| Project/Area Number |
25420689
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Physical properties of metals/Metal-base materials
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| Research Institution | Yokohama National University |
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Principal Investigator |
TAKEDA Mahoto 横浜国立大学, 工学(系)研究科(研究院), 准教授 (30188198)
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| Co-Investigator(Renkei-kenkyūsha) |
HIROI Zenji 東大, 物性研究所, 教授 (30192719)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2015: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2014: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2013: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
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| Keywords | ナノ磁性体 / 磁気特性 / 微視的組織 / 磁区構造 / 熱磁気特性 / ナノグラニュラー磁性体 / 析出 / 組織発展 / 直接観察 / 熱磁気曲線 |
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| Outline of Final Research Achievements |
This study has investigated the relationship between microstructural evolution and magnetic properties of magnetic particles formed in Cu-Ni-X alloys.Single crystal Cu-Ni-X alloy samples were prepared and used for high-resolution transmission and photoemission electron microscopy(TEM and PEEM) observations.The first principle electron energy band calculations and micromagnetic simulations based on KKR method and Landau-Lifschitz-Gilbert equation were also implemented.The present TEM and PEEM observations have revealed that Ni-Fe rich tiny particles were distributed randomly in copper matrix in the initial stage of annealing, while the tendency to arrange linear along <100> directions became more clear with further annealing. A ferromagnetic particle with a magnetically single-domain formed anti-parallel spin pair with an adjacent particle. The A-C mode M-T susceptibility measurements suggest that two types of ferromagnetic regions were formed just after the solution-treatment.
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