• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

MICROSTRUCTURAL CONTROL OF THE INTERFACE FOR SPIN-VALVE GMR THIN-FILMS BY APPLYING THE ULTRA CLEAN SPUTTERING PROCESS

Research Project

Project/Area Number 09355010
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section展開研究
Research Field 電子デバイス・機器工学
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

TAKAHASHI Migaku  GRADUATE SCHOOL OF ENGINEERING, TOHOKU UNIV., PROFESSOR, 大学院・工学研究科, 教授 (70108471)

Co-Investigator(Kenkyū-buntansha) KIRA Tooru  PRECISION TECHNOLOGY DEVELOPMENT CENTER, SHARP CO., SENIOR RESEARCHER, 生産技術開発本部・精密技術開発センター, 技師長(研究職)
TSUNODA Masakiyo  GRADUATE SCHOOL OF ENGINEERING, TOHOKU UNIV., RESEARCH ASSOCIATE, 大学院・工学研究科, 助手 (80250702)
SHOJI Hiroki  GRADUATE SCHOOL OF ENGINEERING, TOHOKU UNIV., ASSOCIATE PROFESSOR, 大学院・工学研究科, 助教授 (70241528)
Project Period (FY) 1997 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥30,000,000 (Direct Cost: ¥30,000,000)
Fiscal Year 1999: ¥5,800,000 (Direct Cost: ¥5,800,000)
Fiscal Year 1998: ¥7,200,000 (Direct Cost: ¥7,200,000)
Fiscal Year 1997: ¥17,000,000 (Direct Cost: ¥17,000,000)
KeywordsTHIN FILMS / MAGNETIC THINI FILMS / ULTRA HIGH VACUUM / SPUTTERING / 極薄膜
Research Abstract

The extremely clean sputtering process (XC process) was newly introduced in the fabrication of ultra-thin spin valves to control the microstructure and to establish the excellent magnetic properties. The relation between cleanness during film deposition process and the magnetic properties of spin valve elements has been discussed in connection with their microstructure. Sub./Ta/Ni-Fe/Mn-Ni/Ni-Fe and Sub./Ta/Ni-Fe/Mn-Ir/Ta quadrilayers were fabricated under the different purity of the sputtering atmospheres. Strength of the exchange anisotropy measured at room temperature was enhanced in very thin F/AF bilayer fabricated under the XC-process, comparing with the bilayer fabricated under a lower graded (LG-) process, which only differed in the base pressure of the sputtering chamber : 10ィイD1-7ィエD1 Torr order. From a structural analysis and a temperature dependence of the exchange anisotropy of the bilayers, grains in the bilayers fabricated under the XC-process were found to be enlarged a … More nd that the enhancement of exchange anisotropy was caused by the enlargement of antiferromagnetic grains, which suppress thermal agitation and lowering the local blocking temperature. For the electron transport, the enlargement of the grains observed in the XC-processed films also played an important role. The decrease of grain boundaries and impurities in the films, reduced saturated resistivity of the spin valves, Sub. Ta/Ni-Fe/Co/Cu/Co/Mn-Ir/Ta, with lowering the impurity level in the sputtering atmosphere and resulted in the increase of the MR ratios. The MR ratio of tan optimized spin valve fabricated under the XC-process achieved to 9.7%, even in the total thickness of 148 【encircledA】 except for the capping Ta layer, while that of the LG-processed spin valve dropped to 0.9% due to the vanish of the exchange anisotropy. We concluded that the extremely clean sputtering process is greatly effective to realize ultra-thin spin valves and that to avoid rumpling interfaces of them it important to induce the adequate magnetic properties. Less

Report

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

    (56 results)

All Other

All Publications (56 results)

  • [Publications] M.Tsunoda: "Microstructure of antiferromagnetic layer affecting on magnetic exchange coupling in trilayered Ni-Fe/25at%Ni-Mn/Ni-Fe films"Journal of Magnetism & Magnetic Materials. 171. 29-44 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K.Uneyama: "Influence of gas adsorption at the interface on the exchange coupling field of Ni-Fe/25at%Ni-Mn/Ni-Fe films"IEEE Transactions on Magnetics. 33. 3685-3687 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M.Tsunoda: "Effect of surface cleaning of substrate on the exchange coupling field in Ni-Fe/25at%Ni-Mn films"IEEE Transactions on Magnetics. 33. 3688-3690 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 角田匡清: "清浄雰囲気中で作製したNi-Fe/Cu多層スパッタ膜の構造とGMR効果"日本応用磁気学会誌. 22. 545-548 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M.Tsunoda: "Microstructure and giant magnetoresistance of Co-Cu granular films fabricated under the extremely clean sputtering process"Journal of Applied Physics. 83. 7004-7006 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S.Miura: "Influence of impurity gas in the sputtering atmosphere on the microstructure and the GMR in Co/Cu multilayers"IEEE Transactions on Magnetics. 34. 936-938 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M.Tsunoda: "Effect of antiferromagnetic grain size on exchange anisotropy in Ni-Fe/25at%Ni-Mn films"Journal of Magnetic Society Japan. 23. 173-175 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 角田匡清: "極清浄雰囲気中で作製したAg-Co薄膜の構造とGMR効果(Cu-Co薄膜との比較)"日本応用磁気学会誌. 23. 1341-1344 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M.Tsunoda: "Enhanced exchange anisotropy of Ni-Fe/Mn-Ni bilayers fabricated under the extremely clean sputtering process"Journal of Applied Physics. 85. 4919-4921 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M.Konoto: "Orientational dependence of the exchange biasing in Ni-Fe/Mn_<1-X>Ni_X(X=0.11,0.18,0.23)bilayers"Journal of Applied Physics. 85. 4925-4927 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S.Miura: "Drastic change of giant magnetoresistance of Co/Cu multilayers by decreasing residual impurities in sputtering atmosphere"Journal of Applied Physics. 85. 4463-4465 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 高橋研: "極清浄プロセスとスピンバルブGMR薄膜"日本応用磁気学会誌. 23. 1841-1847 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K.Yagami: "Effect of Ir content and sputtering conditions on unidirectional snisotropy of Ni-Fe/Mn-Ir films fabricated under the extremely clean sputtering process"IEEE Transactions on Magnetics. 35. 3919-3921 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M.Takahashi: "Extremely clean sputtering process for spin valves : exchange anisotropy and spin-dependent transport"Journal of Magnetism & Magnetic Materials. 209. 65-70 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T.Tsunoda: "Magnetic anisotropy and rotational hysteresis loss in exchange coupled Ni-Fe/Mn-Ir films"Journal of Applied Physics. (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T.Tsunoda: "Field independent rotational hysteresis loss on exchange coupled polycrystalline Ni-Fe/Mn-Ir bilayers"Journal of Applied Physics. (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M. Tsunoda: "Microstructure of antiferromagnetic layer affecting on magnetic exchange coupling in trilayered Ni-Fe/25 at%Ni-Mn/Ni-Fe films"J. Magn. Magn. Mater.. 171. 29-44 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K, Ueyama: "Influence of gas adsorption at the interface on the exchange coupling field of Ni-Fe/25 at%Ni-Mn/Ni-Fe films"IEEE Trans. Magn.. 33. 3685-3687 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M. Tsunoda: "Effect of surface cleaning of substrate on the exchange coupling field of Ni-Fe/25 at%Ni-Mn films"IEEE Trans. Magn.. 33. 3688-3690 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M. Tsunoda: "Structure and GMR in Ni-Fe/Cu multilayers fabricated by an ultra-clean sputtering process"J. Magn. Soc. Japan. 22. 545-548 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M. Tsunoda: "Microstructure and giant magnetoresistance of Co-Cu granular films fabricated under the extremely clean sputtering process"J. Appl. Phys.. 83. 7004-7006 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S. Miura: "Influence of impurity gas in the sputtering atmosphere on the microstructure and the GMR in Co/Cu multilayers"IEEE Trans. Magn.. 34. 936-938 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M. Tsunoda: "Effect of antiferromagnetic grain size on exchange anisotropy in Ni-Fe/25 at%Ni-Mn films"J. Magn. Soc. Japan. 23. 173-175 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M. Tsunoda: "Microstructure and giant magnetoresistance of Ag-Co films fabricated by means of an extremely clean sputtering process (Compared with Cu-Co films)"J. Magn. Soc. Japan. 23. 1341-1344 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M. Tsunoda: "Enhanced exchange anisotropy of Ni-Fe/Mn-Ni bilayers fabricated under the extremely clean sputtering process"J. Appl. Phys.. 85. 4919-4921 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M. Konoto: "Orientational dependence of the exchange biasing in Ni-Fe/MnィイD21-xィエD2NiィイD2xィエD2 (x=0.11, 0.18, 0.23) bilayers"J. Appl. Phys.. 85. 4925-4927 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] S. Miura: "Drastic change of giant magnetoresistance of Co/Cu multilayers by decreasing residual impurities in sputtering atmosphere"J. Appl. Phys.. 85. 4463-4465 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M. Takahashi: "Extremely clean sputtering process for spin-valve GMR films"J. Magn. Soc. Japan. 23. 1841-1847 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K. Yagami: "Effect of Ir content and sputtering conditions on unidirectional anisotropy of Ni-Fe/Mn-Ir films fabricated under the extremely clean sputtering process"IEEE Trans. Magn.. 35. 3919-3921 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M. Takahashi: "Extremely clean sputtering process for spin valves : exchange anisotropy and spin-dependent transport"J. Magn. Magn. Mater.. 209. 65-70 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M. Tsunoda: "Magnetic anisotropy and rotational hysteresis loss in exchange coupled Ni-Fe/Mn-Ir films"J. Appl. Phys.. in press. (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M. Tsunoda: "Field independent rotational hysteresis loss on exchange coupled polycrystalline Ni-Fe/Mn-Ir bilayers"J. Appl. Phys.. in press. (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] M.Tsunoda: "Microstructure of antiferromagnetic layer affecting on magnetic exchange coupling in trilayered Ni-Fe/25 at % Ni-Mn/Ni-Fe films"Journal of Magnetism & Magnetic Materials. 171. 29-44 (1997)

    • Related Report
      1999 Annual Research Report
  • [Publications] K.Uneyama: "Influence of gas adsorption at the interface on the exchange coupling field of Ni-Fe/25 at % Ni-Mn/Ni-Fe films"IEEE Transactions on Magnetics. 33. 3685-3687 (1997)

    • Related Report
      1999 Annual Research Report
  • [Publications] M.Tsunoda: "Effect of surface cleaning of substrate on the exchange coupling field in Ni-Fe/25 at % Ni-Mn films"IEEE Transactions on Magnetics. 33. 3688-3690 (1997)

    • Related Report
      1999 Annual Research Report
  • [Publications] 角田匡清: "清浄雰囲気中で作製したNi-Fe/Cu多層スパッタ膜の構造とGMR効果"日本応用磁気学会誌. 22. 545-548 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] M.Tsunoda: "Microstructure and giant magnetoresistance of Co-Cu granular films fabricated under the extremely clean sputtering process"Journal of applied Physics. 83. 7004-7006 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] S.Miura: "Influence of impurity gas in the sputtering atmosphere on the microstructure and the GMR in Co/Cu multilayers"IEEE Transactions on Magnetics. 34. 936-938 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] M.Tsunoda: "Effect of antiferromagnetic grain size on exchange anisotropy in Ni-Fe/25 at % Ni-Mn films"Journal of Magnetic Society Japan. 23. 173-175 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 角田匡清: "極清浄雰囲気中で作製したAg-Co薄膜の構造とGMR効果(Cu-Co薄膜との比較)"日本応用磁気学会誌. 23. 1341-1344 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] M.Tsunoda: "Enhanced exchange anisotropy of Ni-Fe/Mn-Ni bilayers fabricated under the extremely clean sputtering process"Journal of Applied Physics. 85. 4919-4921 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] M.Konoto: "Orientational dependence of the exchange biasing in Ni-Fe/Mn_<1-X>Ni_X(x=0.11, 0.18, 0.23) bilayers"Journal of Applied Physics. 85. 4925-4927 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] S.Miura: "Drastic change of giant magnetoresistance of Co/Cu multilayers by decreasing residual impurities in sputtering atmosphere"Journal of Applied Physics. 85. 4463-4465 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 高橋 研: "極清浄プロセスとスピンバルブGMR薄膜"日本応用磁気学会誌. 23. 1841-1847 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] K.Yagami: "Effect of Ir content and sputtering conditions on unidirectional anisotropy of Ni-Fe/Mn-Ir films fabricated under the extremely clean sputtering process"IEEE Transactions on Magnetics. 35. 3919-3921 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] M.Takahashi: "Extremely clean sputtering process for spin valves: exchange anisotropy and spin-dependent transport"Journal of Magnetism & Magnetic Materials. 209. 65-70 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] M.Tsunoda: "Magnetic anisotropy and rotational hysteresis loss in exchange coupled Ni-Fe/Mn-Ir films"Journal of Applied Physics. (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] M.Tsunoda: "Field independent rotational hysteresis loss on exchange coupled polycrystalline Ni-Fe/Mn-Ir bilayers"Journal of Applied Physics. (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] M.Tsunoda: "Microstructure and giant magnetoresistance of Co-Cu granular films fabricated under the extremely clean sputtering process" Journal of Applied Physics. 83. 7004-7006 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] S.Miura: "Influence of Impurity Gas in the Sputtering Atmosphere on the Microstructure and the GMR in Co/Cu Multilayers" IEEE Transactions on Magnetics. 34. 936-938 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] M.Tsunoda: "Enhanced exchange anisotropy of Nife/Mn-Ni bilayers fabricated under the extremely clean sputtering process" Journal of Applied Physics. 印刷中. (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] S.Miura: "Drastic change of giant magnetoresistance of Co/Cu multilayer by decreasing residual imparities in sputtering atmosphere" Journal of Applied Physics. 印刷中. (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 角田匡清: "清浄雰囲気中で作製したNi-Fe/Cu多層スパッタ膜の構造とGMR効果" 日本応用磁気学会誌. 22. 545-548 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 角田匡清: "極清浄雰囲気中で作製したAg-Co薄膜の構造とGMR効果(Co-Cu薄膜との比較)" 日本応用磁気学会誌. 印刷中. (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] M.Tsunoda: "Microsyructure and giant magnetoresistance of Co-Cu granular films fabricated under the extremely clean spatteruy process" Jornal of Applied Physics. 83(印刷中). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] S.Miura: "Infuluence of Impurity Gas in theSputtering Atemaspyere on the Microstructure and the GMR in Co/Cu Multilayers" IEEE Transcation on Magnetics. 34(印刷中). (1998)

    • Related Report
      1997 Annual Research Report

URL: 

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

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi