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Magnetic properties of micro-structured exchange coupled bilayers

Research Project

Project/Area Number 09450229
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Physical properties of metals
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

OTANI Yoshichika  Graduate School of Engineering, Tohoku University, Associate Professor, 大学院・工学研究科, 助教授 (60245610)

Co-Investigator(Kenkyū-buntansha) KITAKAMI Osamu  Research Institute of Scientific Measurement, Tohoku University, Associate Professor, 科学計測研究所, 助教授 (70250834)
SHIMADA Yutaka  Research Institute of Scientific Measurement, Tohoku University, Professor, 科学計測研究所, 教授 (00006157)
FUKAMICHI Kazuaki  Graduate School of Engineering, Tohoku University, Professor, 大学院・工学研究科, 教授 (00005969)
Project Period (FY) 1997 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥11,600,000 (Direct Cost: ¥11,600,000)
Fiscal Year 1999: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1998: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1997: ¥9,500,000 (Direct Cost: ¥9,500,000)
KeywordsExchange coupling / Domain structure / Ferromagnetic dots array / Ferromagnetic wires / Antiferromagnetic domain wall / Magnetoresistance / Antiferromagnet
Research Abstract

The purpose of this study is to fabricate 3 dimensionally micro-structured exchange coupled bilayers, and to clarify a responsible mechanism for the exchange coupling field in relation to formation of the antiferromagnetic domains and walls. Amongst transition metal alloys and oxides, Cr-Al or NiO was chosen as an antiferromagnet and FeィイD220ィエD2NiィイD280ィエD2 permalloy was chosen as a ferromagnet. After the structural analyses on the grain size and crystallographic orientations between the ferromagnetic and antiferromagnetic layers with using X-ray diffractometer, atomic force microscope and electron microscope, submicron sized exchange coupled bilayers were fabricated by means of electron-bean lithography. The magnetic domain structure as well as magneto-transport properties were then carefully examined with magnetic force microscope and 4 terminal methods. For the first time, the magnetization reversal processes occurring in the sub-micron region was obtained by analyzing the anisotropy magnetoresistance and the planar Hall effects. The results were compared with the demagnetization curves calculated by micromagnetic simulation. It was found that the exchange coupling field varies proportional to the inverse of the coupling area. Furthermore the slope of the variation was found to reflect the degree of roughness at the interface which determines the strength of the net exchange coupling due to the random exchange field.
From this experimental study, the exchange coupling field was shown to be controlled by adjusting the coupling area in submicron scale, which determines the antiferromagnetic domain size.

Report

(4 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • 1997 Annual Research Report
  • Research Products

    (28 results)

All Other

All Publications (28 results)

  • [Publications] Y.Otani: "Effect of buffer layer on antiferromagnetic grain size and exchange-coupling field of Cr_<70>Al_<30>/Fe_<19>Ni_<81> bilayers"J.Appl.Phys.. 83-11. 7213-7215 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y.Otani: "Magnetotransport properties of submicron exchange coupled Fe_<19>Ni_<81>/NiO wires"J.Magn.Magn.Mater.. 198-199. 434-436 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y.Otani: "Magnetization reversal processes in submicron Co dots and antidots arrays"J.Magn.Magn.Mater.. 198-199. 483-485 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y.Otani: "Magnetoresistance and Planar Hall effects in submicron exchange-coupled Fe_<19>Ni_<81>/NiO wires"Appl.Phys.Lett.. 74. 4026-4028 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y.Otani: "Magnetoresistivity of micron size(10・0)epitaxial Co wires"IEEE Trans.Magn.. 35. 2862-2864 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y.Otani: "Spape effect on the magnetic anisotropy of an array of epitaxial(10・0)Co dots"IEEE Trans.Magn.. 35. 3472-3474 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Otani: "Effect of buffer layer on antiferromagnetic grain size and exchange-coupling field of CrィイD270ィエD2AlィイD230ィエD2/FeィイD219ィエD2NiィイD281ィエD2 bilayers"J. Appl. Phys.. 83-11. 7213-7215 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Otani: "Magnetotransport properties of submicron exchange coupled FeィイD219ィエD2NiィイD281ィエD2/NiO wires"J. Magn. Magn. Mater.. 198-199. 434-436 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Otani: "Magnetization reversal processes in submicron Co dots and antidots arrays"J. Magn. Magn. Mater.. 198-199. 483-485 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Otani: "Magnetoresistance and Planar Hall effects in submicron exchange-coupled FeィイD219ィエD2NiィイD281ィエD2/NiO wires"Appl. Phys. Lett.. 74. 4026-4028 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Otani: "Magnetoresistivity of micron size (10・0) epitaxial Co wires"IEEE Trans. Magn.. 35. 2862-2864 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y. Otani: "Shape effect on the magnetic anisotropy of an array of epitaxial (10・0) Co dots"IEEE Trans. Magn.. 35. 3472-3474 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Y.Otani: "Effect of buffer layer on antiferromagnetic grain size and exchange-coupling field of Cr_<70>Al_<30>/Fe_<19>Ni_<81> bilayers"J. Appl. Phys.. 83-11. 7213-7215 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y.Otani: "Magnetotransport properties of submicron exchange coupled Fe_<19>Ni_<81>/NiO wires"J. Magn. Magn. Mater.. 198-199. 434-436 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y.Otani: "Magnetization reversal processes in submicron Co dots and antidots arrays"J. Magn. Magn. Mater.. 198-199. 483-485 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y.Otani: "Magnetoresistance and Planar Hall effects in submicron exchange-coupled Fe_<19>Ni_<81>/NiO wires"Appl. Phys. Lett.. 74. 4026-4028 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y.Otani: "Magnetoresistivity of micron size (10・0) epitaxial Co wires"IEEE Trans. Magn.. 35. 2862-2864 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y.Otani: "Shape effect on the magnetic anisotropy of an array of epitaxial (10・0) Co dots"IEEE Trans. Magn.. 35. 3472-3474 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 大谷義近: "Cr_<70>Al_<30>/Fe_<19>Ni_<81>2層膜における交換結合磁場と結晶粒径" 日本応用磁気学会誌. 21・5. 911-914 (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Otani: "Effect of antiferromagnetic grain size on exchange-coupling field of Cr_<70>Al_<30>/Fe_<19>Ni_<81> bilayers" Appl.Phys.Lett.71・9. 1258-1260 (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] 大谷義近: "メゾスコピック磁性体における磁壁と伝導" 固体物理. 33・2. 113-119 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Otani: "Effect of buffer layer on antiferromagnetic grain size and exchange-coupling field of Cr_<70>Al_<30>/Fe_<19>Ni_<81> bilayers" J.Appl.Phys.83・11. 7213-7215 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Otani: "Magnetotransport properties of submicron exchange coupled Fe_<19>Ni_<81>/NiO wires" J.Magn.Magn.Mater.(印刷中). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Otani: "Magnetoresistance and Planar Hall effects in submicron exchange-coupled Fe_<19>Ni_<81>/NiO wires" Appl.Phys.Lett.(印刷中). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 大谷 義近: "Cr_<70>Al_<30>/Fe_<19>Ni_<81>2層膜における交換結合磁場と結晶粒径" 日本応用磁気学会誌. 21-5. 911-914 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Y.Otani: "Effect of antiferromagnetic grain size on exchange-coupling field of Cr_<70>Al_<30>/Fe_<19>Ni_<81> bilayers" Appl.Phys.Lett.71-9. 1258-1260 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 大谷 義近: "メゾスコピック磁性体における磁壁と伝導" 固体物理. 33-2. 113-119 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] Y.Otani: "Effect of buffer layer on antiferromagnetic grain size and exchange-coupling field of Cr_<70>Al_<30>/Fe_<19>Ni_<81> bilayers" J.Magn.Magn.Mat.(印刷中). (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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