Structures and Magnetic Properties of Iron Nano-Crystals Embedded in Ceramic Glass Films

陶瓷玻璃膜中铁纳米晶体的结构和磁性能

• 批准号: 07455259
• 负责人: HIROTSU Yoshihiko
• 金额: $ 4.93万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455259/
• 关键词: Iron nano-crystal; structural morphology; ceramics matrix; TEM observation; magnetic property; tunneling magnetic resistance; transfer chamber; ナノ結晶軟磁性; 磁性粒子; 粒子構造; 高分解能電子顕微鏡; ナノビーム解析

In recent years nano-granular magnetic particles embedded in insulating matrix has been attracting much interest, because of the appearance of spin-related magnetic resistance (MR) effect called "tunneling-type MR effect". However, little investigations have been made which relate nano-structures and morphologies of the magnetic particles, such as crystal structure, orientation, size, average inter-particle distance and distribution of magnetic particles, to magnetic interactions between the particles and their magnetic properties.In the present study, (1) Fe and Co nano-particles were deposited onto insulating Al_2O_3 films by electron-beam evaporation under various substrate temperatures and evaporation conditions. And their magnetic properties were discussed on the basis of structures and morphologies of the nanogranular films observed by electron microscopy. Also in this study, (2) a "transfer-chamber" was manufactured which transfers nano-granular films formed in an evaporation chamber directly into an electron microscope without specimen oxidation or contamination in air.

近年来，由于出现了与自旋相关的磁阻（MR）效应（称为“隧道型磁阻效应”），嵌入绝缘基体中的纳米颗粒磁性颗粒引起了人们的广泛关注。然而，将磁性颗粒的纳米结构和形态（例如磁性颗粒的晶体结构、取向、尺寸、平均颗粒间距离和分布）与颗粒之间的磁相互作用及其磁性特性联系起来的研究很少。在本研究中，(1)在不同的衬底温度和蒸发条件下，通过电子束蒸发将Fe和Co纳米颗粒沉积到绝缘Al_2O_3薄膜上。并根据电子显微镜观察到的纳米颗粒薄膜的结构和形貌讨论了它们的磁性能。同样在这项研究中，（2）制造了一个“转移室”，它将在蒸发室中形成的纳米颗粒薄膜直接转移到电子显微镜中，而样品不会在空气中氧化或污染。

项目成果

T.Tadaki, Y.Murai, A.Koreeda, Y.Nakata, Y.Hirotsu: "Structure and phase transformation of nano-scale particles of Fe-Ni alloys" Mater.Sci.Eng.A217/218. 235-8 (1996)

T.Tadaki、Y.Murai、A.Koreeda、Y.Nakata、Y.Hirotsu：“Fe-Ni 合金纳米级颗粒的结构和相变”Mater.Sci.Eng.A217/218。

T.Tadaki, Y.Murai, A.Koreeda, Y.Nakata, Y.Hirotsu: "Structure and phase transformation of nano-scale particles of Fe-Ni alloys" Materials Science and Engineering. A217/218. 235-8 (1996)

T.Tadaki、Y.Murai、A.Koreeda、Y.Nakata、Y.Hirotsu：“铁镍合金纳米级颗粒的结构和相变”材料科学与工程。

B.Bian, Y.Hirotsu, A.Makino: "Microstructure and magnetic property of Fe-Al203 granular films" Nanostructured Materials. (in press). (1998)

B.Bian，Y.Hirotsu，A.Makino：“Fe-Al203颗粒薄膜的微观结构和磁性能”纳米结构材料。