光谱。对Optics，Multi-Pass系统的方法，用于精细控制Fabry-Perot镜子的压电陶瓷元素的方法进行了新的尝试，以及电路。构造的干涉仪表现出很高的稳定性，即使对于光谱测量的初学者，也很容易治疗。引入了进一步的抗振动表以消除外部的振动。结果，有可能对金属薄膜进行详细的Brillouin研究。2。 Brillouin的研究是对SI底物沉积的更多Au-Co和Co-NB-CO三层膜的研究。研究了通过非磁性金属层之间的CO层之间的交换相互作用，在AU层的情况下，由于电子密度的差异，在AU层的情况下，在NB层的情况下，该层的交换相互作用也大。在TB-（Fe，CO）中，在垂直磁性磁性媒体的TB-（Fe，CO）中测量了自旋波光谱。已经观察到广泛的不对称自旋波光谱。这些由多层结构中的多模式自旋波组成。已经对多模式自旋波谱进行了定量解释3。用于水平磁记录介质的合金膜是通过溅射制备的。自旋波光谱是合金组成的函数。这些合金膜中的自旋波光谱被明显拓宽，这是由合金膜的晶粒结构引起的。为了阐明分离磁性磁粒的PT的作用，已经测量了CO双层与PT中间层的交换相互作用。从这些结果中，最佳条件是在合金组成和高密度磁记录介质的晶粒结构上研究的。较少的