Formation of Nano-structure Material Using Chaotic Theory and its Physical Properties

混沌理论纳米结构材料的形成及其物理性质

• 批准号: 07455300
• 负责人: ISHIHARA Keiichi
• 金额: $ 4.99万
• 依托单位: KYOTO 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 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455300/
• 关键词: chaos; mechanical alloying; sputter; repeated deformation; alloying; kinetics; キネティスク

It is reported that the formation of Fe-Ag nano-layred material can be produced by repeated pressing and rolling ; the repeated plastic deformation of powder and foil. The specimen producedby the repeated rolling is observed the giant magneto-resistance (GMR). The GMR effect has been only reported in the multilayr material the each layr thickness of which is less than 1nm. While the specimen produced by the repeated rolling shows GMR effect, even if the thickness is about 50nm.In this research, the multilayr samples whose layr thickness from 10nm to 100nm were produced by magnetron sputtering. In these material, only 10nm sample shows GMR,0.15% at 77K.While the 70nm sample produced by the repeatedrolling shows GMR,4.5% at 77K.Since the samples produced by the repeated rolling have the distributed layr thickness, The inhomogeneous multilayr sample produced by sputtering is produced. Each layr thickness was simulated by the value which was measured in the repeated rolling sample. This sample shows GMR,1.5% at 77K.Consequently, GMR of homogeneous multilayr sample is larger than that of chaotic multilayr sample.

据悉，通过反复压制、滚压可形成Fe-Ag纳米层状材料；粉末和箔片的反复塑性变形。观察反复滚动产生的样品的巨磁阻（GMR）。 GMR效应仅在每层厚度小于1nm的多层材料中被报道。而通过反复滚压制作的样品，即使厚度约为50nm，也表现出GMR效应。本研究采用磁控溅射技术制作了层厚为10nm至100nm的多层样品。在这些材料中，只有10nm样品在77K时表现出GMR，0.15%。而通过重复轧制生产的70nm样品在77K时表现出GMR，4.5%。由于通过重复轧制生产的样品具有分布的层厚度，因此产生了通过溅射生产的不均匀多层样品。每个层的厚度通过重复轧制样品中测量的值来模拟。该样品在 77K 时显示 GMR，1.5%。因此，均匀多层样品的 GMR 大于混沌多层样品的 GMR。

项目成果

K. N. Ishihara: "Generation of Chaotic Structure by the Repetition of Cold Working" Solid State Phenomena. 42-43. 77-86 (1995)

K. N. Ishihara：“通过重复冷加工产生混沌结构”固态现象。