Fabrication of half-metallic thin films with large magnetic anisotropy andrealization of room-temperature high spin-polarization

• Project/Area Number: 20760005
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Applied materials science/Crystal engineering
• Research Institution: Tohoku University
• Principal Investigator: SAKURABA Yuya Tohoku University, 金属材料研究所, 助教 (10451618)
• Project Period (FY): 2008 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2009: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2008: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
• Keywords: スピントロニクス / ハーフメタル / 垂直磁気異方性 / 強磁性トンネル接合 / TMR効果

Research Abstract

It is necessary to develop the ferromagnetic material with high spin-polarization and large magnetic anisotropy in order to improve a performance of spintronics devices. In this project, a large magnetic anisotropy was successfully applied to half-metallic Co_2MnSi from L1_0-orderd alloys FePt or CoPt in the L1_0-ordered alloy/thin Co_2MnSi stacking structure. Clear tunneling magnetoresistance was observed in the magnetic tunnel junctions with these electrodes.

Research Products

• [Journal Article] Interlayer exchange coupling in Full Heusler Co2FeSi/Cr/Co2FeSi epitaxial trilayer structures (2010)
  • Author(s): S. Bosu, Y. Sakuraba, K. Saito, H. Wang, K. Takanashi
  • Journal Title: IEEE Transactions on magnetics (掲載決定)
  • Peer Reviewed
• [Journal Article] Evidence of Fermi level control in a half-metallic Heusler compound Co2MnSi by Al-doping: Comparison of measurements with first-principles calculations (2010)
  • Author(s): Y. Sakuraba, Y. Kota, T. Kubota, M. Oogane, A. Sakuma. Y. Ando, K. Takanashi
  • Journal Title: Physical Review B 81 Pages: 144422-144422
  • Peer Reviewed
• [Journal Article] Co-concentration dependence of half-metallic properties in Co-Mn-Si epitaxial films (2010)
  • Author(s): Y. Sakuraba, N. Hirose, M. Oogane, T. Nakamura, Y. Ando, K. Takanashi
  • Journal Title: Applied Physics Letters 96 Pages: 92511-92511
  • Peer Reviewed
• [Journal Article] Fabrication of perpendiculary magnetized magnetic tunnel junctions with L10-CoPt/Co2MnSi hybrid electrode (2010)
  • Author(s): T. Hiratsuka, G. Kim, Y. Sakuraba, T. Kubota, K. Kodama, N. Inami, H. Naganuma, M. Oogane, T. Nakamura, K. Takanashi, Y. Ando
  • Journal Title: Journal of Applied Physics 107
  • Peer Reviewed
• [Journal Article] Chemical ordering dependence of interlayer exchange coupling in Co-Mn-Si/Cr/Co-Mn-Si trilayer structures (2010)
  • Author(s): S. Bosu, Y. Sakuraba, K. Saito, H. Wang, S. Mitani, K. Takanashi
  • Journal Title: Physical Review B 81 Pages: 54426-54426
  • Peer Reviewed
• [Journal Article] Co-concentration dependence of half-metallic properties in Co-Mn-Si epitaxial films (2010)
  • Author(s): 桜庭裕弥
  • Journal Title: Applied Physics Letter 96
  • Peer Reviewed
• [Journal Article] Chemical ordering dependence of interlayer exchange coupling in Co-Mn-Si/Cr/Co-Mn-Si trilayer structures (2010)
  • Author(s): ボス・スボロジャティ
  • Journal Title: Physical Review B 81
  • Peer Reviewed
• [Journal Article] Fabrication of perpendiculary magnetized magnetic tunnel junctions with L1_0-CoPt/Co_2MnSi hybrid electrode (2010)
  • Author(s): 平塚喬士
  • Journal Title: Journal of Applied Physics (印刷中)
  • Peer Reviewed
• [Journal Article] Enhancement of spin-asymmetery by L21-ordering in Co2MnSi/Cr/Co2MnSi current-perpendicular-to-plane magnetoresistance devices (2009)
  • Author(s): Y. Sakuraba, T. Iwase, K. Saito, S. Mitani, K. Takanashi
  • Journal Title: Applied Physics Letters 94 Pages: 12511-12511
  • Peer Reviewed
• [Journal Article] Interlayer thickness dependence of 90 degree exchange coupling in Co2MnAl/Cr/ Co2MnAl epitaxial trilayer structures. (2009)
  • Author(s): S. Bosu, Y. Sakuraba, K. Saito, H. Wang, S. Mitani, K. Takanashi
  • Journal Title: Journal of Applied Physics 105
  • Peer Reviewed
• [Journal Article] Enhancement in tunnel magnetoresistance effect by inserting CoFeB to the tunneling barrier interface in Co_2MnSi/MgO/CoFe magnetic tunnel junctions (2009)
  • Author(s): 常木澄人
  • Journal Title: Applied Physics Letter 94
  • Peer Reviewed
• [Journal Article] Enhancement of spin-asymmetery by L21-ordering in Co_2MnSi/Cr/Co_2 MnSi current-perpendicular-to-plane magnetoresistance devices (2009)
  • Author(s): 桜庭裕弥
  • Journal Title: Applied Physics Letter 94
  • Peer Reviewed
• [Journal Article] Interlayer thickness dependence of 90 degree exchange coupling in Co_2MnAl/Cr/Co_2MnAl epitaxial trilayer structures. (2009)
  • Author(s): ボス・スボロジャティ
  • Journal Title: Journal of Applied Physics 105
  • Peer Reviewed
• [Journal Article] Development of high-sensitive magnetoresistance devices using half-metallic Heusler alloy Co_2MnSi (2008)
  • Author(s): 桜庭裕弥
  • Journal Title: IEICE Technical Report MR2008 Pages: 32-36
  • NAID: 110007098524
• [Journal Article] Large tunnel magnetoresiStance in magnetic tunnel junctions using a Co_2MnSi Heusler alloy electrode and a MgO barrier (2008)
  • Author(s): 常木澄人
  • Journal Title: Applied Physics Letter 93
  • Peer Reviewed
• [Presentation] L1_0-FePt/Co_2MnSi積層電極を用いた強磁性トンネル接合の作製 (2010)
  • Author(s): 金国天
  • Organizer: 日本応用物理学会
  • Place of Presentation: 神奈川県平塚市
  • Year and Date: 2010-03-17
• [Presentation] Fabrication and characterization of magnetic tunnel junctions with perpendicularly magnetized Co2MnSi half-metal electrode (2010)
  • Author(s): 桜庭裕弥
  • Organizer: Intermag-MMM Joing conference
  • Place of Presentation: ワシントン
  • Year and Date: 2010-01-14
• [Presentation] Fabrication and characterization of magnetic tunnel junctions with perpendicularly magnetized Co_2MnSi half-metal electrode (2010)
  • Author(s): 桜庭裕弥
  • Organizer: Intermag-MMM Joing conference
  • Place of Presentation: ワシントン、アメリカ
  • Year and Date: 2010-01-14
• [Presentation] Quantitative investigation of spin-asymmetry in Co_2MnSi-based CPP-GMR devices (2009)
  • Author(s): 桜庭裕弥
  • Organizer: International Conference on magnetism
  • Place of Presentation: カールスルイエ、ドイツ
  • Year and Date: 2009-07-27
• [Presentation] Giant magneto-resistance in Co2MnSi/NM/Co2MnSi (NM = Cr, Ag) fully-epitaxial CPP-GMR devices (2009)
  • Author(s): 桜庭裕弥
  • Organizer: 20th International Colloquium on Magnetic Films and Surfaces
  • Place of Presentation: ドイツ
  • Year and Date: 2009-07-23
• [Presentation] Giant magneto-resistance in Co_2MnSi/NM/Co_2MnSi(NM=Cr, Ag)fully-epitaxial CPP-GMR devices (2009)
  • Author(s): 桜庭裕弥
  • Organizer: 20th International Colloquium on Magnetic Films and Surfaces
  • Place of Presentation: ベルリン、ドイツ
  • Year and Date: 2009-07-23
• [Presentation] Quantitative investigation of spin-asymmetry in Co2MnSi-based CPP-GMR devices (2009)
  • Author(s): 桜庭裕弥
  • Organizer: International Conference on magnetism
  • Place of Presentation: ドイツ
  • Year and Date: 2009-07-17
• [Presentation] Co2MnSi /NM/ Co2MnSi (NM = Cr, Ag) CPP-GMR素子の磁気伝導特性 (2009)
  • Author(s): 桜庭裕弥
  • Organizer: 第144回日本金属学会
  • Place of Presentation: 東京
  • Year and Date: 2009-03-30
• [Presentation] Co_2MnSi/NM/Co_2MnSi(NM=Cr, Ag)CPP-GMR素子の磁気伝導特性 (2009)
  • Author(s): 桜庭裕弥
  • Organizer: 第144回日本金属学会
  • Place of Presentation: 東京都目黒区
  • Year and Date: 2009-03-30
• [Presentation] Co-Mn-Si/Cr/Co-Mn-Si三層膜における層間交換結合のCo組成依存性 (2008)
  • Author(s): 桜庭裕弥
  • Organizer: 第143回日本金属学会
  • Place of Presentation: 熊本
  • Year and Date: 2008-09-24
• [Presentation] Co-Mn-Si/Cr/Co-Mn-Si三層膜における層間交換結合のCo組成依存性 (2008)
  • Author(s): 桜庭裕弥
  • Organizer: 第143回日本金属学会
  • Place of Presentation: 熊本県熊本市
  • Year and Date: 2008-09-24
• [Presentation] Co_2MnSiエピタキシャル電極を用いたCPP-GMR素子の作製と評価 (2008)
  • Author(s): 桜庭裕弥
  • Organizer: 第143回日本金属学会
  • Place of Presentation: 熊本県熊本市
  • Year and Date: 2008-09-24
• [Presentation] Co2MnSi /NM/ Co2MnSi (NM = Cr, Ag)構造CPP-GMR素子の作製と評価 (2008)
  • Author(s): 桜庭裕弥
  • Organizer: 第32回日本磁気学会
  • Place of Presentation: 宮城
  • Year and Date: 2008-09-13
• [Presentation] Co_2MnSi/NM/Co_2MnSi(NM=Cr, Ag)構造CPP-GMR素子の作製と評価 (2008)
  • Author(s): 桜庭裕弥
  • Organizer: 第32回日本磁気学会
  • Place of Presentation: 宮城県多賀城市
  • Year and Date: 2008-09-13
• [Presentation] Investigation of strong biauqdratic coupling Co_2MnSi based trilayers structures (2008)
  • Author(s): 桜庭裕弥
  • Organizer: International Magnetics Conference
  • Place of Presentation: スペイン, マドリッド
  • Year and Date: 2008-05-06
• [Remarks]
  • URL: http://db.tohoku.ac.jp/whois/detail/b68c2304c7ff144477e3358aa5f02912.html
• [Remarks]
  • URL: http://db.tohoku.ac.jp/whois/detail/b68c2304c7ff144477e3358aa5f02912.html