2013 Fiscal Year Final Research Report
Research on 3 dimensional magnetic recording for high-capacity and low power consuming storage technologies
| Project/Area Number |
23360160
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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 |
Electron device/Electronic equipment
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| Research Institution | Keio University |
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Principal Investigator |
NOZAKI Yukio 慶應義塾大学, 理工学部, 准教授 (30304760)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUYAMA Kimihide 九州大学, 大学院・システム情報科学研究院, 教授 (80165919)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | 磁気記録 / 強磁性共鳴 / 垂直磁化膜 / マイクロ波 |
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| Research Abstract |
A three-dimensional magnetic recording in a multi-layered stacked magnetic pillar was investigated using micromagnetic simulation. Selective magnetization switching is possible with the assistance of a circularly polarized microwave field with an adequate corresponding frequency. The value of the saturation magnetization of the magnetic layers is critical in suppressing selective magnetization switching errors caused by magnetostatic fields. A large saturation magnetization of up to 600 emu/cm3 in the second layer allows successful three-dimensional magnetic recording. Microwave-assisted recording on a 500-Gbpsi-class perpendicular medium was experimentally demonstrated at room temperature. A frequency-dependent reduction in the switching field was clearly observed in response to a microwave impulse 50 ns in duration. A significant reduction of up to 30% in the coercive field was achieved by applying a microwave impulse with an amplitude of 25 dBm and a frequency of 15 GHz.
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