| Project/Area Number |
15K06508
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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 |
Material processing/Microstructural control engineering
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| Research Institution | Nagasaki University |
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Principal Investigator |
OHGAI Takeshi 長崎大学, 工学研究科, 准教授 (60253481)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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| Keywords | 陽極酸化 / 電析 / ナノチャンネル / ナノワイヤー / コバルト / 結晶配向性 / 保磁力 / 角型比 / 磁気特性 / 角形比 |
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| Outline of Final Research Achievements |
Ferromagnetic nanocomposite thick films, which contained (002) textured hcp-Co nanowire arrays, were synthesized by potentio-static electrochemical reduction of Co2+ ions in anodized aluminum oxide (AAO) nanochannel films. The aspect ratio of hcp-Co nanowires with diameter in ca. 25 nm reached up to ca. 1,800. Texture coefficient, TC002 increased with decreasing the overpotential for hcp-Co electrodeposition by shifting the cathode potential nobler than the transition potential, Etra (ca. -0.77 V vs. Ag/AgCl). In a similar way, TC002 increased sharply with decreasing the growth rate of hcp-Co nanowires smaller than the transition growth rate, Rtra (ca. 600 nm s-1). Perpendicular magnetization performance was observed in AAO nanocomposite films containing hcp-Co nanowire arrays. With increasing TC002, coercivity of the nanocomposite film increased and reached up to 1.66 kOe with the squareness of ca. 0.9 at room temperature.
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