1999 Fiscal Year Final Research Report Summary
Study of Ultra-High Debnsity Information Storage Materials
| Project/Area Number |
09044186
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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 |
Electronic materials/Electric materials
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| Research Institution | Toyota Technological Institute |
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Principal Investigator |
SUZUKI Takao Toyota Technologicla Institute, Professor, 大学院・工学研究科, 教授 (70005495)
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| Co-Investigator(Kenkyū-buntansha) |
CHEKANOV Albert Toyota Technological Institute, Postdoctoral Fellow, 大学院・工学研究科, ポストドクトラル研究員 (80308999)
ROBERT Sinclair スタンフォード大学, 教授
ROBERT White スタンフォード大学, 教授
LAUHOFF Georg Toyota Technologicla Institute, Postdoctoral Fellow, 大学院・工学研究科, ポストドクトラル研究員 (70308998)
SHIBAA Rachid Toyota Technological Institute, Postdoctoral Fellow, 大学院・工学研究科, ポストドクトラル研究員 (60319374)
SINCLAR robert Stanford University, Professor
WHITE Robert Stanford University, Professor
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| Project Period (FY) |
1997 – 1999
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| Keywords | Magnetic recording / Magneto-optical recording / Adtivation volume / Magnetization instability / CoィイD23ィエD2Pt ordered alloy thin film / FeCo-Pt ordered alloy thin film / High magnetic anisotropy |
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| Research Abstract |
The present project is concerned with materials science of high density data storage, especially magnetic and magneto-optical recordings. The work is jointly collaborated with the group of Stanford University in the USA.
For furuter high density recording the controllability of nanoscale structure in a recording medium is essential. Also, further development of novel materials with high magnetic an isotropy must be made. The present work is forcused on the above issues. The followings may be summarized as the results.
1. An ordered CoィイD23ィエD2Pt alloy thin film is found to exhibit very high magnetic anisotropy 3x10ィイD17ィエD1 erg/cc at room temperature. This finding is the first to be reported.
2. An ordered CoィイD23ィエD2Pt alloy thin film is found to exhibit very high magnetic anisotropy 3 ×10ィイD17ィエD1 erg/cc at room temperature. This finding is the first to be reported.
3. The thermal stability of magnetic recording media CoCrPtTa strongly depends on activation volume. The activation volume is dependent on magnetic field. decreasing with filed and then increases at fields beyond coercivity. This result implies that the dispersion of magnetic anisotropy of grains is predominant.
4. The noise of recording performance of the above media increases with activation on volume.
5. The field dependence of amorphous TbFeCo films which are being used for magneto-optical recording is very much different from that for magnetic recording media. This implies that the thermal relaxation mechanism in amorphous films is governed by a single energy potential value, as compared to the case of magnetic recording media.
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