磁気記録媒体用コバルト-モリブデンとコバルト-タングステン基合金薄膜のミクロ組織制御

磁记录介质用钴钼和钴钨基合金薄膜的微观结构控制

• 批准号: 04F04511
• 负责人: 及川 勝成
• 金额: $ 0.77万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-04F04511/
• 关键词: 磁気記録媒体; 二相分離; 結晶磁気異方性; Co基合金薄膜; 磁性薄膜; 計算状態図

コンピュータのハードディスク等に用いられるCo-Cr基磁気記録媒体は,急速な高記録密度化に伴う結晶粒径の微細化等のため,熱揺らぎによる記録状態の劣化などが顕在化しつつある.対熱揺らぎ特性の改善には,高い磁気異方性エネルギーを有する磁性薄膜の開発が必要不可欠である.現在,高い磁気異方性を有するFePt-L1_0型合金が注目され,微細な孤立粒子状薄膜を作製するためのプロセスの研究が盛んに行われている.しかし,規則化温度が従来プロセスと比較して高温なことや,磁性粒子の孤立化などで実用化への課題が山積されている.Co-Cr基磁気記録媒体は,Co-richの強磁性hcp構造粒子をCr-richの常磁性hcp構造層が取り囲む2相分離組織となっていることが,優れた磁気記録特性を示す一つの要因であった.この2相分離は,Co-Cr系状態図のCo側の磁気変態点に沿って現れる2相分離に起因していると考えられる.従って,Co-Cr基合金と同様の2相分離組織を示し,高い磁気異方性エネルギーをもつ材料が磁性薄膜材料が次世代磁気記録媒体の候補として適していると考えられる.予備研究の結果より,Co-MoおよびCo-W系がCo-Cr系よりも数倍高い磁気異方性エネルギーを持ち,更に,計算状態図より,これらの系にCo-Cr系と同様の2相分離が存在することが明らかにし,そこで,Co-MoおよびCo-W系を次世代磁気記録媒体の基本系として提案している.更に,Cr, NiAlおよびNiAlV合金を下地層としてCo-W薄膜を作製した結晶配向性および磁気特性について調査した結果,NiAl下地が配向制御だけでなく,磁気特性の改善にも有効であることが明らかとなった.更に,NiAlを下地としてCo-W薄膜の膜厚を変化させた結果,僅か10nmの膜厚でも1kOe以上の高い保磁力をもち磁気記録媒体として有望であることを示した.

This is due to the use of Co-Cr-based magnetic recording media, such as the rapid high-density magnetic recording media, the rapid high-density magnetic recording media, the rapid high-density magnetic recording media, the rapid high-density magnetic recording media, the rapid high-density magnetic recording media, the rapid high-density magnetic recording media, the rapid high-density magnetic recording media and so on. Due to the improvement of magnetic properties, high magnetic properties and high magnetic properties are necessary. At present, the magnetic properties of the high magnetic field have the characteristics of the FePt-L1_ 0 alloy, and the microstructures of the isolated particle-like thin films are used in the study of the high magnetic properties. In this paper, we use the standard temperature to compare the high temperature temperature, the magnetic particles, the isolation, the use, the Co-Cr-based magnetic recording media, the Co-rich strong magnetic hcp particles, the Cr-rich normal magnetic hcp, the high temperature hcp, the high temperature, the magnetic particles, the high temperature, the magnetic particles, the magnetic particles. The magnetic recording properties show that there is a significant difference between the two. The cause of the separation of phase 2, Co-Cr series, Co, magnetic field, along the line of phase separation, has been investigated. In this paper, Co-Cr-based alloys are used in the same phase separation organization, high magnetic properties, magnetic thin film materials, next-generation magnetic recording media, and so on. According to the results of the research, the Co-Mo system is the Co-Cr system, the magnetic system is several times higher, the magnetic properties are higher, the calculation is more accurate, the Co-Cr system is the same as the phase separation system, there are significant differences between the two systems, the Co-Mo system, the Co-W system, the next-generation magnetic recording media system, the first generation magnetic recording system, the second generation magnetic recording media system, the second generation magnetic recording media system, the second generation magnetic recording media system. In addition, Cr, NiAl and NiAlV alloys are used to improve the magnetic properties of the Co-W thin films. The results show that the magnetic properties are in the right direction, and the magnetic properties are improved. More importantly, the results show that the thickness of the Co-W thin film is different from that of the NiAl, the thickness of the 10nm film is higher than that of 1kOe, and the magnetic recording media is expected to show good results.