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

Development of high frequency soft magnetic thin films consisting of ferromagnetic alloy/ferromagnetic insulator multi-phase granular materials

Research Project

Project/Area Number 07555211
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Structural/Functional materials
Research InstitutionTohoku University

Principal Investigator

FUJIMORI Hiroyasu  Tohoku Univ., IMR Professor, 金属材料研究所, 教授 (60005866)

Co-Investigator(Kenkyū-buntansha) OHNUMA Shigehiro  The Res.Ins.of Elec.& Mag.Mat.Senior Researcher, 主任研究員 (50142633)
SAWAZAKI Tatsuo  Sumitomo Metal Industry Co.Researcher, 未来技術研究所, 研究員
SHIMA Toshiyuki  Tohoku Univ., IMR Research Associate, 金属材料研究所, 助手 (50261508)
MITANI Seiji  Tohoku Univ., IMR Research Associate, 金属材料研究所, 助手 (20250813)
Project Period (FY) 1995 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥20,700,000 (Direct Cost: ¥20,700,000)
Fiscal Year 1997: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1996: ¥7,000,000 (Direct Cost: ¥7,000,000)
Fiscal Year 1995: ¥11,500,000 (Direct Cost: ¥11,500,000)
Keywordsmagnetic thin film / nano-granular film / soft magnetic properties / high frequency magnetic materials / high electrical resistivity / eddy current loss / ferrite / sputtering / 磁性薄膜 / グラニュラー合金 / 薄膜 / 透磁率 / 電気抵抗 / 磁気異方性
Research Abstract

As small sizing and high frequency use of magnetic devices are extensively required nowadays, it is an important subject in the research field of magnetic materials to fabricate magnetic thin films with high saturation magnetization and high electrical resistivity. Nanogranular thin films consisting of magnetic metal and nonmagnetic insulator have been investigated so far, and fairly good soft magnetic properties (resistivity rho=100-500 muOMEGAcm, saturation magnetization Bs-10 kG) were achieved. However, further investigation and development of soft magnetic thin films with high electrical resistivity are currently required for applications such as high density magnetic recording heads etc. In this research project, we have investigated soft magnetic properties and electrical resistivity behavior of ferromagnetic alloy/ferromagnetic insulator multi-phase granular thin films.
Granular thin film samples were prepared by a sputtering technique with composite targets of ferromagnetic alloy and ferromagnetic insulator, and microstructure, electrical resistivity and magnetic properties were examined. From a systematic investigation for many kinds of combinations of ferromagnetic alloys and ferromagnetic insulators, we found that it is important to control surface reaction of ferromagnetic insulator on the film surface. Also, we found that Fe-MgFe_2O_4 and Ni-MgFe_2O_4 systems are candidates for very good soft magnetic thin films with high saturation magnetization and high electrical resistivity. For Fe-Mg-O multi-phase granular systems, good results, such as rho=100-400 and Bs=12-16 kG,were obtained in the optimized sputtering condition.
In addition to the results mentioned above, soft magnetic thin films of Co-Fe-Al-O exhibiting very high saturation magnetization (Bs=19 kG) has been achieved although its resistivity is fairly low( rho=100 muOMEGAcm) . It is considered that the Co-Fe-Al-O film can be used for application of high density magnetic recording heads.

Report

(4 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • 1995 Annual Research Report
  • Research Products

    (60 results)

All Other

All Publications (60 results)

  • [Publications] S.Ohnuma: "Co-(N or O)based granular thin films and their magnetic properties" Joumal of Alloys and Compounds. 222. 167-172 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Mitani: "High electrical resistivity and Mossbauer effect of soft magnetic Fe-SiO_2 granular alloys" Journal of Magnetism and Magnetic Materials. 140-144. 429-430 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 大石 繁弘: "高抵抗Co基膜の構造と磁気特性に及ぼす磁場中熱処理効果" 日本応用磁気学会誌. 19. 425-428 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Hayakawa: "Microtructure and magnetoresistance of Fe-ltf-o films with high electrical resistivity" Journal of Magnetism and Magnetic Materials. 154. 175-182 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Ohnuma: "High freguency magnitic properties in metal-nonmetal granular films" Jouranl of Applied Physics. 79. 5130-5135 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 早川 康男: "高電気抵抗Fe基ナノ結晶薄膜の磁気特性と磁気抵抗効果" 日本応用磁気学会誌. 20. 425-428 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 大沼 繁弘: "Co-Al-O系グラニュラー構造膜の高周波磁気特性" 日本応用磁気学会誌. 20. 489-492 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Hayakawa: "High resistive nanocrystalline Fe-M-O(M=Hf,Zr,rare earth metal)soft magnetic films for high freguency applications" Journal of Applied Physics. 81. 3747-3752 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 小林 伸聖: "Fe-X-O(X=Y,NdiSm,Gd,Tb,Py)系高電気抵抗膜の軟磁気特性" 日本応用磁気学会誌. 20. 469-472 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 小林 伸聖: "Fe-X-O(X=Y,Nd,Sm,Gd,Tb,Dy)系薄膜の磁気特性に及ぼすNi,Pd,Ptの添加効果" 日本応用磁気学会誌. 20. 473-476 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Shima: "Magnetostriction and magnitic properties of Sm-Fe-Band Tb-Fe-B thin films and multilayers" Journal of Alloys and Compunds. 258. 149-154 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 三谷 誠司: "Fe基金属-酸化物グラニュラー構造薄幕の巨大磁気抵抗とHall効果" 日本応用磁気学会誌. 21. 465-468 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] M.Ohnuma: "Microtructure of Co-Al-O granular alloy thin films" Journal of Applied Physics. 82. 5646-5652 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Asami: "XPS characterization of high electrical resistance soft magnetic thin Co-Al-N films" Proc.of 7th Europian Conf.on Applications of Surface and Interface Analysis. 609-612 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 柳田 康彦: "高電気抵抗軟磁性Co-Al-OをハイブリッドにしたスピンバルブMRセンサ" 日本応用磁気学会誌. 22(in press). (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 大沼 繁弘: "高いBsを有するCo-Fe-Al-O膜の軟磁気特性" 日本応用磁気学会誌. 22(in press). (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 李 希宰: "高電気抵抗Fe-Mg-O薄膜の軟磁気特性" 日本応用磁気学会誌. 22(in press). (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 大沼 繁弘: "高電気抵抗軟磁性膜" 日本応用磁気学会誌. 19. 19-25 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 大沼 繁弘: "Co系グラニュラー構造膜の磁気特性" 第91回日本応用磁気学会応用磁気研究会. 7-14 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 藤森 啓安: "ソフト磁性材料" 日本応用磁気学会誌. 21. 99-106 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 大沼 繁弘: "高電気抵抗軟磁性薄幕の開発の現状" 電気学会マグネティクス研究会資料. MAG-97-2. 3-8 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 白川 究: "薄膜磁気デバイスの最近の研究" 金属. 67. 379-388 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Ohnuma, H.Fujimori, S.Furukawa, S.Mitani and T.Masumoto: "Co- (N or O) based granular thin films and their magnetic properties" J.Alloys and Compounds. 222. 167-172 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Mitani, H.Fujimori, S.Furukawa and S.Ohnuma: "High electrical resistivity and Mossbauer effect of soft magnetic Fe-SiO2 granular alloys" J.Magn.Magn.Mater.140-144. 429-430 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Ohnuma, S.Mitani, H.Fujimori, T.Masumoto: "Effect of magnetic annealing on the structure and magnetic properties of highly resistive Co-based films" J.Mag.Soc.Jpn. 19. 425-428 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Hayakawa, N.Hasegawa, A.Makino, S.Mitani and H.Fujimori: "Microstructure and magnetoresistance of Fe-Hf-O films with high electrical resistivity" J.Magn.Magn.Mat.154. 175-182 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Ohnuma, H.Fujimori, S.Mitani and T.Masumoto: "High frequency magnetic properties in metal-nonmetal granular films (invited)" J.Appl.Phys. 79. 5130-5135 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Hayakawa, N.Hasegawa, A.Makino, S.Mitani and H.Fujimori: "Magnetic properties and magnetoresistance of nanocrystalline Fe-based films with high electrical resistivity" J.Mag.Soc.Jpn. 20. 425-428 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Ohnuma, S.Mitani, H.Fujimori and T.Masumoto: "Soft magnetic properties at high frequencies of Co-Al-O films with granular structure" J.Mag.Soc.Jpn. 20. 489-492 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Hayakawa, A.Makino, H.Fujimori and A.Inoue: "High resistive nanocrystalline Fe-M-O (M=Hf, Zr, rare-earth metals) soft magnetic films for high-frequency applications" J.Appl.Phys. 81. 3747-3752 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] N.Kobayashi, S.Ohnuma, H.Fujimori and T.Masumoto: "Soft magnetic properties of highly electrically resistive Fe-X-O (X=Y,Nd, Sm, Gd, Tb, Dy) films" J.Mag.Soc.Jpn. 20. 469-472 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] N.Kobayashi, S.Ohnuma, H.Fujimori and T.Masumoto: "Effect of Ni, Pd or Pt addition on the magnetic properties of Fe-X-O (X=Y,Nd, Sm, Gd, Tb, Dy) films" J.Mag.Soc.Jpn. 20. 473-476 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Shima, H.Yokoyama and H.Fujimori: "Magnetostriction and magnetic properties of Sm-Fe-B and Tb-Fe-B thin films and multilayrs" Journal of Alloys and Compounds. 258. 149-154 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Mitani, Y.Shintani and H.Fujimori: "Giant magnetoresistance and Hall effect in Fe-based metal-oxide granular thin films" J.Mag.Soc.Jpn. 21. 465-468 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] M.Ohnuma, E.Abe, K.Hono, H.Onodera, S.Mitani, and H.Fujimori: "Microstructure of Co-Al-O granular alloy thin films" J.Appl.Phys.82. 5646-5652 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Asami, S.Ohnuma and T.Masumoto: "XPS characterization of high electrical resistance soft magnetic thin Co-Al-N films" Proc.of 7th Europian Conference on Applications of Surface and Interface Analysis. 609-612 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Y.Yanagida, K.Saito, S.Miatni, H.Itoh and H.Fujimori: "MR characteristics of spin-valve films coupled with CoAlO soft magnetic layrs" J.Mag.Soc.Jpn. 22 (in press). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.J.Lee, S.Mitani, T.Shima and H.Fujimori: "High electrical resistivity and soft magnetic properties of Fe0Mg-O thin films" J.Mag.Soc.Jpn. 22 (in press). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Ohnuma, N.Kobayashi, T.Masumoto and H.Fujimori: "Soft magnetic properties of Co-Fe-Al-O films with high Bs" J.Mag.Soc.Jpn. 22 (in press). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Ohnuma and S.Mitani: "Soft magnetic films with high electrical resistivity" J.Mag, Soc.Jpn. 19. 19-25 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Ohnuma and H.Fujimori: "Magnetic properties of Co-based granular films" J.Mag.Soc.Jpn, abstract of 91st meeting. 7-14 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Fujimori: "Soft magnetic materials" J.Mag.Soc.Jpn. 21. 99-106 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] S.Ohnuma and T.Masumoto: "Recent development of soft magnetic films with high electrical resistivity" Elec.Soc. MAG-97-2. 3-8 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Shirakawa, S.Ohnuma, E.Sugawara, M.Mitera and T.Masumoto: "Recent study of magnetic thin film devices" Metal 67. 379-388 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] M.Ohnuma: "Microstructure of Co-Al-O granular alloy thin films" Journal of Applied Physics. 82. 5646-5652 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] S.Mitani: "Anomalous behavior of temperature and bias-voltage dependence of tunnel-type GMR in insulating granular systems" Journal of Applied Physics. (in press). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 柳田 康彦: "高電気抵抗軟磁性Co-Al-OをハイブリッドしたスピンバルブMRセンサ" 日本応用磁気学会誌. 22(in press). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 李 希宰: "高電気抵抗Fe-Mg-O薄膜の軟磁気特性" 日本応用磁気学会誌. 22(in press). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 大沼繁弘: "高いB_Sを有するCo-Fe-Al-O膜の軟磁気特性" 日本応用磁気学会誌. 22(in press). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 大沼繁弘: "高電気抵抗軟磁性薄膜の開発の現状" マグネティックス研究会資料. MAG-97-2. 3-8 (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] Y.Hayakawa: "High resistive nanocrystalline Fe-M-O (M=Hf, Zr, rare-earth metals) soft magnetic films for high frequency applications" Journal of Applied Physics. (in press). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 小林伸聖: "Fe-X-O (X=Y, Nd, Sm, Gd, Td, Dy)系薄膜の磁気特性に及ぼすNi, Pd, Ptの添加効果" 日本応用磁気学会誌. 20. 473-476 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 大沼繁弘: "Co基高電気抵抗軟磁性膜" マグネティックス研究会資料. MAG-96-158〜170. 1-9 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 三谷誠司: "Fe基金属-酸化物グラニュラー構造薄膜の巨大磁気抵抗とHall効果" 日本応用磁気学会誌. 21. (in press) (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] S.Mitani: "Spin-dependent tunneling phenomena in insulating granular systems" Journal of Magnetism and Magnetic Materials. 165. 141-148 (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] S. Ohnuma: "High freguency magnetic properties in meal-nonmetal granular films" Journal of Applied Physics. (in press).

    • Related Report
      1995 Annual Research Report
  • [Publications] 大沼 繁弘: "Co-Al-O系グラニュラー構造膜の高周波軟磁気特性" 日本応用磁気学会誌. 20(in press). (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] H. Fujimori: "Tunnel-type GMR inCo-Al-O insulated granular system-Its oxygen-concentration dependence-" Journal of Magnetism and Magnetic Materials. (in press).

    • Related Report
      1995 Annual Research Report
  • [Publications] 早川 康男: "高電気抵抗Fe基力結晶薄膜の磁気特性と磁気抵抗効果" 日本応用磁気学会誌. 20(in perss). (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 小林 伸聖: "Fe-X-O(X=Y, Nd, Sm, Gd, Tb, Dy)系高電気抵抗膜の軟磁気特性" 日本応用磁気学会誌. 20(in press). (1996)

    • Related Report
      1995 Annual Research Report

URL: 

Published: 1995-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi