Development of the half-metal spin switch and its application tothe logic circuit

2009 Fiscal Year Final Research Report

• Project/Area Number: 20681016
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Microdevices/Nanodevices
• Research Institution: Tohoku University
• Principal Investigator: OOGANE Mikihiko Tohoku University, 大学院・工学研究科, 助教 (50396454)
• Project Period (FY): 2008 – 2009
• Keywords: スピンエレクトロニクス / ハーフメタル / ホイスラー合金 / トンネル接合 / ホイスラー合金 / スピン注入磁化反転

Research Abstract

Magnetic tunnel junctions (MTJs) with Co_2MnSi based half-metallic Heusler alloy electrodes and an MgO barrier showed very large tunnel magneto resistance (TMR) ratio of 1275% at low temperature and 350% at room temperature. This TMR ratio is the highest among the MTJs with Heusler alloy electrodes. The large TMR effect is desirable for application to the spin-switch device. In addition, the TMR ratio was successfully controlled by the voltage in the device that two MTJs were connected in series. This result indicates that the fabricated device can be used as the logic circuit.

Research Products

• [Journal Article] Tunnel magnetoresistance effect in double magnetic tunnel junctions using half-metallic Heusler alloy electrodes (2009)
  • Author(s): Yusuke Ohdaira, Mikihiko Oogane,, Yasuo, o
  • Journal Title: JOURNAL OF APPLIED PHYSICS 105 Pages: 07C920-1-2
  • Peer Reviewed
• [Journal Article] Low damping constant for Co2FeAl Heusler alloy films and its correlation with density of states (2009)
  • Author(s): S. Mizukami, D. Watanabe, M. Oogane, Y., o, Y. Miura, M. Shirai,, T. Miyazaki
  • Journal Title: JOURNAL OF APPLIED PHYSICS 105 Pages: 07D306-1-3
  • Peer Reviewed
• [Journal Article] Co2FeMnSiホイスラー合金の磁気緩和定数 (2009)
  • Author(s): 大兼幹彦, 窪田崇秀, 廣瀬直紀, 安藤康夫
  • Journal Title: J. Magn. Soc. Jpn. 33 Pages: 270-273
  • Peer Reviewed
• [Journal Article] Ferrimagnetism in epitaxially grown Mn2VAl Heusler alloy investigated by means of soft x-ray magnetic circular dichroism (2009)
  • Author(s): Takahide Kubota, Kenji Kodama, Tetsuya Nakamura, Yuya Sakuraba, Mikihiko Oogane, Koki Takanashi,, Yasuo, o
  • Journal Title: APPLIED PHYSICS LETTERS 95 Pages: 222503-1-3
  • Peer Reviewed
• [Journal Article] Structure, exchange stiffness, and magnetic anisotropy of Co2MnAlxSi1-x Heusler compounds (2009)
  • Author(s): Takahide Kubota, Jaroslav Hamrle, Yuya Sakuraba, Oksana Gaier, Mikihiko Oogane, Akimasa Sakuma, Burkard Hillebr, s, Koki Takanashi,, Yasuo, o
  • Journal Title: JOURNAL OF APPLIED PHYSICS 106 Pages: 113907-1-4
  • Peer Reviewed
• [Journal Article] The effect of MgO barrier on the structure and magnetic properties of Co2MnSi films on n-Si(100) substrates (2009)
  • Author(s): M.A.I. Nahid, M. Oogane, H. Naganuma,, Y., o
  • Journal Title: JOURNAL OF APPLIED PHYSICS 106 Pages: 103907-1-3
  • Peer Reviewed
• [Journal Article] Tunnel magnetoresistance in epitaxially grown magnetic tunnel junctions using Heusler alloy electrode and MgO barrier (2009)
  • Author(s): S Tsunegi, Y Sakuraba, M Oogane, N D Telling, L R Shelfold, E Arenholz, G van der Laan, R J Hicken, K Takanashi, Y, o
  • Journal Title: J. Phys. D: Appl. Phys. 42 Pages: 195004-1-6
  • Peer Reviewed
• [Journal Article] Study of Structure, Magnetic and Electrical Properties of Co2MnSi Heusler Alloy Thin Films Onto n-Si Substrates (2009)
  • Author(s): M.A.I. Nahid, Mikihiko Oogane, Hiroshi Naganuma,, Yasuo, o
  • Journal Title: IEEE TRANSACTIONS ON MAGNETICS 45 Pages: 4030-4032
  • Peer Reviewed
• [Journal Article] Tunnel magnetoresistance effect in magnetic tunnel junctions using epitaxial Co2FeSi Heusler alloy electrode (2009)
  • Author(s): Mikihiko Oogane, Masatsugu Shinano, Yuya Sakuraba,, Yasuo, o
  • Journal Title: JOURNAL OF APPLIED PHYSICS 105 Pages: 07C903-1-3
  • Peer Reviewed
• [Journal Article] Half-metallicity and Gilbert damping constant in Co_2Fe_xMn_1-x Si Heusler alloys depending on the film composition (2009)
  • Author(s): Takahide Kubota, Sumito Tsunegi, Mikihiko Oogane, Shigemi Mizukami, Terunobu Miyazaki, Hiroshi Naganuma,, Yasuo, o
  • Journal Title: APPLIED PHYSICS LETTERS 94 Pages: 122504-1-3
  • Peer Reviewed
• [Journal Article] Epitaxial Mn2. 5Ga thin films with giant perpendicular magnetic anisotropy for spintronic devices (2009)
  • Author(s): Feng Wu, Shigemi Mizukami, Daisuke Watanabe, Hiroshi Naganuma, Mikihiko Oogane, Yasuo, o,, Terunobu Miyazaki
  • Journal Title: APPLIED PHYSICS LETTERS 94 Pages: 122503-1-3
  • Peer Reviewed
• [Journal Article] Direct Observation of Atomic Ordering and Interface Structure in Co2MnSi/MgO/Co2MnSi Magnetic Tunnel Junctions by High-Angle Annular Dark-Field Scanning Transmission Electron Microscopy (2009)
  • Author(s): Toyoo Miyajima, Mikihiko Oogane, Yasutoshi Kotaka, Takashi Yamazaki, Mineharu Tsukada, Yuji Kataoka, Hiroshi Naganuma,, Yasuo, o
  • Journal Title: Applied Physics Express 2 Pages: 093001-1-3
  • Peer Reviewed
• [Journal Article] Structural and Magnetic Properties of Co2MnSi Heusler Alloy Thin Films on Si (2009)
  • Author(s): Muhammad Ariful Islam Nahid, Mikihiko Oogane, Hiroshi Naganuma,, Yasuo, o
  • Journal Title: Japanese Journal of Applied Physics 48 Pages: 083002-1-3
  • Peer Reviewed
• [Journal Article] Enhancement in tunnel magnetoresistance effect by inserting CoFeB to the tunneling barrier interface in Co2MnSi/MgO/CoFe magnetic tunnel junctions (2009)
  • Author(s): S. Tsunegi, Y. Sakuraba, M. Oogane, Hiroshi Naganuma, K. Takanashi,, Y., o
  • Journal Title: APPLIED PHYSICS LETTERS 94 Pages: 252503-1-3
  • Peer Reviewed
• [Journal Article] Co2MnSiを電極とする微小二重トンネル接合の作製と評価 (2009)
  • Author(s): 大平祐介, 大兼幹彦, 安藤康夫
  • Journal Title: J. Magn. Soc. Jpn. 33 Pages: 262-265
  • Peer Reviewed
• [Journal Article] Evidence of local moment formation in Co-based Heusler alloys (2008)
  • Author(s): N.D. Telling, P.S. Keatley, G. van der Laan, R.J. Hicken, E. Arenholz, Y. Sakuraba, M. Oogane, Y., o, K. Takanashi, A. Sakuma,, T. Miyazaki
  • Journal Title: PHYSICAL REVIEW B 78 Pages: 184438
  • Peer Reviewed
• [Journal Article] Large tunnel magnetoresistance in magnetic tunnel junctions using a Co2MnSi Heusler alloy electrode and a MgO barrier (2008)
  • Author(s): Sumito Tsunegi, Yuya Sakuraba, Mikihiko Oogane, Koki Takanashi,, Yasuo, o
  • Journal Title: APPLIED PHYSICS LETTERS 93 Pages: 112506-1-3
  • Peer Reviewed
• [Journal Article] Influence of the L21 ordering degree on the magnetic properties of Co2MnSi Heusler films (2008)
  • Author(s): O. Gaier, J. Hamrle, S.J. Hermsdoerfer, H. Schultheis, B. Hillebr, s, Y. Sakuraba, M. Oogane,, Y., o
  • Journal Title: JOURNAL OF APPLIED PHYSICS 103 Pages: 103910-1-6
  • Peer Reviewed
• [Journal Article] Temperature dependence of the interface moments in Co2MnSi thin films (2008)
  • Author(s): N.D. Telling, P.S. Keatley, L.R. Shelford, E. Arenholz, G. van der Laan, R.J. Hicken, Y. Sakuraba, S. Tsunegi, M. Oogane, Y., o, K. Takanashi,, T. Miyazaki
  • Journal Title: APPLIED PHYSICS LETTERS 92 Pages: 192503-1-3
  • Peer Reviewed
• [Journal Article] Magnetic second harmonic generation at the Co2MnSi/AlOx interface (2008)
  • Author(s): L.R. Shelford, Y. Liu, R.J. Hicken, Y. Sakuraba, M. Oogane,, Y., o
  • Journal Title: JOURNAL OF APPLIED PHYSICS 103 Pages: 07D720-1-3
  • Peer Reviewed
• [Presentation] Co2FexMn1-xSiおよびCo2MnAlxSi1-xホイスラー合金の磁気緩和定数 (2009)
  • Author(s): 大兼幹彦, 窪田崇秀, 常木澄人, 佐藤丈, 水上成美, 永沼博, 安藤康夫
  • Organizer: 第33回日本磁気学会学術講演会
  • Place of Presentation: 長崎
  • Year and Date: 2009-09-12
• [Presentation] ホイスラー合金電極トンネル接合におけるスピン注入磁化反転 (2009)
  • Author(s): 大兼幹彦, 飛田智史, 常木澄人, 西村真之, 井波暢人, 永沼博, 安藤康夫
  • Organizer: 第70回応用物理学会学術講演会
  • Place of Presentation: 富山
  • Year and Date: 2009-09-08
• [Presentation] Magnetic Damping Constants for Half-metallic Heusler Alloy Thin Films (2009)
  • Author(s): M. Oogane, T. Kubota, S. Tsunegi, J. Sato, H. Naganuma, S. Mizukami, Y., o
  • Organizer: International Workshop and Seminar on Magnonics
  • Place of Presentation: イツ, ドレスデン
  • Year and Date: 2009-08-06
• [Presentation] Magnetic Damping Constants for Half-metallic Heusler Alloy Thin Films (2009)
  • Author(s): M. Oogane, T. kubota, S. Tsunegi, J. Sato, H. Naganuma, S. Mizukami, Y., o
  • Organizer: International Conference on Magnetism, 2009
  • Place of Presentation: ドイツ, カールスルーエ
  • Year and Date: 2009-07-27
• [Presentation] SPIN TRANSFER SWITCHING IN MAGNETIC TUNNEL JUNCTIONS WITH A HALF-METALLIC HEUSLER ALLOY ELECTRODE (2009)
  • Author(s): M. Oogane, S. Hida, S. Tsunegi, H. Naganuma, N. Inami,, Y., o
  • Organizer: 20th International Colloquium on Magnetic Films and Surfaces
  • Place of Presentation: ドイツ, ベルリン
  • Year and Date: 2009-07-22
• [Presentation] Tunnel Magneto-resistance Effect in Magnetic Tunnel Junctions using Half-metallic Heusler Alloy Electrodes and a MgO Tunneling Barrier (2008)
  • Author(s): M. Oogane, S. Tsunegi, T. Kubota, Y. Sakuraba, K. Takanashi, Y., o
  • Organizer: MRS2008
  • Place of Presentation: 米国, ボストン
  • Year and Date: 2008-12-02
• [Presentation] Tunnel magnetoresistance effect in magnetic tunnel junctions with Co-Mn-Si Heusler alloy electrode (2008)
  • Author(s): M. Oogane
  • Organizer: 53rdMMM
  • Place of Presentation: 米国, オースチン
  • Year and Date: 2008-11-12
• [Presentation] ホイスラー合金薄膜の磁気異方性と磁気緩和 (2008)
  • Author(s): 大兼幹彦, 窪田崇秀, 廣瀬直紀, 桜庭裕弥, 高梨弘毅, 安藤康夫
  • Organizer: 第32回日本磁気学会学術講演会
  • Place of Presentation: 仙台
  • Year and Date: 2008-09-14
• [Presentation] フルホイスラー合金の磁気緩和定数測定 (2008)
  • Author(s): 大兼幹彦, 窪田崇秀, 廣瀬直紀, 桜庭裕弥, 高梨弘毅, 安藤康夫
  • Organizer: 第69回応用物理学会学術講演会
  • Place of Presentation: 名古屋
  • Year and Date: 2008-09-02