Spin-injection using perpendicularly magnetized thin films

• Project/Area Number: 24760003
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Applied materials science/Crystal engineering
• Research Institution: Tohoku University
• Principal Investigator: KUBOTA Takahide 東北大学, 金属材料研究所, 助教 (00580341)
• Project Period (FY): 2012-04-01 – 2014-03-31
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2012: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
• Keywords: 垂直磁化薄膜 / MnGa / Mn合金 / スピントロニクス / 磁気異方性

Research Abstract

It is desired that a spin-injector material with a high efficiency for developing semiconductor devices with multi-functionality. In this study, Mn-Ga films with high perpendicular magnetic anisotropy were investigated for depositing onto single crystal Si substrate. In addition, spin dependent transport property of the Mn-compounds was investigated, and it is discovered that tunneling spin polarization can be increased by optimizing the interface. A Mn-Ga film with an L1_0 ordered phase was also successfuly fabricated onto single crystalline Si(100) substrate.

Research Products

• [Journal Article] Tunnel magnetoresistance effect using perpendicularly magnetized tetragonal and cubic Mn-Co-Ga Heusler alloy electrode (2014)
  • Author(s): Takahide Kubota, Shigemi Mizukami, Qinli Ma, Hiroshi Naganuma, Mikihiko Oogane, Yasuo Ando, and Terunobu Miyazaki
  • Journal Title: Journal of Applied Physics Volume: Vol. 115
  • Peer Reviewed
• [Journal Article] Tunnel magnetoresistance effect using perpendicularly magnetized tetragonal and cubic Mn-Co-Ga Heusler alloy electrode (2014)
  • Author(s): T. Kubota, S. Mizukami, Q.L. Ma, H. Naganuma, M. Oogane, Y. Ando, T. Miyazaki
  • Journal Title: J. Appl. Phys Volume: 115 Issue: 17
  • DOI: 10.1063/1.4855016
  • Peer Reviewed
• [Journal Article] Magnetic tunnel junctions of perpendicularly magnetized L10 MnGa/Fe/MgO/CoFe structures: Fe-layer-thickness dependences of magnetoresistance effect and tunneling conductance spectra (2013)
  • Author(s): T Kubota, Q. L. Ma, S. Mizukami, X. M. Zhang, H. Naganuma, M. Oogane, Y. Ando, and T. Miyazaki
  • Journal Title: J. Phys. D Volume: 46 Issue: 15 Pages: 155001-155001
  • DOI: 10.1088/0022-3727/46/15/155001
  • Peer Reviewed
• [Journal Article] Interface tailoring effect on magnetic properties and their utilization in MnGa-based perpendicular magnetic tunnel junctions (2013)
  • Author(s): Ma. QL, T. Kubota, S. Mizukami, Zhang. XM, H. Naganuma, M. Oogane, Y. Ando, T. Miyazaki
  • Journal Title: PHYSICAL REVIEW B Volume: 87 Issue: 18
  • DOI: 10.1103/physrevb.87.184426
  • Peer Reviewed
• [Journal Article] Annealing Temperature and Co Layer Thickness Dependence of Magnetoresistance Effect for L10-MnGa/Co/MgO/CoFeB (2012)
  • Author(s): Q. L. Ma, T. Kubota, S. Mizukami, X. M. Zhang, M. Oogane, H. Naganuma, Y. Ando, and T, Miyazaki
  • Journal Title: IEEE Trans. Mag. Volume: 48 Issue: 11 Pages: 2808-2811
  • DOI: 10.1109/tmag.2012.2196420
  • Peer Reviewed
• [Presentation] Tunnel magnetoresistance effect using perpendicularly magnetized tetragonal- and cubic- Mn-Co-Ga Heusler alloy electrode (2013)
  • Author(s): Takahide Kubota, Shigemi Mizukami, Hiroshi Naganuma, Mikihiko Oogane, Yasuo Ando, and Terunobu Miyazaki
  • Organizer: The 58th Annual Magnetism and Magnetic Materials Conference
  • Place of Presentation: アメリカ・デンバー
• [Presentation] ホイスラー型Mn-Co-Gaエピタキシャル薄膜の作製とトンネル磁気抵抗効果 (2013)
  • Author(s): 窪田崇秀, Siham Ouardi,水上成美, Gerhard H. Fecher, Claudia Felser,永沼博,大兼幹彦,安藤康夫,宮﨑照宣
  • Organizer: 第37回日本磁気学会学術講演会
  • Place of Presentation: 札幌
• [Presentation] Magnetic and transport properties of Mn3-xCoGa epitaxially grown tetragoal or cubic Heusler compound thin films (2013)
  • Author(s): Takahide Kubota, Siham Ouardi, Shigemi Mizukami, Gerhard H. Fecher, Claudia Felser, Yasuo Ando, and Terunobu Miyazaki
  • Organizer: 12th Joint MMM-INTERMAG conference
  • Place of Presentation: アメリカ・シカゴ
• [Presentation] 正方晶及び立方晶ホイスラー型(Mn_<3−δ>Co)-Ga薄膜の結晶構造 (2013)
  • Author(s): 窪田崇秀,Ouardi, Siham,水上成美,Fecher, Gerhard H.,Felser, Claudia,安藤康夫,宮﨑照宣
  • Organizer: 第60回応用物理学会春季学術講演会
  • Place of Presentation: 厚木
• [Presentation] Tunnel magnetoresistance effect using perpendicularly magnetized tetragonal- and cubic- Mn-Co-Ga Heusler alloy electrode (2013)
  • Author(s): T. Kubota, S. Mizukami, H. Naganuma, M. Oogane, Y. Ando, and T. Miyazaki
  • Organizer: The 58th Annual Magnetism and Magnetic Materials Conference
  • Place of Presentation: Denver, USA
• [Presentation] Tetragonal or cubic Heusler type Mn-Co-Ga thin films: Magneticproperties and anomalous Hall effect (2013)
  • Author(s): T. Kubota, S. Ouardi, S. Mizukami, C. Felser, Y. Ando, and T. Miyazaki
  • Organizer: Annual Meeting on Advanced Spintronic Materials and Transport Phenomena
  • Place of Presentation: Dresden, Germany
• [Presentation] Magnetoresistance effect of perpendicularly magnetized tunnel junctions using Heusler type Mn-Co-Ga electrode (2013)
  • Author(s): T. Kubota, S. Mizukami, H. Naganuma, M. Oogane, Y. Ando, and T. Miyazaki
  • Organizer: 第74回応用物理学会秋季学術講演会
  • Place of Presentation: 京田辺
• [Presentation] ホイスラー型Mn-Co-Ga エピタキシャル薄膜の作製とトンネル磁気抵抗効果 (2013)
  • Author(s): 窪田崇秀, S. Ouardi, 水上成美, G. H. Fecher, C. Felser, 永沼博, 大兼幹彦, 安藤康夫, 宮﨑照宣
  • Organizer: 第37回日本磁気学会学術講演会
  • Place of Presentation: 札幌
• [Presentation] Magnetic and transport properties of Mn3-xCoGa epitaxially grown tetragoal or cubic Heusler compound thin films (2013)
  • Author(s): T. Kubota, S. Ouardi, S. Mizukami, G. H. Fecher, C. Felser, Y. Ando, and T. Miyazaki
  • Organizer: 12th Joint MMM-INTERMAG conference
  • Place of Presentation: Chicago, USA
• [Presentation] Magnetoresistance effect in MnxGa100-x/FM(FM=Fe, Co, CoFeB)/MgO/CoFeB perpendicular magnetic tunnel junctions with different MnGa composition (2013)
  • Author(s): Q. Ma, T. Kubota, S. Mizukami, X. Zhang, H. Naganuma, M. Oogane, Y. Ando, and T. Miyazaki
  • Organizer: 12th Joint MMM-INTERMAG conference
  • Place of Presentation: Chicago, USA
• [Presentation] 正方晶及び立方晶ホイスラー型(Mn3-δCo)-Ga 薄膜の結晶構造、磁気・伝導特性のCo 組成依存性 (2013)
  • Author(s): 窪田崇秀，Ouardi, Siham，水上 成美，Fecher, Gerhard H.，Felser, Claudia，安藤 康夫，宮﨑 照宣
  • Organizer: 第60回応用物理学会春季学術講演会
  • Place of Presentation: 神奈川
• [Presentation] Dependence of Tunnel Magnetoresistance Effect on Fe Insertion layer thickness of L1_0-MnGa/Fe/MgO/CoFe Junctions (2012)
  • Author(s): Takahie Kubota, Qinli Ma, Shigemi Mizukami, Xianmin Zhang, Hiroshi Naganuma, Mikihiko Oogane, Yasuo Ando, and Terunobu Miyazaki
  • Organizer: The 21th International Colloquium on Magnetic Films and Surfaces
  • Place of Presentation: 中国・上海
• [Presentation] Magnetoresistance Effect of L10-Mn62Ga38/Fe/MgO/CoFe Perpendicularly Magnetized Layer Based Tunnel Junctions (2012)
  • Author(s): T. Kubota, Q. L. Ma, S. Mizukami, X. M. Zhang, H. Naganuma, M. Oogane, Y. Ando, and T. Miyazaki
  • Organizer: The 2nd International Conference of AUMS
  • Place of Presentation: Nara, Japan
• [Presentation] Dependence of Tunnel Magnetoresistance Effect on Fe Insertion layer thickness of L10-MnGa/Fe/MgO/CoFe Junctions (2012)
  • Author(s): T. Kubota, Q. L. Ma, S. Mizukami, X. M. Zhang, H. Naganuma, M. Oogane, Y. Ando, and T. Miyazaki
  • Organizer: The 21th International Colloquium on Magnetic Films and Surfaces
  • Place of Presentation: Shanghai, China