| Project/Area Number |
16560604
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Structural/Functional materials
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| Research Institution | Tohoku-Gakuin University (2005)
Tohoku University (2004) |
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Principal Investigator |
SHIMA Toshiyuki Tohoku-Gakuin University, Faculty of Engineering, Associate professor, 工学部, 助教授 (50261508)
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| Co-Investigator(Kenkyū-buntansha) |
MITANI Seiji Tohoku University, Institute for Materials Research, Associate professor, 金属材料研究所, 助教授 (20250813)
TAKANASHI Koki Tohoku University, Institute for Materials Research, Associate professor, 金属材料研究所, 教授 (00187981)
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| Project Period (FY) |
2004 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2005: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2004: ¥2,700,000 (Direct Cost: ¥2,700,000)
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| Keywords | FePt ordered alloy / sputtering / thin film / Latex spherical-particle / lithography / etching / high coercivity / nucleation-type magnet / ラテックスナノ粒子 / スパッタ薄膜 / ナノスフィアリソグラフィー / ナノ粒子 / 微細加工 / 磁気記録媒体 / 自己集合化 / 規則配列 |
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| Research Abstract |
L1_0-ordered FePt alloy with high magneto-crystalline anisotropy (Ku = 7.0x 10^7 erg/cc) has attracted much attention, since they are believed to be good candidates for future magnetic devises such as next generation ultra high density magnetic storage media and biasing nano-magnets. Therefore, a lot of studies have focused on the fabrication of L1_0 ordered FePt thin films by conventional deposition techniques and nanoparticles by chemical synthesis. However, the magnetization process for highly coercive FePt film has not fully been investigated to date. In this work, a magnetization process of FePt nano-particles were investigated, and a nanosphere lithography technique, utilizing of polystyrene spherical particles, was performed. Comparing to the established hard magnetic materials, ideal nucleation-type magnetization behavior was observed for the "island-like" FePt nanoparticles with multiple magnetic domain structure. In order to cover a mono layer of spherical particles onto the substrate, several techniques, such as dipping, tilting and spin-coating method were attempted. Among these methods, a mono layer of polystyrene nano-particles were successfully covered by using spin-coating method. Several conditions of Ar ion etching were performed for latex covered substrates. It is noted that a specific surface structure, which arises from the shape of the spherical particles, was clearly observed by a high-resolution scanning electron microscope and an atomic force microscope at an appropriate Ar ion etching condition. In order to apply this technique to a patterned media, that is a next generation magnetic recording media, further extended work should be needed.
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