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Spin injection into high quality small magnetic tunnel junctions

Research Project

Project/Area Number 13305001
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Applied materials science/Crystal engineering
Research InstitutionTohoku University

Principal Investigator

MIYAZAKI Terunobu  Tohoku University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (60101151)

Co-Investigator(Kenkyū-buntansha) SUZUKI Yoshishige  National Institute of Advanced Industrial Science and Technology, Researcher, エレクトロニクス研究部門, 主任研究員 (50344437)
KUBOTA Hitoshi  Tohoku University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (30261605)
ANDO Yasuo  Tohoku University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (60250726)
余 澤中  東北大学, 大学院・工学研究科, 特別研究員
Project Period (FY) 2001 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥55,900,000 (Direct Cost: ¥43,000,000、Indirect Cost: ¥12,900,000)
Fiscal Year 2003: ¥10,010,000 (Direct Cost: ¥7,700,000、Indirect Cost: ¥2,310,000)
Fiscal Year 2002: ¥12,090,000 (Direct Cost: ¥9,300,000、Indirect Cost: ¥2,790,000)
Fiscal Year 2001: ¥33,800,000 (Direct Cost: ¥26,000,000、Indirect Cost: ¥7,800,000)
KeywordsFerromaanetic tunnel junction / Spin injection / nanometer size / Pulse magnetic field / LLG equation / Focused ion beam / Coplanar / Ferromagnetic resonance / 微小トンネル接合 / 収束イオンビーム / 電子ビームリソグラフィー / C-AFM / コプレーナ線路 / ホンププローブ法 / ダンピング定数 / 電子線リソグラフィ / 伝導性AFM
Research Abstract

A process for fabricating small magnetic tunnel junctions (MTJs) by using focused ion beam (FIB)-assisted chemical vapor deposition was investigated. Deposited tungsten was used as an electrode, and deposited carbon or tungsten was used as a mask. MTJs with a junction area of 400 x 400 nm^2 showed a tunnel magneto-resistance (TMR) ratio of about 30 % at room temperature. An apparatus for MR measurement of small MTJs by using conductive AEM was set up. The MR ratio for the junction with 2 x 0.7 μm-2 was 29%.
Ferromagnetic resonance (FMR) spectra were measured for the Cu/Al-oxide/FeNi/Cu multilayers. Both FMR and the electrical detected microwave resonance (EDMR) spectra suggested that the spin was injected into non-magnetic metal layers due to the spin current generated by the spin precession.
For the electrical detection of the magnetization reversal, a homemade probing apparatus. using air-coplanar probes was set up. A pulse generator was used to create current pulses with less than 500 … More ps rise time through the upper electrode of the MTJs. The time to switch the magnetization decreased to 500 ps with increasing the field pulse amplitude up to 100 Oe with no hard axis field. The time to switch the magnetization became short and the reversal became clear with increasing the hard axis field. The transition time estimated using Landau-Lifshitz-Gilbert (LLG) equation of motion of the exact experimental conditions agreeded well with the experimental measurements.
Magnetization precession of NM/FeNi/NM (NM=Cu and Pt) multilayers was measured by time-resolved magneto-optical Kerr effect (MOKE). The MOKE measurement system equipped with a pulse laser, optical delay lines was set up and samples were combined with photoconductive switch for pulse filed generation. Clear oscillation and relaxation of the magnetization of motion in time domain were successfully observed. Gilbert damping constant α for Cu/FeNi/Cu multilayers was independent of the thickness of feNi. While α for Pt/FeNi/Pt multilayers was enhanced as FeNi layer was thinner. These experimental data were well fitted by LLG-calculation with the same α obtained by ferromagnetic resonance. Less

Report

(4 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • Research Products

    (129 results)

All Other

All Publications (129 results)

  • [Publications] Junichirou Murai: "Magnon excitation of CoFe/Al-oxide/CoFe ferromagnetic tunnel junctions"J.Magn.Magn.Mater.. 226-230. 922-923 (2001)

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      2003 Final Research Report Summary
  • [Publications] Yasuo Ando: "Local transport properties of ferromagnetic tunnel junctions"J.Magn.Magn.Mater.. 226-230. 924-925 (2001)

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      2003 Final Research Report Summary
  • [Publications] Shigemi Mizukami: "Ferromagnetic resonance linewidth for NM/80NiFe/NM films (NM=Cu, Ta, Pd and Pt)"J.Magn.Magn.Mater.. 226-230. 1640-1642 (2001)

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      2003 Final Research Report Summary
  • [Publications] 安藤 康夫: "スピンが担うエレクトロニクスの未来"パリテイ. 16・12. 23-29 (2001)

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      2003 Final Research Report Summary
  • [Publications] Masamitsu Hayashi: "Scanning Tunneling Microscopy Observation of the Initial State of Oxidation in Ferromagnetic Tunnel Junctions"Japanese Journal of Applied Physics. 40. L1317-L1319 (2001)

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    • Related Report
      2003 Final Research Report Summary
  • [Publications] Hitoshi Kubota: "Magnetoresistance and Dipole Shift of Ultrasmall Magnetic Tunnel Junctions Characterized by Conducting Atomic Force Microscopy"Japanese Journal of Applied Physics. 41. L180-L182 (2002)

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    • Related Report
      2003 Final Research Report Summary
  • [Publications] Andrew C.C.Yu: "Lorentz transmission electron microscopy and magnetic force microscopy characterization of NiFe/Al-oxide/Co films"Journal of Applied Physics. 91. 780-784 (2002)

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    • Related Report
      2003 Final Research Report Summary
  • [Publications] Shigemi Mizukami: "Magnetic relaxation of normal-metal(NM)/80NiFe/NM films"J.Magn.Magn.Mater.. 239. 42-44 (2002)

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    • Related Report
      2003 Final Research Report Summary
  • [Publications] X.F.Han: "A self-consistent calculation of intrinsic magnetoelectric properties in magnetic tunnel junctions"J.Magn.Magn.Mater.. 239. 167-169 (2002)

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      2003 Final Research Report Summary
  • [Publications] 井浦 聡則: "ラジカル酸化法で作製した高耐熱強磁性トンネル接合"日本応用磁気学会誌. 26. 839-842 (2002)

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      2003 Final Research Report Summary
  • [Publications] Andrew C.C.Yu: "Effect of Ti seed layer on the magnetization reversal process of Co/NiFe/Al-oxide/NiFe junction films"Journal of Applied Physics. 91. 5234-5239 (2002)

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      2003 Final Research Report Summary
  • [Publications] Andrew C.C.Yu: "Microstructural and magnetic characteristics of IrMn exchange-biased tunnel junctions"J.Magn.Magn.Mater.. 240. 130-133 (2002)

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    • Related Report
      2003 Final Research Report Summary
  • [Publications] Yasuo Ando: "Growth mechanism of thin insulating layer in ferromagnetic tunnel _junctions prepared using various oxidation methods"Journal of Physics D. 35. 2415-2421 (2002)

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      2003 Final Research Report Summary
  • [Publications] Shigemi Mizukami: "Effect of spin diffusion on Gilbert damping for a very thin permalloy layer in Cu/permalloy/Cu/Pt films"Physical Review B. 66. 104413-1-104413-9 (2002)

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      2003 Final Research Report Summary
  • [Publications] 宮崎 照宣: "スピンエレクトロニクス技術の発展と固体磁気メモリへの応用"電子情報通信学会誌. 85. 819-825 (2002)

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  • [Publications] 宮崎 照宣: "トンネル磁気抵抗効果とスピンエレクトロニクスの展開"固体物理. 38. 109-124 (2003)

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  • [Publications] 井浦 聡則: "下部磁性層を酸化して作製したトンネル接合の高耐熱特性"日本応用磁気学会誌. 27. 303-306 (2003)

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  • [Publications] 宮崎 照宣: "スピントロニクスの発展とMRAMの研究開発動向"電子技術. 5. 34-39 (2003)

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  • [Publications] Terunobu Miyazaki: "Recent Development of MRAM Technology"Journal of Magnetics. 8. 36-44 (2003)

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      2003 Final Research Report Summary
  • [Publications] Yasuo Ando: "Interface characterization of magnetic tunnel junctions by using tunneling spectroscopy"Journal of Applied Physics. 93. 7023-7025 (2003)

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      2003 Final Research Report Summary
  • [Publications] Hitoshi Kubota: "Hard mask fabrication for magnetic random access memory elements using focused ion beam assisted selective chemical vapor deposition"Journal of Applied Physics. 93. 8370-8372 (2003)

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      2003 Final Research Report Summary
  • [Publications] J.H.Yu: "Magnetic tunnel junctions with high magnetoresistance and small bias voltage dependence using epitaxial NiFe(111) ferromagnetic bottom electrodes"Journal of Applied Physics. 93. 8555-8557 (2003)

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      2003 Final Research Report Summary
  • [Publications] J.H.Yu: "Electron transport properties in magnetic tunnel junctions with epitaxial NiFe (111) ferromagnetic bottom electrodes"Appl.Phys.Lett.. 82. 4735-4737 (2003)

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      2003 Final Research Report Summary
  • [Publications] Hitoshi Kubota: "Size dependence of switching field of magnetic tunnel junctions down to 50 nm scale"Journal of Applied Physics. 93. 8370-8372 (2003)

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      2003 Final Research Report Summary
  • [Publications] 水上 成美: "強磁性体/非磁性体接合におけるスピンポンピング"日本応用磁気学会誌. 27. 934-939 (2003)

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  • [Publications] Tomohiko Niizeki: "Nanofabrication of magnetic tunnel junctions by using side-edge thin film deposition"Science and Technology of Advanced Materials. 4. 347-352 (2003)

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  • [Publications] 宮崎 照宣: "スピンダイナミックス"マテリアルインテグレーション. 16・9. 23-28 (2003)

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  • [Publications] Ji Hyun Lee: "Characterization of thermally annealed tunnel junctions with preoxidized CoFe pinned electrode"Journal of Applied Physics. 94. 7778-7783 (2003)

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  • [Publications] 安藤 康夫: "超高密度磁気メモリ"電子材料. 43・1. 136-141 (2004)

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  • [Publications] 安藤 康夫: "ユニバーサルメモリMRAM"応用物理. 73. 390-393 (2004)

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  • [Publications] 渡邉 大輔: "集束イオンビームを用いた微小強破性トンネル接合の作製"日本応用磁気学会誌. 28. 569-572 (2004)

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  • [Publications] 中田 淳: "Co_2MnAlホイスラー合金を用いた強磁性トンネル接合"日本応用磁気学会誌. 28. 573-576 (2004)

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  • [Publications] Xiu Feng Han: "Switching properties and dynamic domain structures in double barrier magnetic tunnel junctions"Journal of Magnetics and Magnetic Materials. (In press). (2004)

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  • [Publications] Yasuo Ando: "Time-resolved magnetization precession and reversal dynamics investigated using tunneling current and Kerr effect"Journal of Magnetics and Magnetic Materials. (In press). (2004)

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  • [Publications] Yasuo Ando: "Ferromagnetic tunnel junctions with high thermal stability"Journal of Magnetics and Magnetic Materials. (In press). (2004)

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  • [Publications] Tomohiko Niizeki: "Nanofabrication of magnetic tunnel junctions using electron beam lithography"Journal of Magnetics and Magnetic Materials. (In press). (2004)

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  • [Publications] Hitoshi Kubota: "CO+NH_3 plasma etching for magnetic thin films"Journal of Magnetics and Magnetic Materials. (In press). (2004)

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  • [Publications] Mikihiko Oogane: "Tunnel spectra for Al/Al-oxide/Ni_<80>Fe_<20> junctions under the superconducting transition temperature of Al films"Journal of Magnetics and Magnetic Materials. (In press). (2004)

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  • [Publications] Mikihiko Oogane: "Tunnel Conductance in Ni_<80>Fe_<20>/Al-oxide/Al Junctions below the superconducting temperature of Al films"Transactions of Material Research Society. (In press). (2004)

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  • [Publications] Hiroaki Nakamura: "Measurement of magnetization precession for NM/Ni_<80>Fe_<20>/NM (NM=Cu and Pt) using time-resolved Kerr effect"Japanese Journal of Applied Physics. (In press). (2004)

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  • [Publications] Masamitsu Hayashi: "Spin-dependent inelastic electron tunneling spectroscopy of magnetic tunnel junctions"Japanese Journal of Applied Physics. (In press). (2004)

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  • [Publications] J.Murai, Y.Ando, T.Daibou, K.Yaoita, H.F.Han, T.Miyazaki: "Magnon excitation of CoFe/Al-oxide/CoFe ferromagnetic tunnel junctions"J.Magn.Magn.Mater.. 226-230. 922-923 (2001)

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  • [Publications] Y.Ando, M.Hayashi, M.Kamijo, H.Kubota, T.Miyazaki: "Local transport properties of ferromagnetic tunnel junctions"J.Magn.Magn.Mater.. 226-230. 924-925 (2001)

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  • [Publications] S.Mizukami, Y.Ando, T.Miyazaki: "Ferromagnetic resonance linewidth for NM/80NiFe/NM films (NM=Cu, Ta, Pd and Pt)"J.Magn.Magn.Mater.. 226-230. 1640-1642 (2001)

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  • [Publications] Y.Ando: "Future of electronics pioneered by spin"Parity. 16-12. 23-29 (2001)

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  • [Publications] M.Hayashi, Y.Ando, T.Miyazaki: "Scanning Tunneling Microscopy Observation of the Initial State of Oxidation in Ferromagnetic Tunnel Junctions"Jpn.J.Appl.Phys.. 40. L1317-L1319 (2001)

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  • [Publications] H.Kubota, G Reiss, H.Brucki, W.Schepperi, J.Weckker, G.Gieres: "Magnetoresistance and Dipole Shift of Ultrasmall Magnetic Tunnel Junctions Characterized by Conducting Atomic Force Microscopy"Jpn.J.Appl.Phys.. 41. L180-L182 (2002)

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  • [Publications] Andrew C.C.Yu, C.C.H.Lo, A.Petford-Long, D.Jiles, T.Miyazaki: "Lorentz transmission electron microscopy and magnetic force microscopy characterization of NiFe/Al-oxide/Co films"J.Appl.Phys.. 91. 780-784 (2002)

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  • [Publications] S.Mizukami, Y.Ando, T.Miyazaki: "Magnetic relaxation of normal-metal(NM)/80NiFe/NM films"J.Magn.Magn.Mater.. 239. 42-44 (2002)

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  • [Publications] X.F.Han, W.Y Lai, J.-Q.Wang, C.J.O'Connor, T.Miyazaki: "A self-consistent calculation of intrinsic magnetoelectric properties in magnetic tunnel junctions"J.Magn.Magn.Mater.. 239. 167-169 (2002)

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  • [Publications] S.Lura, H.Kubota, Y.Ando, T.Miyazaki: "Enhancement of Thermal Stability in Ferromagnetic Tunnel Junctions Prepared by the Radical Oxidation Method"J.Magn.Soc.Jpn.. 26. 839-842 (2002)

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  • [Publications] Andrew C.C.Yu, A.K.Petford-Long, K.O'Grady, T.Miyazaki: "Effect of Ti seed layer on the magnetization reversal process of Co/NiFe/Al-oxide/NiFe junction films"J.Magn.Magn.Mater.. 91. 5234-5239 (2002)

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  • [Publications] Andrew C.C.Yu, X.F.Han, J.Murai, Y.Ando, T.Miyazaki, K.Hiraga: "Microstructural and magnetic characteristics of IrMn exchange-biased tunnel junctions"J.Appl.Phys.. 240. 130-133 (2002)

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  • [Publications] Y.Ando, M.Hayashi, S.Iura, K.Yaoita, C.C.Yu, H.Kubota, T.Miyazaki: "Growth mechanism of thin insulating layer in ferromagnetic tunnel junctions prepared using various oxidation methods"J.Phys.D. 35. 2415-2421 (2002)

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  • [Publications] S.Mizukami, Y.Ando, T.Miyazaki: "Effect of spin diffusion on Gilbert damping for a very thin Ni_<80>Fe_<20> layer in Cu/Ni_<80>Fe_<20>/Cu/Pt films"Physical Review B. 66. 104131-1-104131-9 (2002)

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  • [Publications] T.Miyazaki: "Development of Spin-electronics Technology and Application for Solid Magnetic Random Access Memory"J.Inst.Elec.Inf.Comm.. 85. 819-825 (2002)

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  • [Publications] T.Miyazaki, Y.Ando, H.Kubota: "Tunnel magnetoresistance and spinelectronics"Solid State Physics. 84. 109-124 (2003)

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  • [Publications] S.Iura, H.Kubota, Y.Ando, T.Miyazaki: "Thermal Stability of Tunnel Junctions with additional oxidation at the surface of the bottom electrode"J.Magn.Soc.Jpn.. 27. 303-306 (2003)

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  • [Publications] T.Miyazaki: "Development of Spin-electronics Technology and Application for Magnetic Random Access Memory"Denshi-gijutsu. 2003-5. 34-39 (2003)

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  • [Publications] T.Miyazaki, Y.Ando, H.Kubota: "Recent Development of MRNM Technology"Journal of Magnetics. 8. 36-44 (2003)

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  • [Publications] Y.Ando, M.Hayashi, M.Oogane, H.Kubota, T.Miyazaki: "Interface characterization of magnetic tunnel junctions by using tunneling spectroscopy"J.Appl.Phys.. 93. 7023-7025 (2003)

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  • [Publications] H.Kubota, M.Hamada, Y Ando, T.Miyazaki: "Hard mask fabrication for magnetic random access memory elements using focused ion beam assisted selective chemical vapor deposition"J.Appl.Phys.. 93. 8370-8372 (2003)

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      2003 Final Research Report Summary
  • [Publications] J.H.Yu, H.Lee, M.Hayashi, H.Kubota, Y.Ando, T.Miyazaki: "Magnetic tunnel junctions with high magnetoresistance and small bias voltage dependence using epitaxial NiFe(111) ferromagnetic bottom electrodes"J.Appl.Phys.. 93. 8555-8557 (2003)

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      2003 Final Research Report Summary
  • [Publications] J.H.Yu, H.M.Lee, Y.Ando, T.Miyazaki: "Electron transport properties in magnetic tunnel junctions with epitaxial NiFe (111) ferromagnetic bottom electrodes"Appl.Phys.Lett.. 82. 4735-4737 (2003)

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      2003 Final Research Report Summary
  • [Publications] H.Kubota, Y.Ando, T.Miyazaki, G.Reiss, H.Bruckl, W.Schepper: "Size dependence of switching field of magnetic tunnel junctions down to 50 nm scale"J.Appl.Phys.. 93. 8370-8372 (2003)

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  • [Publications] S.Mizukami, Y.Ando, T.Miyazaki: "Spin Pumping in Ferromagnetic-Metal/Normal-Metal Junctions"J.Magn.Soc.Jpn.. 27. 934-939 (2003)

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  • [Publications] T.Niizeki, H.Kubota, Y.Ando, T.Miyazaki: "Nanofabrication of magnetic tunnel junctions by using side-edge thin film deposition"Science and Technology of Advanced Materials. 4. 347-352 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Miyazaki, Y Ando, S.Mizukami, H.Nakamura: "Spin Dynamics"Materials Integration. 16. 23-28 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] J.H.Lee, D.H.Im, C.S.Yoon, C.K.Kim, Y.Ando, H.Kubota, T.Miyazaki: "Characterization of thermally annealed tunnel junctions with preoxidized CoFe pinned electrode"J.Appl.Phys.. 94. 7778-7783 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Y.Ando, N.Teduka, Y.Ohno, H.Kurino, H.Kubota, H.Ohno: "High Density Magnetic memory"Denshi-zairyou. 43-1. 136-141 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Y.Ando: "Universal memory MRAM"OYO BUTURI. 73. 390-393 (2004)

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      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] D.Watanabe, H.Kubota, Y.Ando, T.Miyazaki: "Fabrication of Small Magnetic Tunnel Junctions Using a Focused Ion Beam"J.Magn.Soc.Jpn. 28. 569-572 (2004)

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      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] J.Nakata, M.Oogane, H.Kubota, Y Ando, H.Kato, T.Miyazaki: "Ferromagnetic Tunnel Junctions Using Co_2MnAl Heusler Alloy"J.Magn.Soc.Jpn. 28. 573-576 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] X.F.Han, S.F.Zhao, F.F.Li, T.Daibou, H.Kubota, Y.Ando, T.Miyazaki: "Switching properties and dynamic domain structures in double barrier magnetic tunnel junctions"J.Magn.Magn.Mater.. (in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Y.Ando, H.Nakamura, S.Mizukami, H.Kubota, T.Miyazaki: "Time-resolved magnetization precession and reversal dynamics investigated using tunneling current and Kerr effect"J.Magn.Magn.Mater.. (in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Y.Ando, S.Iura, H.Kubota, T.Miyazaki, C.S.Yoon, J.H.Lee, D.H.Im, C.K.Kimf: "Ferromagnetic tunnel junctions with high thermal stability"J.Magn.Magn.Mater.. (in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Niizeki, H.Kubota, Y.Ando, T.Miyazaki: "Nanofabrication of magnetic tunnel junctions by using electron beam lithography"J.Magn.Magn.Mater.. (in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Kubota, Y.Ando, T.Miyazaki: "CO+NH_3 plasma etching for magnetic thin films"J.Magn.Magn.Mater.. (in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Oogane, T.Daibou, H.Kubota, Y.Ando, T.Miyazaki: "Tunnel spectra for Al/Al-oxide/Ni_<80>Fe_<20> junctions under the superconducting transition temperature of Al films"J.Magn.Magn.Mater.. (in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Oogane, T.Daibou, H.Kubota, Y.Ando, T.Miyazaki: "Tunnel Conductance in Ni_<80>Fe_<20>/Al-oxide/Al Junctions below the superconducting temperature of Al films"Trans.Mat.Res.Soc.. (in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Nakamura, Y.Ando, H.Kubota, S.Mizukami, T.MiyazakiA: "Measurement of magnetization precession for NM/Ni_<80>Fe_<20>/NM (NM=Cu and Pt) using time-resolved Kerr effect"Jpn.J.Appl.Phys.. (in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] M.Hayashi, Y.Ando, M.Oogane, H.Kubota, T.Miyazaki: "Spin-dependent inelastic electron tunneling spectroscopy of magnetic tunnel junctions"Jpn.J.Appl.Phys.. (in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Terunobu Miyazaki: "Recent Development of MRAM Technology"Journal of Magnetics. 8. 36-44 (2003)

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      2003 Annual Research Report
  • [Publications] Ji Hyung Yu: "Electron transport properties in magnetic tunnel junctions with epitaxial NiFe (111) terromagnetic bottom electrodes"Applied Physics Letters. 82. 4735-4737 (2003)

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      2003 Annual Research Report
  • [Publications] Hitoshi Kubota: "Size dependence of switching field of magnetic tunnel junctions down to 50 nm scale"Journal of Applied Physic. 94. 2028-2032 (2003)

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      2003 Annual Research Report
  • [Publications] 水上 成美: "強磁性体/非磁性体接合におけるスピンポンピング"日本応用磁気学会誌. 27. 934-939 (2003)

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      2003 Annual Research Report
  • [Publications] 宮崎 照宣: "スピントロニクスの発展とMRAMの研究開発動向"電子技術. 2003-5. 34-39 (2003)

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      2003 Annual Research Report
  • [Publications] 宮崎 照宣: "スピンダイナミックス"マテリアルインテグレーション. 16・9. 1-6 (2003)

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      2003 Annual Research Report
  • [Publications] Tomohiko Niizeki: "Nanofabrication of magnetic tunnel junctions by using side-edge thin film deposition"Science and Technology of Advanced Materials. 4. 347-352 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Ji Hyun Lee: "Characterization of thermally annealed tunnel junctions with preoxidized CoFe pinned electrode"Journal of Applied Physic. 94. 7778-7783 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Xiu Feng Han: "Switching properties and dynamic domain structures in double barrier magnetic tunnel junctions"Journal of Magnetism and Magnetic Materials. (In press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Yasuo Ando: "Time-resolved magnetization precession and reversal dynamics investigated using tunneling current and Kerr effect"Journal of Magnetism and Magnetic Materials. (In press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Yasuo Ando: "Ferromagnetic tunnel junctions with high thermal stability"Journal of Magnetism and Magnetic Materials. (In press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Hitoshi Kubota: "CO+NH_3 plasma etching for magnetic thin films"Journal of Magnetism and Magnetic Materials. (In press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Tomohiko Niizeki: "Nanofabrication of magnetic tunnel junctions using electron beam lithography"Journal of Magnetism and Magnetic Materials. (In press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Mikihiko Oogane: "Tunnel spectra for Al/Al-oxide/Ni_<80>Fe_<20> junctions under the superconducting transition temperature of Al films"Journal of Magnetism and Magnetic Materials. (In press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Mikihiko Oogane: "Tunnel Conductance in Ni_<80>Fe_<20>/Al-oxide/Al Junctions below the superconducting transition temperature of the Al films"Transactions of Material Research Society. (In press). (2004)

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      2003 Annual Research Report
  • [Publications] 安藤 康夫: "超高密度磁気メモリ"電子材料. 43・1. 136-141 (2004)

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      2003 Annual Research Report
  • [Publications] 渡邊 大輔: "集束イオンビームを用いた微小強磁性トンネル接合の作製"日本応用磁気学会誌. (In press). (2004)

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      2003 Annual Research Report
  • [Publications] 中田 淳: "CO_2MnAlホイスラー合金を用いた強磁性トンネル接合"日本応用磁気学会誌. (In press). (2004)

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      2003 Annual Research Report
  • [Publications] Shigemi Mizukami: "Effect of spin diffusion on Gilbert damping for a very thin permalloy layer in Cu/permalloy/Cu/Pt films"Physical Review B. 66. 104413-1-104413-9 (2002)

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      2002 Annual Research Report
  • [Publications] 井浦 聡則: "ラジカル酸化法で作製した高耐熱強磁性トンネル接合"日本応用磁気学会誌. 26. 839-842 (2002)

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      2002 Annual Research Report
  • [Publications] Yasuo Ando: "Growth mechanism of thin insulating layer in ferromagnetic tunnel junctions prepared using various oxidation methods"Journal of Physics D. 35. 2415-2421 (2002)

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      2002 Annual Research Report
  • [Publications] 井浦 聡則: "下部磁性層を酸化して作製したトンネル接合の高耐熱特性"日本応用磁気学会誌. (In press). (2003)

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      2002 Annual Research Report
  • [Publications] Yasuo Ando: "Interface characterization of magnetic tunnel junctions by using tunneling spectroscopy"Journal of Applied Physics. (In press). (2003)

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      2002 Annual Research Report
  • [Publications] Hitoshi Kubota: "Hard mask fabrication for MRAM elements using FIB assisted selective CVD"Journal of Applied Physics. (In press). (2003)

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      2002 Annual Research Report
  • [Publications] 宮崎 照宣: "トンネル磁気抵抗効果とスピンエレクトロニクスの展開"固体物理. 38. 109-124 (2003)

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      2002 Annual Research Report
  • [Publications] Ji Hyung Yu: "Magnetic tunnel junctions with high magnetoresistance and small bias voltage dependence using epitaxial NiFe(111)ferromagnetic bottom electrodes"Journal of Applied Physics. (In press). (2003)

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      2002 Annual Research Report
  • [Publications] Shigemi Mizukami: "The study on Ferromagnetic Resonance Linewidth for NM/80/NiFe/NM (NM=Cu, Ta, Pd and Pt) Films"Jpn. J. Appl. Phys.. 40. 580-585 (2001)

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      2001 Annual Research Report
  • [Publications] Andrew C.C.Yu: "High resolution electron microscopy of Al-oxide barriers in magnetic tunnel junctions"Japanese Journal of Applied Physics. 40. 5058-5060 (2001)

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      2001 Annual Research Report
  • [Publications] Andrew C.C.Yu: "Direct observation of domain structure and magnetization reversal of magnetic thin films using Lorentz transmission electron microscopy"Japanese Journal of Applied Physics. 40. 4891-4895 (2001)

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      2001 Annual Research Report
  • [Publications] Andrew C.C.Yu: "Lorentz transmission electron microscopy and magnetic force microscopy characterization of NiFe/Al-oxide/Co films"Journal of Applied Physics. 91. 780-782 (2002)

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      2001 Annual Research Report
  • [Publications] Andrew C.C.Yu: "Microstructural and magnetic characteristics of IrMn exchange-biased tunnel junction"Journal of Magnetism and Magnetic Materials. (in press).

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      2001 Annual Research Report
  • [Publications] Andrew C.C.Yu: "Effect of Ti seed layer on the magnetization reversal process of Co/NiFe/Al-oxide/NiFe junction films"Journal of Applied Physics. (in press).

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      2001 Annual Research Report
  • [Publications] X.F.Han: "Fabrication and magnetoelectrc properties of high-magnetoresistance tunnel junctions"J. Magn. Soc. Jpn.. 25. 707-710 (2001)

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      2001 Annual Research Report
  • [Publications] 林将光: "強磁性トンネル接合のスピン依存局所伝導特性"日本応用磁気学会誌. 25. 759-762 (2001)

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      2001 Annual Research Report
  • [Publications] 矢尾板和也: "プラズマ酸化法による低抵抗強磁性トンネル接合の作製"日本応用磁気学会誌. 25. 771-774 (2001)

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      2001 Annual Research Report
  • [Publications] 大坊忠臣: "中間層にAlを用いた二重トンネル接合の磁気抵抗効果"日本応用磁気学会誌. 25. 767-770 (2001)

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      2001 Annual Research Report
  • [Publications] T.Siripongsakul: "二重強磁性トンネル接合におけるスピン依存伝導特性"日本応用磁気学会誌. 25. 763-766 (2001)

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      2001 Annual Research Report
  • [Publications] X, F.Han: "A self-consistent calculation and an Anisotropic Wavelength Cutoff Energy of Spin-wave Spectrum in Magnetic Tunnel Junctions"J. Mater. Sci. Technol.. 17. 197-202 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Shigemi Mizukami: "The study on Ferromagnetic Resonance Linewidth for NM/80NiFe/NM (NM=Cu, Ta, Pd, and Pt) Films"Jpn. J. Appl. Phys.. 40. 580-585 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Andrew C.C.Yu: "High resolution electron microscopy of Al-oxide barriers in magnetic tunnel junctions"Japanese Journal of Applied Physics. 40. 5058-5060 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Andrew C.C.Yu: "Direct observation of domain structure and magnetization reversal of magnetic thin films using Lorentz transmission electron microscopy"Japanese Journal of Applied Physics. 40. 4891-4895 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Andrew C.C.Yu: "Lorentz transmission electron microscopy and magnetic force microscopy characterization of NiFe/Al-oxide/Co films"Journal of Applied Physics. 91. 780-782 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] X.F.Han: "Analysis of intricsic magnetoelectric properties in spin-valve-type tunnel junctions with high magnetoresutance and low resistance"Physical Review B. 63. 224404-1-224404-7 (2001)

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      2001 Annual Research Report
  • [Publications] H.Kubota: "Magnetoresistance and Dipole Shift of Ultrasmall Magnetic Tunnel Junctions Characterized by Conducting Atomic Force Microscopy"Jpn. J. Appl. Phys.. 41. L180-L182 (2002)

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      2001 Annual Research Report
  • [Publications] Andrew C.C.Yu: "Microstructural and magnetic characteristics of IrMn exchange-biased tunnel junction"Journal of Magnetism and Magnetic Materials. (in press). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] Andrew C.C.Yu: "Effect of Ti seed layer on the magnetization reversal process of Co/NiFe/Al-oxide/NiFe junction films"Journal of Applied Physics. (in press). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] X.F.Han: "A self-consistent calculation of intrinsic magnetoelectric properties in magnetic tunnel junctions"J. Magn. Magn. Matter.. (in press). (2002)

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      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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