2006 Fiscal Year Final Research Report Summary
Magnetic Fine Structure and High Resolution MFM Observation of Ultra High Density Magnetic Recording Media Aiming at Tera-bit/inch^2
| Project/Area Number |
17310065
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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 |
Nanomaterials/Nanobioscience
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| Research Institution | Akita University |
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Principal Investigator |
ISHIO Shunji Akita University, Vice-president, 副学長 (90134006)
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| Co-Investigator(Kenkyū-buntansha) |
SAITO Hitoshi Akita University, Faculty of Engineering and Resource Science, Professor, 工学資源学部, 教授 (00270843)
PEI Wenli Akita University, Venture Business Laboratory, Post-doctoral fellow researcher, ベンチャー・ビジネス・ラボラトリー, 中核的研究機関研究員 (10375230)
YUAN Janfeng Akita University, Venture Business Laboratory, Post-doctoral fellow researcher, ベンチャー・ビジネス・ラボラトリー, 中核的研究機関研究員 (10400524)
WANG Tao Akita University, Venture Business Laboratory, Post-doctoral fellow researcher, ベンチャー・ビジネス・ラボラトリー, 中核的研究機関研究員 (30431612)
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| Project Period (FY) |
2005 – 2006
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| Keywords | Magnetic force microscopy / Magnetic recording media / Medium noise-coercivity overlapping method / Tera-bit recording / L1_0FePt / ion irradiation / nano-hole medium |
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| Research Abstract |
1. Magnetic fine structure and recording medium noise of high density magnetic recording media
(1.1) Correlation analysis between medium noise and magnetic properties analyzed by the medium noise-coercivity overlapping method
Medium noise-coercivity overlapping method was developed by using magnetic force microscopy and was used to study the origin of medium noise of 400〜600 Gbit/inch^2 class perpendicular media. It was made clear that medium noise arises from (1) a spatial fluctuation of magnetization reversal filed in the media, where fluctuation length extends to about 100nm, (2) an insufficient magnetic filed gradient of recording head.
(1.2) Fabrication of FePt nano-dot patterned media and nano-hole media
It was found that coercivity of L1_0FePt reduces by ion irradiation of Nb^+, Ga^+ and Cr^+ ions from 10kOe to almost 0. Then magnetic nano-dot with about 100 square was successfully fabricated by Ga^+ FIB. Co nano-hole medium was also fabricated by anodic oxidation of alumina. Magnet
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ization reversal filed analysis was done for both media. Both media have high potential for ultra high density recording media over 1 terabit/inch^2.
2. Development of magnetic imaging method with atomic 〜 nano spatial resolution
(2.1) Development of magnetic tip with high spatial resolution MFM
Magnetic thin films with high saturation magnetization and high coercivity must be sputtered on to MFM tips to achieve high resolution less than 10 nm. The fabrication process to obtain such high resolution tip for MFM was studied. Firstly, surface of Si tip was oxidized by plasma oxidation, and then FePt was sputtered on the oxidized tip. Finally, by annealing around 900K, high resolution tip was obtained for magnetic force microscope. Spatial resolution was determined by Fourier analysis and was revealed to be 11-15 nm.
(2.2) Introduction of frequency detection method
Frequency detection method was introduced to improve a resolution to MFM system. Frequency detection system did not work well so far due to instability. Less
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Research Products
(22 results)
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[Journal Article] Structural transition from L1_0 phase to A1 phase in FePt films caused by ion irradiation2006
Author(s)
T.Hasegawa, G.Q.Li, W.Pei, H.Saito, S.Ishio, K.Taguchi, K.Yamakawa, N.Honda, K.Ouchi, T.Aoyama, I.Sato
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Journal Title
J. Appl. Phys. Vol.99
Pages: 053505-1-6
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Structural transition from L1_0 phase to Al phase in FePt films caused by ion irradiation.2006
Author(s)
T.Hasegawa, G.Q.Li, W.Pei, H.Saito, S.Ishio, K.Taguchi, K.Yamakawa, N.Honda, K.Ouchi, T.Aoyama, I.Sato
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Journal Title
J.Appl.Phys. Vol.99
Pages: 053505-1-053505-6
Description
「研究成果報告書概要(欧文)」より
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