| Project/Area Number |
11450273
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Material processing/treatments
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
OTSUKI Akira Institute of Advanced Energy, Kyoto Uni., Associate Prof., エネルギー理工学研究所, 助教授 (10026148)
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| Co-Investigator(Kenkyū-buntansha) |
UEDA Shizumasa Institute of Advanced Energy, Kyoto Uni., Research Associate, エネルギー理工学研究所, 助手 (00093196)
ISHIHARA Keiichi n. School of Energy Science, Kyoto.Uni., Associate Prof., エネルギー科学研究科, 助教授 (30184550)
SHINGU P.hideo School of Energy Science, Kyoto.Uni., Professor, エネルギー科学研究科, 教授 (20026024)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥11,200,000 (Direct Cost: ¥11,200,000)
Fiscal Year 2000: ¥4,600,000 (Direct Cost: ¥4,600,000)
Fiscal Year 1999: ¥6,600,000 (Direct Cost: ¥6,600,000)
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| Keywords | metallic multilayer / nanometer-ordered structure / stacking structure / strength / repeated rolling / GMR |
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| Research Abstract |
Multilayers such as Fe/Cr, Co/Cu and Co/Ag have exhibited excellent giant magnetoresistance and have been fabricated by the well-controlled layer by layer deposition techniques. Instead of the layer by layer deposition methods, a totally different approach of sample fabrication, which utilizes the repeated pressing or rolling, has been successfully developed and applied to produce the layered nanometer-ordered structures from metal powders and sheets. By this sample preparation method, it is possible to produce metallic multilayers with the layer thickness in nanometer order in a bulk form. In this work, taking advantage of such bulk dimension of the sample prepared, results of the exploration of the mechanical, magnetoresistive and thermoelectric properties were reported.
Bulk Fe/Ag and Fe/Cu multilayers with layer thickness of 10-20nm have been sucessfully fabricated by repeated press-rolling directed from a macroscopic stack of metal sheets.
The mechanical strength of thin foil starting samples, as measured by tensile tests, was determined for samples of various layer thickness. The yield stress and ultimate strength increased with decreasing layer thickness. The yield stress versus layer thickness showed so called the Hall-Petch relation, the inverse-square-root dependence.
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