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1999 Fiscal Year Final Research Report Summary

Nanoscale Magnetism and Transport

Research Project

Project/Area Number 09236101
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
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) MAEKAWA Sadamichi  Tohoku University, Institute for Material Research, Professor, 金属材料研究所, 教授 (60005973)
TAKANASHI Koki  Tohoku University, Institute for Material Research, Assistant Professor, 金属材料研究所, 助教授 (00187981)
SATO Hideyuki  Tokyo Metropolitan University, Faculty of Science, Professor, 理学部, 教授 (80106608)
OOTUKA Youichi  University of Tsukuba, Institute of Physics, Professor, 物理学系, 教授 (50126009)
YAMAMOTO Ryouichi  The University of Tokyo, Institute of Industrial Science, Professor, 生産技術研究所, 教授 (10107550)
Project Period (FY) 1997 – 1999
KeywordsTunnel magnetoresistance effect / MRAM / Magnetic read head / Surfactant / Single electron tunneling / Spin accumulation / Magnetic wire / Magnetic single electron transistor
Research Abstract

The investigation of the stacking structure and the fabrication process of tunnel junctions were carried out. The tunnel magnetoresistance (TMR) ratio and the resistance obtained were 49%, 3 kΩμmィイD12ィエD1 and 30%, 300ΩμmィイD12ィエD1. These results contribute to the application of TMR effect on magnetic random access memories (MRAM) and magnetic reading heads. Also, the analysis method of TMR junctions by local transport properties using conductive atomic force microscope (AFM) was established. (Miyazaki)
In order to investigate the local magnetization of magnetic wires microfabricated, the simultaneous measurement of a resistance and a transverse voltage at several points was found to be effective. Most of anomalous behaviors reported were explained by anisotropic magnetoresistance with the continuous or discontinuous rotation of local magnetizations. Also, anomalous temperature dependence of a resistance for a bulk ferromagnet was found. (Sato)
The Coulomb staircase caused by single electr … More on tunneling was observed for metal-nonmetal granular thin films. using by scanning tunneling microscope (STM) at room temperature. And also, the negative resistance which was. observed at the same period of the Coulomb staircase was found. This was suggested to be occurred by the spin accumulation effect. (Takanashi)
In ferromagnet/superconductor/ferromagnet double junctions, spins were accumulated into the superconductor at the magnetizations of both ferromagnets aligned antiparallel, so that the super-conducting state was found to be controlled by applying voltages. This must be the new concept of the interaction between magnetism and superconducting effect. (Maekawa)
The sharp interface of Fe/Cr was fabricated successfully by controlling the atomic order growth using Pb surfactant. The giant magnetoresistance (GMR) of Fe/Cr metallic multilayers with Pb surfactant was two times larger than that without Pb surfactant. This result showed experimentally that the interface structure was an important factor for the magnitude of GMR ratio and that the spin dependent scattering at the interface was a main origin of GMR (Yamamoto)
In order to obtain the spin polarization of ferromagnets, magneto Coulomb oscillation phenomenon of a ferromagnetic single electron transistor (SET) was used. The polarity of spin polarization of Ni obtained for Al/Ni/Al-SET was negative, which corresponded to the result form band calculations. However, the absolute value was too small. Less

  • Research Products

    (30 results)

All Other

All Publications (30 results)

  • [Publications] Y.Fukumoto: "Enhancement of Tunnel Magnetoresistance Effect on Junction with Co Cluster Layers in Coulomb Blockade Regime"Jpn. J.Appl. Phys. 38. L932-L934 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Sato: "Local magnetization rotation in NiFe wire monitored by multiple transverse probes"Phys. Rev. B. 61・5. 3227-3230 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Mitani: "Tunnel -MR and Spin Electronics in Metal-Nonmetal Granular Systems"J.Magn.Magn. Mater. 198-199. 179-184 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Takahashi: "Spin Imb arance and Magnetoresistaince in Ferromagnet/Superconductor/Ferromagnet Double Tunnel Junctions"Phys. Rev. Lett. 82・19. 3911-3914 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Kamiko: "The Effect of Pb on the interface Structure of Co/Ni and Metallic Multilayers"J. Magn. Magn. Mater. 198-199. 716-718 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Ootuka: "Magneto-Coulomb Oscillations in Ferromagnetic Single Electron Transistors"Mictoelectronic Engineering. 47. 409-411 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y. Ando, H. Kameda, H. Kubota and T. Miyazaki: "Local Transport Property on Ferromagnetic Tunnel Junction measured using Conductiong Atomic Force microscope"Jpn. J. Appl. Phys.. 38. L737 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Fukumoto, H. Kubota, Y. Ando and T. Miyazaki: "Enhancement of Tunnel Magnetoresistance Effect on Junction with Co Cluster Layers in Coulomb Blockade Regime"Jpn. J. Appl. Phys.. 38. L932 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J. Murai, Y. Ando and T. Miyazaki: "Analysis of the Interlayer in Al/AlィイD22ィエD2OィイD23ィエD2/Co/Al Junctions by Inelastic-Electron-Tunneling Spectroscopy"J. Magn. Soc. Jpn.. 23. 64 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Kubota, T. Watabe, Y. Fukumoto and T. Miyazaki: "Magnetoresistance of Single and Double Junctions Formed by Direct Sputtering using AlィイD22ィエD2OィイD23ィエD2 Target"J. Magn. Soc. Jpn.. 23. 67 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J. Murai, Y. Ando, M. Kamijo, H. Kubota and T. Miyazaki: "Direct Observation of Magnon Excitation in a Ferromagnetic Tunnel Junction Using Inelastic-Electron-Tunneling Spectroscopy"Jpn. J. Appl. Phys.. 38. L1106 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Kubota, S. Otsuka, M. Kamijo, C.C.Yu, N. Tezuka, Y. Ando and T. Miyazaki: "The Dependence of TMR on Plasma Oxidation Time and Al Thickness in Ni-Fe/Co/Al-O/Co Junctions"J. Magn. Soc. Jpn.. 24, (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] X.F. Han, J. Murai, N. Tezuka, H. Kubota, Y. Ando and T. Miyazaki: "Characterization of the Barrier Layer in AlィイD21-xィエD2CoィイD2xィエD2/(AlィイD21-xィエD2CoィイD2xィエD2-oxide)/Al Junctions"J. Magn. Soc. Jpn.. 24, (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Sato, Y. Kobayashi, K. Hashimoto, Y. Aoki, H. Sugawara, S. Mitani, H. Fujimori and S. Ohnuma: "Thermoelectric Power and Hall Effect in Co-Al-O Granular films"J. Magn. Soc. Jpn.. 23. 73 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. K. Aoki, H. Sato, Y. Kobayashi, H. Sugawara, Y. Aoki, T. Ono, K. Shigeto and T. Shinjo: "Transport properties of multilayers with nanoscale structures"J. Magn. Soc. Jpn.. 198-199. 213 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Sato, R. Hanada, H. Sugawara, Y. Aoki, T. Ono, H. Miyajima and T. Shinjo: "Local magnetization rotation in NiFe wire monitored by multiple transverse probes"Phys. Rev. B. 61, (in press). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J. Chiba, S. Mitani, K. Takanashi and H. Fujimori: "STM Observation of Metal-Nonmetal Granular Thin Films"J. Magn. Soc. Jpn.. 23. 82 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Mitani, H. Fujimori, K. Takanashi, K. Yakushiji, J.-G. Ha, S. Takahashi, S. Maekawa, S. Ohnuma, N. Kobayashi, T. Masumoto, M. Ohnuma and K. Hono: "Tunnel -MR and Spin Electronics in Metal-Nonmetal Granular Systems"J. Magn. Soc. Jpn.. 198-199. 179 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J.-G. Ha, S. Mitani, K. Takanashi, M. OHnuma, K. Hono and H. Fujimori: "Annealing Effect of Tunnel-Type GMR in Co-Al-O Granular Thin Films"J. Magn. Soc. Jpn.. 198-199. 21 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Fujimori, S. Mitani and K. Takanashi: "Giant magnetoresistance in insulating granular films and planar tunneling junctions"Mater. Sci. Eng.. A267. 184 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Imamura, J. Chiba, S. Mitani, K. Takanashi, S. Maekawa and H. Fujimori: "Coulomb staircase in STM current through granular films"Phys. Rev. B. 61. 46 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Takahashi and S. Maekawa: "Enhancement in Spin-dependent Tunneling with Coulomb Blockade"J. Magn. Magn. Mater.. 198. 143 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Takahashi H. Imamura and S. Maekawa: "Spin-Imbalance and Magnetoresistance in Ferromagnet/Superconductor/Ferromagnet Double Tunnel Junctions"Phys. Rev. Lett.. 82. 3911 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Imamura, J. Chiba, S. Mitani, K. Takanashi, S. Takahashi, S. Maekawa and H. Fujimori: "Effect of Coulomb Blockade on STM current through Granular Films"Phys. Rev. B. 61. 46 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Imamura, N. Kobayashi S. Takahashi and S. Maekawa: "Conductance Quantization and Magnetoresistance in Magnetic Point Contact"Phys. Rev. Lett.. 84. 1003 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. Kamiko, R. Furukawa, K.-Y. Kim, M. Iwanami and R. Yamamoto: "The Effect of Pb on the interface Structure of Co/Ni and Co/Cu Metallic Multilayers"J. Magn. Magn. Mater.. 198-199. 716 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Yang, T. Matsumoto, H. Yamane, M. Kamiko and R. Yamamoto: "Perpendicular Magnetic Anisotropy and Magneto-optical Properties of (Co-Tb)/Pd Multilayers"J. Magn. Magn. Mater.. 198-199. 357 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.-Y. Kim, R. Furukawa, M. Kamiko and R. Yamamoto: "The Effect of Pb on the interface Structure of Co/Ni and Co/Cu Multilayers"J. Korean Phys. Soc.. 35. S575-S577 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Ootuka, Keiji Ono, Ryoji Matsuda and Hiroshi Shimada: "Magneto-Coulomb Oscillations in Ferromagnetic Single Electron Transistors"Microelectronic Engineering. 47. 409 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Ootuka, R. Matsuda, K. Ono and H. Shimada: "Spin polarization and magneto-Coulomb oscillations in ferromagnetic single-electron transistors"Physica B. (in press). (2000)

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      「研究成果報告書概要(欧文)」より

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Published: 2001-10-23  

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