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Light Rare Earth-Transition Metal Amorphous Films with Huge Perpendicular Magnetic Anisotropy. Magneto-optical Recording Media

Research Project

Project/Area Number 60550221
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 電子材料工学
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

SUZUKI Takao  Faculty of Engineering, Tohoku University, 工学部, 助教授 (70005495)

Co-Investigator(Kenkyū-buntansha) HORIE Chuji  Faculty of Engineering, Tohoku University, 工学部, 教授 (10005168)
KATSURA Shigetoshi  Faculty of Science and Engineering,Tokyo Electrical Engineering College, 工学部, 教授 (40005153)
Project Period (FY) 1985 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1987: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1986: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1985: ¥1,100,000 (Direct Cost: ¥1,100,000)
KeywordsMagneto-optical effect / Vertically magnetized films / Perpendicular magnetic anisotropy / Light rare earths / r.f. sputtering / 磁気-光高密度記録 / スパッター法
Research Abstract

The aim of the present study is to investigate the magnetic and magneto-optical properties of light rare earth-transition metal amorphous films fabricated by r.f. sputtering, and also to obtain information for magneto-optical storage media.
The followings may be summarized as the results;
i) The vertically magnetized films with huge perpendicular magnetic anisotropy of the order of 10^7erg/cc at room temperature have been successfully obtained for (Nd,Pr)_x (Fe,Co)100_<-x> alloys with 10<less than or similar>x<less than or similar>50, when they were deposited onto glass substrates heated at about 150 to 280゜C.
ii) The anisotropy constant K_u at 300K is maximum at x=40 for both Nd and Pr alloys.
iii) The value of K_u increases with decreasing temperature and tends to decrease for temperatures less than about 70K. This result is consistent with those obtained form the magnetization curves in a high field of 150KOe.This can be closely related to the anisotropy dispersion.
iv) The magneto-optical Kerr rotation angle O_k at 800 nm for these amorphous films is about 0.4-0.5゜, which is larger than that for those with heavy rare earths. The O_k increases with decreasing wavelength, which is in contrast to that for heavy rare earths. The addition of Tb with about 10 at% much improves both the magnetic and magneto-optical characteristics.
In view of these results, light rare earth-transition metal amorphous films can be considered as potential candidates for magneto-optical recording storage media with better performance than those with heavy rare earths.

Report

(2 results)
  • 1987 Final Research Report Summary
  • 1986 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] T.Suzuki: Japanese J.Appl.Phys.24. L199-L202 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] T.Suzuki: J.Magnetism and Magnetic MAterials. 50. 265-270 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 鈴木孝雄: 電気学会マグネテックス研究会資料. MAG-85-91. 17-24 (1985)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] T.Suzuki: J.magnetism and Magnetic MAterials. 54-57. 1407-1408 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] T.Suzuki and T.Katayama: IEEE Trans.MAG.MAG-22. 1230-1233 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] T.Suzuki;A.Murakami and T.Katayama: IEEE Trans.MAG.MAG-23. (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 鈴木孝雄,片山利一,村上明,吉田直樹: 日本応用磁気学会誌. 11. 193-196 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] T.Suzuki: "Perpendicular Magnetic Anisotropy of Amorphous Fe-Nd alloy Thin Films" Japanese J.Appl.Phys.24. L199-L202 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] T.Suzuki: "Perpendicular Magnetic Anisotropy of Fe-Nd Alloy Thin Films" J.Magnetism and Magnetic Materials. 50. 265-270 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] T.Suzuki: "Magnetic Properties of Vertically magnetised Nd-Fe-Co Amorphous Films (in Japanese)" Proc.Magnetics of Elect.Society. MAG-85-91. 17-24 (1985)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] T.Suzuki: "Magnetic Properties and Microstructure of Perpendicular Magnetic Fe-Nd Sputtered Films" J.Magnetism and Magnetic MAterials. 54-57. 1407-1408 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] T.Suzuki and T.Katayama: "Magnetic and Magneto-optical Properties of Perpendicular Magnetic Nd-Fe-Co and Pr-Fe Amorphous Films" IEEE Trans.MAG-22. 1230-1233 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] T.Suzuki,A.Murakami and T.Katayama: "Magnetic and Magneto-optical Properties of (Nd,Pr)-(Fe,Co) Alloy Amorphous Films with Huge Perpendicular Magnetic Anisotropy; IEEE Trans." IEEE Trans.MAG-23. (1987 to be published.)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] T.Suzuki,T.Katayama,A.Murakami and N.Yoshida: "Magnetic and Magneto=optical Properties of LR-Fe-Co(LR=Nd,Pr) Amorphous Alloy Films." J.Magnetics Soc.Japan (1987).11. pp 193-196.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] T.Suzuki: Japanese Journal of Applied Physics. 24. L199-202 (1985)

    • Related Report
      1986 Annual Research Report
  • [Publications] T.Suzuki: Journal of Magnetism and Magnetic Materials. 50. 265-270 (1985)

    • Related Report
      1986 Annual Research Report
  • [Publications] T.Suzuki: Journal of Magnetism and Magnetic Materials. 54-57. 1407-1408 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] T.Suzuki and T.Katayama: IEEE Trans.of Magnetics. 22. 1230-1232 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] T.Suzuki,A.Murakami and T.Katayama: to be published in IEEE Trans.of Magnetics. Sept.(1987)

    • Related Report
      1986 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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