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

Study on growth mechanism and dynamic magnetization reversal process in Nd-Fe-B thin film

Research Project

Project/Area Number 02555060
Research Category

Grant-in-Aid for Developmental Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 電子材料工学
Research InstitutionKyushu Institute of Technology

Principal Investigator

OHKOSHI Masatoshi  Kyushu Institute of Technology, Faculty of Computer Science, Associate Professor, 情報工学部, 助教授 (90112177)

Co-Investigator(Kenkyū-buntansha) WATANABE Naohiro  Kyushu Institute of Technology, Faculty of Computer Science, Assistant Professor, 情報工学部, 助手 (30230981)
MAKI Kouichiro  Sumitomo Metals & Mining, Co. Central laboratory, Chief researcher, 中央研究所, 主任研究員
TSUSHIMA Kuniro  Kyushu Institute of Technology, Faculty of Computer Science, Professor, 情報工学部, 教授 (50217296)
Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥17,500,000 (Direct Cost: ¥17,500,000)
Fiscal Year 1991: ¥5,100,000 (Direct Cost: ¥5,100,000)
Fiscal Year 1990: ¥12,400,000 (Direct Cost: ¥12,400,000)
Keywordsmagneto-optic memory / magnetic thin film / permanent magnet / high speed camera / magnetic domain / domain wall / coercivity
Research Abstract

In order to improve the magneto-optical disc and Nd-Fe-B magnet it is important to know the mechanism of coercivity by investigating the growth mechanism of Nd-Fe-B film and dynamic magnetization reversal process, which depends on the microstructure. Nd-Fe-B film and Fe film were prepared by RF magnetron sputtering. Growth process in the initial stage was studied by RHEED and electrical resistivity in situ.
The resistivity decrease exponentially against film thickness until 30 A due to the two dimensional growth of the nuclei. The resistivity decrease further until a critical thickness of 50 A by developing inland, and forms continuous film. The critical thickness is about 50 A below 150 C of the substrate temperature. The resistivity is high for the film deposited at high substrate temperature because of rough surface, which is Associated with an increased size of inland at the initial growth when the substrate temperature is above 200 C, and the critical thickness increase more than 100 A for high substrate temperature. Grain size and crystal orientation depend on the concentration of Nd and B. Magnetic properties and magneto-optical effects of Nd-Fe-B films were studied. Microstructure, magnetic anisotropy, and coercivity change at a certain composition region.
Fe films were deposited further by excimer laser ablation method. The crystallinity of the Fe film prepared at high repetition rate is high and shows high coercivity, which is associated with a formation of the Fe-N phase.
Domain wall movement including domain nucleation and wall propergation was studied by high speed framing streak camera. Three stable states of bubble domain with different diameter were found, after chopping the stripe domain by 10 nsec pulse field. Bloch line was observed successfully, and the velocity exceeds 1 km/sec which depends on the length of the Bloch line.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (23 results)

All Other

All Publications (23 results)

  • [Publications] M.Ohkoshi,N.Watanabe,K.Tsushima: "Ferromagnetic Resonance in Co/W Multilayers." Digests of Annual Conf.on MAGNETICS in Jpn.14. 320 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M.Ohkoshi,N.Watanabe,K.Tsushima: "Magnetic and Structural Characterization of Cobalt/Tungsten Multilayers." Proc.13th Int.Colloq.on Mag.Films & Surfaces to be published in J.M.M.M.13. 257-258 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] P.J.Grundy,A.K.Petford-Long,M.Ohkoshi: "Microstructure and related magnetic properties of Co-based multilayers" Proc.Int.Workshop on Magnetic Superstructured Films. 1. 14-16 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 大越 正敏,吉武 剛,石川 文英,渡辺 直寛,対馬 国郎: "エキシマレ-ザ-アブレ-ションによるFe薄膜" 日本応用磁気学会学術講演概要集. 15. 235-235 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 大越 正敏,犬丸 祥美,渡辺 直寛,対馬 国郎: "スパッタリングFe薄膜の成長機構" 日本応用磁気学会学術講演概要集. 15. 238-238 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M.Ohkoshi,N.Watanabe,K.Tsushima: "Domain wall dynamics studied by dark field microscopy." J.Mag.Mag.Mater.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M. Ohkoshi, N. Watanabe, and K. Tsushima: "Ferromagnetic Resonance in Co/W multilayers" Digests of Annual Conf. Magnetics in Japan. 14. 320 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] K. Tsushima, M. Ohkoshi, and N. Watanabe: "Microwave absorption of Bi_2Sr_2CaCu_2O_<8-> delta single crystal grown by flotation zone method" Digests of Annual Conf. Magnetics in Japan. 14. 357 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M. Ohkoshi, N. Watanabe and K. Tsushima: "Ferromagnetic Resonance in Co/W multilayers" Proc. 13th ICMFS. 257-258 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] P. J. Grundy, A. K. Petford-Long, M. Ohkoshi: "Microstructure and related magnetic properties of Co-based multilayers" Proc. International Workshop on Magnetic Superstructured Films. 14-16 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M. Ohkoshi, T. Yoshitake, B. Ishikawa, N. Watanabe, and K. Tsushima: "Fe film prepared by excimer laser ablation" Digests of Annual Conf. Magnetics in Japan. 15. 235 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M. Ohkoshi, Y. Inumaru, N. Watanabe, and K. Tsushima: "Growth mechanism of sputtered Fe film" Digests of Annual Conf. Magnetics in Japan. 15. 238 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M. Ohkoshi, N. Watanabe and T. Tsushima: "Growth mechanism of magnetron-sputtered Nd-Fe-B film detected by in situ resistivity measurement" J. Vac. Sci. & Technol.(1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] M.Ohkoshi,N.Watanabe,K.Tsushima: "Ferromagnetic Resonance in Co/W Multilayers." Digests of Annual Conf.on MAGNETICS in Jpn.14. 320- (1990)

    • Related Report
      1991 Annual Research Report
  • [Publications] M.Ohkoshi,N.Watanabe,K.Tsushima: "Magnetic and Structural Characterization of Cobalt/Tungsten Multilayers." Proc.13th Int.Colloq.on Mag.Films & Surfaces to be published in J.M.M.M.13. 257-258 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] P.J.Grundy,A.K.Petford-Long,M.Ohkoshi: "Microstructure and related magnetic properties of Co-based multilayers" Proc.Int.Workshop on Magnetic Superstructured Films. 1. 14-16 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 大越 正敏,吉武 剛,石川 文英,渡辺 直寛,対馬 国郎: "エキシマレ-ザ-アブレ-ションによるFe薄膜" 日本応用磁気学会学術講演概要集. 15. 235-235 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 大越 正敏,犬丸 祥美,渡辺 直寛,対馬 国郎: "スパッタリングFe薄膜の成長機構" 日本応用磁気学会学術講演概要集. 15. 238-238 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] M.Ohkoshi,N.Watanabe,K.Tsushima: "Domain wall dynamics studied by dark field microscopy." J.Mag.Mater.

    • Related Report
      1991 Annual Research Report
  • [Publications] M.Ohkoshi,N.Watanabe,K.Tsushima: "Ferromagnetic Resonance in Co/W Multilayers." Digests of Annual Conf.on MAGNETICS in Jpn.14. 320-320 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] M.Ohkoshi,N.Watanabe,K.Tsushima: "Magnetic and Structural Characterization of Cobalt/Tungsten Multilayers." 13th Int.Colloq.on Mag.Films & Surfaces.

    • Related Report
      1990 Annual Research Report
  • [Publications] M.Ohkoshi,N.Watanabe,K.Tsushima: "Growth mechanism of magnetronーsputtered Fe film detected by in situ resistivity measurement." J.Vac.Sci.& Technol.

    • Related Report
      1990 Annual Research Report
  • [Publications] M.Ohkoshi,N.Watanabe,K.Tsushima: "Domain wall dynamics studied by dark field microscopy." J.Mag.Mag.Mater.

    • Related Report
      1990 Annual Research Report

URL: 

Published: 1990-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi