| Project/Area Number |
62550473
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Physical properties of metals
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| Research Institution | Nagaoka University of Technology |
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Principal Investigator |
HIROTSU Yoshihiko Assistant Professor of Nagaoka University of Technology, 工学部, 助教授 (70016525)
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| Co-Investigator(Kenkyū-buntansha) |
ICHINOSE Yukio Professor of Nagaoka University of Technology, 工学部, 教授 (00115099)
INOUE Yasunobu Assistant Professor of Nagaoka University of Technology, 分析計測センター, 助教授 (30016133)
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| Project Period (FY) |
1987 – 1988
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1988: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1987: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | Solid-State Amorphization / Multi-Layered Co-Zr Films / High Resolution Electron Microscopy / 金属積層膜 |
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| Research Abstract |
In recent years, amorphization of metals by solid state reaction process has been paid much attention as a diffusion-controlled amorphization method different from usual vapor or liquid-quenching methods. Although various alloy systems which enable the solid-state amorphization have been discovered since the first discovery in 1983, detailed structural investigations in the amorphization process have not been made especially at an atomic level. In this study, structural changes of multi-layered Co-Zr and also Ni-Zr thin films in the amorphization process on low temperature annealing have been investigated by high resolution electron microscopy and electron diffraction. These structural changes were compared with magnetic property changes on annealing. The obtained results are as follows; [Co-Zr system] (1)Magnetic coercivity decrease(100e to 60e) occurred after annealing at 250ﾟC. Auger spectroscopy showed a formation of diffusional layer with a mixture of Co and Zr. (2)The diffusional layer was found to be thinner than 20 A^^ﾟ and no halo pattern nor amorphous image were observed in electron diffraction and microscopy. (3)The films showed a grain growth of Co and Zr on annealing at temperature higher than 300ﾟC. [Ni-Zr system] (1)Halo diffraction patterns were observed after annealing at temperatures below 350ﾟC.(2)The amorphous structure was found to be composed of microcrystalline grains( 20A^^ﾟ) of Co-Zr alloy. (3)In this system amorphization and crystallization process proceed almost at the same time. In this study, no ideal amorphization process was found to proceed in Cb-Zr and Ni-Zr systems, which is probably due to an inclusion of O, C atoms in metals to inhibit a smooth atomic diffusion.
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