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Structural characterization on composite materials of magnetic ultra-fine particles using Conversion Electron Mossbauer Spectroscopy with applied magnetic field

使用外加磁场的转换电子穆斯堡尔能谱对磁性超细颗粒复合材料进行结构表征

基本信息

批准号：
14550679
负责人：
TORIYAMA Tamotsu
金额：
$ 1.79万
依托单位：
Musashi Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

The research results of this project are summarized as follows:1) The performances of "Measurement system for Conversion Electron Mossbauer Spectroscopy(CEMS) with applied magnetic field" have been done using 1x10^<17> ^<57>Fe-implanted Al_2O_3 granular film. These results will be presented in 41st annual meetings on radioisotopes in the physical sciences and industries as well as scientific lectures (7/6/2004).2) The size distribution of α-Fe superparamagnetic particles in Fe-implanted Al_2O_3 (sapphire) granular film have been measured using CEMS with applied magnetic field, in order to search for the most suitable conditions on the doses of Fe ion implantation and moderate annealing. The results have been presented in IUMRS-ICAM2003 held at Yokohama, 10/10/2003 (ref. 3).3) In order to search for the origin of the difference between TMR effects for sputtered Fe-Al-O and Fe-implanted Al_2O_3 granular films, the iron ionic states and the size distributions for a-Fe particles in sputtered Fe-Al-O granular TMR films have investigated using CEMS without and with applied magnetic fields. This result was submitted to 2nd Seeheim Conference on Magnetism held at Seeheim, Germany. It has been accepted and the contribution is now in review process (ref.4).4) It was found by Hayashi et al. that the superparamagnetic nano-sized particles can be formed by sequential implantation of Fe and Co ions to Al_2O_3 crystal (ref. 2). Also it was observed that the MR ratio (12%) for Fe-Co-implanted Al_2O_3 granular film is larger than that (8%) for Fe-implanted one. Then, CEMS measurements with applied magnetic field for these samples are now performed.

本课题的主要研究成果如下：1）利用1 × 10 ~（-1）Fe离子注入Al_2O_3颗粒膜，完成了“外加磁场转换电子穆斯堡尔谱（CEMS）测量系统”的性能测试<17><57>。这些结果将在第41届物理科学和工业放射性同位素年会以及科学讲座上发表。（7/6/2004）. 2）Fe离子注入Al_2O_3中α-Fe超顺磁性粒子的尺寸分布（蓝宝石）颗粒膜已经使用具有外加磁场的CEMS测量，寻找最适宜的Fe离子注入剂量和适度退火条件。研究结果已在2003年10月10日于横滨举行的IUMRS-ICAM 2003上发表（3）为了寻找溅射Fe-Al-O颗粒膜和注入Fe的Al_2O_3颗粒膜的TMR效应差异的原因，研究了溅射Fe-Al-Al合金中α-Fe粒子的铁离子状态和尺寸分布。用CEMS研究了无磁场和有磁场条件下O颗粒TMR薄膜的结构。这一结果已提交给在德国塞海姆举行的第二届塞海姆磁学会议。4）Hayashi等人发现，Fe和Co离子顺序注入Al_2O_3晶体中，可以形成超顺磁性纳米粒子（参考文献2）。Fe-Co离子注入Al_2O_3颗粒膜的MR比（12%）大于Fe离子注入的MR比（8%）。然后，现在对这些样品进行施加磁场的CEMS测量。