Development of CoPtRh granular media high uniaxial magnetocrystalline anisotropy for heat assisting magnetic recording

• Project/Area Number: 26820109
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Electronic materials/Electric materials
• Research Institution: Tohoku University
• Principal Investigator: HINATA Shintaro 東北大学, 工学研究科, 助教 (20633960)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
• Keywords: 熱アシスト磁気記録 / 一軸結晶磁気異方性 / 積層欠陥 / グラニュラ構造 / CoPtRh / Co基合金薄膜 / 原子層組成変調構造

Outline of Final Research Achievements

A granular medium with columnar structure with huge-uniaxial-magnetogrystalline-anisotropy (Ku) CoPtRh was investigated for future thermally assisted recording system.
As a result of the research, it was found that; 1) To obtain high-Ku CoPtRh based alloy, depositing CoPt based alloy with average valence electron number of 9 or less under substrate temperature of 300 oC. 2) To obtain granular medium with columnar structure, addition of composite material consist of low- and high-melting-point oxides, such as B2O3+TiO2 is effective to form a non-magnetic boundary.

Research Products

• [Journal Article] Variation of effective damping factor for CoPt-based alloy films with various atomic stacking structures (2017)
  • Author(s): Shintaro Hinata and Shin Saito
  • Journal Title: AIP Advances Volume: 7 Issue: 5 Pages: 1-8
  • DOI: 10.1063/1.4978638
  • Peer Reviewed
• [Journal Article] Characterization of CoPt-based granular media with intergranular magnetic interaction by Q-band ferromagnetic resonance (2016)
  • Author(s): Shintaro Hinata, Daiji Hasegawa and Shin Saito
  • Journal Title: IEICE Technical Report Volume: 116 Pages: 1-4
• [Journal Article] Compositional dependence of Cr100-xTix texture-inducing layer underlying (002) textured bcc-Cr alloy seed layer for FePt-C based heat-assisted magnetic recording media (2016)
  • Author(s): Seong-Jae Jeon, Shintaro Hinata and Shin Saito
  • Journal Title: IEICE Technical Report Volume: 116 Pages: 5-9
• [Journal Article] Effect of oxide boundary materials on magnetic properties for CoPt-based granular media (2016)
  • Author(s): Kim Kong Tham. Ryosuke Kushibiki, Shintaro Hinata and Shin Saito
  • Journal Title: IEICE Technical Report Volume: 116 Pages: 11-16
  • NAID: 40020873860
• [Journal Article] Effect of additional elements on compositional modulated atomic layered structure of hexagonal Co80Pt20 alloy films with superlattice diffraction (2016)
  • Author(s): Shintaro Hinata, Akira Yamane and Shin Saito
  • Journal Title: AIP Advances Volume: 6 Issue: 5 Pages: 1-9
  • DOI: 10.1063/1.4944668
  • Peer Reviewed
• [Journal Article] Metal-oxide buffer layer for maintaining topological bumpy surface underlayer of columnar CoPt-SiO2 granular media deposited at high substrate temperature (2015)
  • Author(s): Shin Saito, Naoki Nozawa, Shintaro Hinata, Migaku Takahashi, Kazunari Shibuya, Kazuya Hoshino, and Satoru Awaya
  • Journal Title: Journal of Applied Physics Volume: 116
  • Peer Reviewed / Open Access
• [Journal Article] Evaluation of Atomic Layer Stacking Structure and Curie Temperature of Magnetic Films for Thermally Assisted Recording Media (2014)
  • Author(s): Shin Saito, Shintaro Hinata and Migaku Takahashi
  • Journal Title: IEEE Transactions on Magnetics Volume: 50 Issue: 3 Pages: 1-5
  • DOI: 10.1109/tmag.2013.2285286
  • Peer Reviewed / Open Access
• [Presentation] Deposition Process and Surface Morphology of MgO Underlayer for FePt based HAMR (2017)
  • Author(s): Shintaro Hinata, Shin Saito
  • Organizer: ASTC Spring 2017 Research Review Meeting
  • Place of Presentation: Santa Clara, California, USA
  • Year and Date: 2017-03-15
  • Int'l Joint Research
• [Presentation] Variation of effective damping factor for CoPt-based alloy films with various atomic stacking structures (2016)
  • Author(s): Shintaro Hinata, Shin Saito
  • Organizer: 61st Annual Conference on Magnetism and Magnetic Materials
  • Place of Presentation: New Orleans, Louisiana, USA
  • Year and Date: 2016-10-31
  • Int'l Joint Research
• [Presentation] Curie temperature measurement of FePt film by infrared reflectivity (2016)
  • Author(s): Seong-Jae Jeon, Koichi Akahane, Shintaro Hinata, Shin Saito
  • Organizer: International Conference of the Asian Union of Magnetics Societies
  • Place of Presentation: Tainan, Taiwan
  • Year and Date: 2016-08-01
  • Int'l Joint Research
• [Presentation] Ferromagnetic resonance for CoPt-based granular films with intergranular magnetic interaction (2016)
  • Author(s): Shin Saito, Shintaro Hinata
  • Organizer: International Conference of the Asian Union of Magnetics Societies
  • Place of Presentation: Tainan, Taiwan
  • Year and Date: 2016-08-01
  • Int'l Joint Research
• [Presentation] 粒間相互作用を有するCoPt基グラニュラ媒体のQ-band強磁性共鳴によるキャラクタリゼーション (2016)
  • Author(s): 日向慎太朗・長谷川大二・斉藤 伸
  • Organizer: 磁気記録・情報ストレージ研究会
  • Place of Presentation: 東北大学片平キャンパス, 仙台
• [Presentation] Compositional dependence of Cr100-xTix texture-inducing layer underlying (002) textured bcc-Cr alloy seed layer for FePt-C based heat-assisted magnetic recording media (2016)
  • Author(s): Seong-Jae Jeon, Shintaro Hinata, Saito Shin
  • Organizer: 磁気記録・情報ストレージ研究会
  • Place of Presentation: 東北大学片平キャンパス, 仙台
• [Presentation] CoPt基グラニュラ媒体の磁気特性におよぼす粒界酸化物種の効果 (2016)
  • Author(s): タム キム コング, 櫛引了輔, 日向慎太朗, 斉藤 伸
  • Organizer: 磁気記録・情報ストレージ研究会
  • Place of Presentation: 東北大学片平キャンパス, 仙台
• [Presentation] 六方晶Co80Pt20合金薄膜の原子層組成変調構造に及ぼす添加元素の効果 (I) (2015)
  • Author(s): 日向慎太朗，山根明，斉藤伸
  • Organizer: 日本磁気学会
  • Place of Presentation: 北海道大学 (札幌)
  • Year and Date: 2015-09-11