Optical detection of spin current and magnetization relaxation in metallic multilayers

2010 Fiscal Year Final Research Report

• Project Area: Creation and control of spin current
• Project/Area Number: 19048006
• Research Category: Grant-in-Aid for Scientific Research on Priority Areas
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Tohoku University
• Principal Investigator: ANDO Yasuo Tohoku University, 大学院・工学研究科, 教授 (60250726)
• Co-Investigator(Kenkyū-buntansha): OOGANE Mikihiko 東北大学, 大学院・工学研究科, 准教授 (50396454) ; MIZUKAMI Shigemi 東北大学, 原子分子材料科学高等研究機構, 助教 (00339269) ; NAGANUMA Hiroshi 東北大学, 大学院・工学研究科, 助教 (60434023)
• Project Period (FY): 2007 – 2010
• Keywords: スピン流 / スピン注入 / スピン侵入長 / 強磁性共鳴 / トンネル接合 / ダンピング定数 / スピンダイナミクス / 磁気緩和

Research Abstract

We investigated ultrafast demagnetization for epitaxial Heusler films using an all-optical pump-probe technique. Values of demagnetizationτM increased with the laser power P for Mn-Ga alloys and perpendicular magnetized Co-alloys, this is consistent with microscopic theory. On the other hand,τM decreased with P for Co_2MnSi Heusler alloys on Ag and Cr buffer layers.

Research Products

• [Journal Article] Ultrafast Demagnetization for Ni_80Fe_20 and Half-metallic Co_2MnSi Heusler Alloy Films (2010)
  • Author(s): S.Mizukami, S.Tsunegi, T.Kubota, M.Oogane, D.Watanabe, H.Naganuma, Y.Ando, T.Miyazaki
  • Journal Title: Journal of Physics : Conference Series 200 Pages: 042017-1-"042017-4"
  • 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: Appl.Phys.Lett. 96 Pages: 092511-1-"092511-3"
  • Peer Reviewed
• [Journal Article] Structural and Magnetic Properties of Perpendicular Magnetized Mn_<2.5>Ga Epitaxial Films (2010)
  • Author(s): F.Wu, S.Mizukami, D.Watanabe, E.P.Sajitha, H.Naganuma, M.Oogane, Y.Ando, T.Miyazaki
  • Journal Title: IEEE Trans.Magn. 46 Pages: 1863-1865
  • Peer Reviewed
• [Journal Article] Gilbert magnetic damping constant of epitaxially grown Co-based Heusler alloy thin films (2010)
  • Author(s): M.Oogane, T.Kubota, Y.Kota, S.Mizukami, H.Naganuma, A.Sakuma, Y.Ando
  • Journal Title: Appl.Phys.Lett. 96 Pages: 252501-1-"252501-3"
  • Peer Reviewed
• [Journal Article] Tunnel magnetoresistance effect in magnetic tunnel junctions using epitaxial Co_2FeSi Heusler alloy electrode (2009)
  • Author(s): Mikihiko Oogane, Masatsugu Shinano, Yuya Sakuraba, Yasuo Ando
  • Journal Title: J.Appl.Phys. 105 Pages: 07C903-1-"07C903-3"
  • Peer Reviewed
• [Journal Article] Low damping constant for Co_2FeAl Heusler alloy films and its correlation with density of states (2009)
  • Author(s): S.Mizukami, D.Watanabe, M.Oogane, Y.Ando, Y.Miura, M.Shirai, T.Miyazaki
  • Journal Title: J.Appl.Phys. 105 Pages: 07D306-1-"07D306-3"
  • Peer Reviewed
• [Journal Article] Half-metallicity and Gilbert damping constant in Co_2Fe_xMn_1-_xSi Heusler alloys depending on the film composition (2009)
  • Author(s): Takahide Kubota, Sumito Tsunegi, Mikihiko Oogane, Shigemi Mizukami, Terunobu Miyazaki, Hiroshi Naganuma, Yasuo Ando
  • Journal Title: Appl.Phys.Lett. 94 Pages: 122504-1-"122504122504-3"
  • 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): S.Tsunegi, Y.Sakuraba, M.Oogane, H.Naganuma, K.Takanashi, Y.Ando
  • Journal Title: Appl.Phys.Lett. 94 Pages: 252503-1-"252503-3"
  • Peer Reviewed
• [Journal Article] Direct Observation of Atomic Ordering and Interface Structure in Co_2MnSi/MgO/Co_2MnSi Magnetic Tunnel Junctions by High-Angle Annular Dark-Field Scanning Transmission Electron Microscopy (2009)
  • Author(s): T.Miyajima, M.Oogane, Y.Kotaka, T.Yamazaki, M.Tsukada, Y.Kataoka, H.Naganuma, Y.Ando
  • Journal Title: Appl.Phys.Exp. 2 Pages: 093001-1-"093001-3"
  • 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.Shelford, E.Arenholz, G.van der Laan, R.J.Hicken, K.Takanashi, Y.Ando
  • Journal Title: J.Phys.D : Appl.Phys. 42 Pages: 195004-1-"195004-6"
  • Peer Reviewed
• [Journal Article] Study of Structure, Magnetic and Electrical Properties of Co_2MnSi Heusler Alloy Thin Films Onto n-Si Substrates (2009)
  • Author(s): M.A.I.Nahid, Mikihiko Oogane, Hiroshi Naganuma, Yasuo Ando
  • Journal Title: IEEE TRANSACTIONS ON MAGNETICS 45 Pages: 4030-4032
  • Peer Reviewed
• [Journal Article] Structure, exchange stiffness, and magnetic anisotropy of Co_2MnAl_xSi_<1-x> Heusler compounds (2009)
  • Author(s): Takahide Kubota, Jaroslav Hamrle, Yuya Sakuraba, Oksana Gaier, Mikihiko Oogane, Akimasa Sakuma, Burkard Hillebrands, KokiTakanashi, Yasuo Ando
  • Journal Title: J.Appl.Phys. 106 Pages: 113907-1-"113907-4"
  • Peer Reviewed
• [Journal Article] Tunnel Magnetoresistance Effect in Magnetic Tunnel Junctions Using a Co_2MnSi(110) Electrode (2008)
  • Author(s): M.Hattori, Y.Sakuraba, M.Oogane, Y.Ando, T.Miyazaki
  • Journal Title: Applied Physics Express 1 Pages: 021301-1-"021301-3"
  • Peer Reviewed
• [Journal Article] Determination of Penetration Depth of Transverse Spin Current in Ferromagnetic Metals by Spin Pumping (2008)
  • Author(s): T.Taniguchi, S.Yakata, H.Imamura, Y.Ando
  • Journal Title: Appl.Phys.Exp. 1 Pages: 031302-1-"031302-3"
  • Peer Reviewed
• [Journal Article] Large tunnel magnetoresistance in magnetic tunnel junctions using a Co_2MnSi Heusler alloy electrode and a MgO barrier (2008)
  • Author(s): S.Tsunegi, Y.Sakuraba, M.Oogane, K.Takanashi, Y.Ando
  • Journal Title: Appl.Phys.Lett. 93 Pages: 112506-1-"112506-3"
  • Peer Reviewed
• [Journal Article] Penetration Depth of Transverse Spin Current in Ferromagnetic Metals (2008)
  • Author(s): Tomohiro Taniguchi, Satoshi Yakata, Hiroshi Imamura, Yasuo Ando
  • Journal Title: IEEE TRANSACTIONS ON MAGNETICS 44 Pages: 2636-2639
  • Peer Reviewed
• [Presentation] Magnetization Dynamics and Damping in Magnetic Films with Perpendicular Magnetic Anisotropy (2010)
  • Author(s): S.Mizukami, D.Watanabe, F.Wu, T.Kubota, H.Naganuma, M.Oogane, A.Sakuma, Y.Ando, T.Miyazaki
  • Organizer: International Conference of the Asian Union of Magnetics Societies (ICAUMS2010)
  • Place of Presentation: Jeju, Korea
  • Year and Date: 2010-12-07
• [Presentation] Progress of magneto-resistance effect in MTJs with Heusler alloys (2010)
  • Author(s): Y.Ando
  • Organizer: 2nd Meeting of Strategic Japanese-German Joint Research Program "ASPIMATT" : Advanced spintronic materials and transport phenomena
  • Place of Presentation: Sendai
  • Year and Date: 2010-10-19
• [Presentation] New Heusler alloy films with high-magnetic anisotropy for spintronics devices (2010)
  • Author(s): S.Mizukami, F.Wu, D.Watanabe, T.Kubota, X.Zhang, T.Miyazaki, H.Naganuma, M.Oogane, Y.Ando, A.Sakuma
  • Organizer: International Conference of Nanoscale Magnetism (ICNM2010)
  • Place of Presentation: Gebze/Istanbul
  • Year and Date: 2010-09-30
• [Presentation] Temperature Dependence of Magnetic Damping in Heusler Alloy Thin Films (2010)
  • Author(s): M.Oogane, S.Mizukami, Y.Kota, T.Kubota, H.Naganuma, A.Sakuma, Y.Ando
  • Organizer: SSDM2010
  • Place of Presentation: Tokyo
  • Year and Date: 2010-09-24
• [Presentation] Tunnel magnetoresistance effect in magnetic tunnel junctions with very thin insertion layer (2010)
  • Author(s): M.Oogane, S.Tsunegi, E.Ozawa, H.Naganuma, Y.Ando
  • Organizer: International Symposium on Advanced Magnetic Materials and Applications
  • Place of Presentation: Sendai, Japan
  • Year and Date: 2010-07-13
• [Presentation] Gilbert Damping Mechanisms in Half-metallic Heusler Alloys (2010)
  • Author(s): S.Mizukami
  • Organizer: American Physical Society March Meeting 2010(invited)
  • Place of Presentation: Portland OR, USA
  • Year and Date: 2010-03-19
• [Presentation] Spin dynamics for Heusler alloy films (2010)
  • Author(s): S.Mizukami, J.Walowski, T.Kubota, M.Oogane, H.Naganuma, Y.Ando, T.Miyazaki
  • Organizer: 4th International Workshop on Spin Currents & 2nd International Workshop on Spincaloritoronics(invited)
  • Place of Presentation: Sendai Japan
  • Year and Date: 2010-02-10
• [Presentation] Gilbert damping and its mechanism for Co-based full Heusler alloy thin films (2010)
  • Author(s): S.Mizukami, M.Oogane, T.Kubota, S.Tsunegi, H.Naganuma, Y.Ando, T.Miyazaki
  • Organizer: 11th Joint MMM-Intermag conference(invited)
  • Place of Presentation: Washington DC, USA
  • Year and Date: 2010-01-21
• [Presentation] Magnetic damping of half-metallic Heusler alloys (2009)
  • Author(s): M.Oogane, T.Kubota, S.Tsunegi, J.Sato, H.Naganuma, S.Mizukami, Y.Ando
  • Organizer: International Workshop and Seminar on Magnonics : From Fundamentals to Applications 2009(Magnonics)
  • Place of Presentation: Dresden, Germany
  • Year and Date: 2009-08-06
• [Presentation] Ultrafast Demagnetization for Ni_<80>Fe_<20> and Half-metallic Co_2MnSi Heusler Alloy Films (2009)
  • Author(s): S.Mizukami, S.Tsunegi, T.kubota, M.Oogane, D.Watanabe, H.Naganuma, Y.Ando, T.Miyazaki
  • Organizer: International Conference on Magnetism 2009
  • Place of Presentation: Karlsruhe, Germany
  • Year and Date: 2009-07-28
• [Presentation] The effect of modifying Co_2MnSi/MgO interface on TMR effect (2009)
  • Author(s): S.Tsunegi, Y.Sakuraba, M.Oogane, H.Naganuma, N.Inami, K.Takanashi, Y.Ando
  • Organizer: International Conference on Magnetism 2009
  • Place of Presentation: Karlsruhe, Germany
  • Year and Date: 2009-07-27
• [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.Ando
  • Organizer: International Conference on Magnetism 2009
  • Place of Presentation: Karlsruhe, Germany
  • Year and Date: 2009-07-27
• [Presentation] The effect of inserting thin CoFeB layer into Co_2MnSi/MgO interface on TMR effect (2009)
  • Author(s): S.Tsunegi, Y.Sakurabe, M.Oogane, H.Naganuma, N.Inami, K.Takanashi, Y.Ando
  • Organizer: 20th International Colloquium on Magnetic Films and Surfaces
  • Place of Presentation: Berlin, Germany
  • Year and Date: 2009-07-22
• [Presentation] Perspective of High Tunnel Magnetoresistance in Magnetic Tunnel Junctions with Heusler Alloy Electrodes and MgO Barrier (2009)
  • Author(s): Y.Ando, S.Tsunegi, T.Kubota, G.Kim, T.Hiratsuka, Y.Sakuraba, M.Oogane, K.Takanashi, S.Mizukami, T.Miyazaki
  • Organizer: Tohoku-York Research Seminar
  • Place of Presentation: Sendai
  • Year and Date: 2009-01-20
• [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.Ando
  • Organizer: MRS2008
  • Place of Presentation: Boston
  • 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, N.Hirose, Y.Sakuraba, Y. Ando
  • Organizer: 53^<rd> Annual Conference on Magnetism and Magnetic Materials
  • Place of Presentation: Austin
  • Year and Date: 2008-11-10
• [Presentation] Fabrication and characterization of magnetic tunnel junctions using Co_2MnSi electrode and MgO tunneling barrier (2008)
  • Author(s): S.Tsunegi, Y.Sakuraba, M.Oogane, K.Takanashi, Y.Ando
  • Organizer: Intermag Conference
  • Place of Presentation: Madrid
  • Year and Date: 2008-05-04
• [Book] スピンポンピングと磁化ダイナミクス(スピントロニクスの基礎と材料・応用技術の最前線,第5章(分担執筆)) (2009)
  • Author(s): 安藤康夫
  • Total Pages: 60-74
  • Publisher: シーエムシー出版
• [Remarks] ホームページ等
  • URL: http://www.apph.tohoku.ac.jp/spin/
• [Patent(Industrial Property Rights)] ホイスラー合金電極磁気抵抗素子 (2011)
  • Inventor(s): 大兼幹彦, 永沼博, 安藤康夫, 佐藤丈
  • Industrial Property Rights Holder: 大兼幹彦, 永沼博, 安藤康夫, 佐藤丈
  • Industrial Property Number: 特許,特願2011-051678
  • Filing Date: 2011-03-09