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2002 Fiscal Year Final Research Report Summary

Search for a new bulk ferromagnet with controlling interatomic distance and valence electron number

Research Project

Project/Area Number 12650655
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Physical properties of metals
Research InstitutionUniversity of Tsukuba

Principal Investigator

KOYANO Tamotsu  Univ. of Tsukuba, Inst. of Mater. Sci., Assist. Prof., 物質工学系, 講師 (00215419)

Co-Investigator(Kenkyū-buntansha) OHTSUKA Hideyuki  Nat'1 Inst. of Mater. Sci., Senior Researcher, 材料研究所, 主任研究員 (10343857)
YOSHIZAKI Ryozo  Univ. of Tsukuba, Inst of Mater. Sci., Prof., 物質工学系, 教授 (70011137)
IKEDA Hiroshi  Univ. of Tsukuba, Inst. of Mater. Sci., Assist. Prof., 物質工学系, 講師 (50272167)
Project Period (FY) 2000 – 2002
KeywordsHigh magnetic field / Iron nitride / α'-FeN / Matensitic transformation / magnetic properties / heat treatment / α"-Fe_<16>N_2
Research Abstract

Composition dependence of magnetization for the 3d transition metal alloys is well described with the Slater-Pauling curve. The valence electron number plays an essentially important role to explain this behavior with the rigid band model and the highest value is attained in bcc alloys between Fe and Co. It is also known through high pressure experiments that magnetization of 3d bcc alloys decreases with increasing pressure, i. e., decreasing interatomic distance. Therefore, it is plausible to appear a high magnetization material at vicinity of electron number of 26 and with a larger lattice constant than at ambient pressure. The straight way to access the larger interatomic distance is to utilize epitaxial growth technique. But, instead, present project introduces interstitial atoms, such as nitrogen or carbon, into bcc matrix with a hope to produce bulk material. The method we employed is described in following sentences ; the high temperature phase of fee Fe-N or Fe-C is quenched to room temperature, and cooled to 4. 2K in order to transform them into bet structure with ferroiagnetism via the Martensitic transformation, fith application of high magnetic field of 35 T on the Fe-N alloy with 9. 6 at. %N, volume fraction of the bet phase increased to 91 % and attained spontaneous magnetization of 215 emu/g from 160 emu/g for zero magnetic field. Heat treatment at 120C partially transforms it into α" phase, but no indication of giant magnetization was observed. The magnetic field induced Martensitic transformation also took place in the Fe-C system, but resulted in smaller magnetization than Fe-N system. We substituted Mn for Fe in Fe-N alloy with aim of changing 3d electron number, but failed to produce single phase of γ.

  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] 古谷野有: "磁場誘起マルテンサイト変態を利用したbct窒化鉄の作成"ふぇらむ. 8. 143-145 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Ono: "Electrical Conduction and Tunneling Magnetoresistance of Fe, Co/MgF_2 Granular Multilayers"Jpn. J. Appl. Phys., Part 1. 41. 97-102 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 池田博: "MgB2の磁化緩和"日本金属学会誌. 66. 334-338 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Ikeda: "Transport and Magnetic Properties of Superconducting MgB_2"Physica C. 378. 499-502 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Koyano: "Effect of Magnetic Field on γ→α' Martensitic Transformation and Magnetization of ・' and ・" Iron-nitrides"Mater. Trans, JIM. 41. 923-927 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Ikeda: "Improvement of the Boil-off Rate on Cryostat Using Pulse Tube Refrigerator"Proc the 6th Japan-Sino Joint Seminer on Cryocooler and its Application. 226-229 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Koyano: "Martensitic transformation of γ-FeN in high magnetic field and magnetic properties of bct iron nitrides"Bulletin of the Iron and Steel Inst. of Jpn.. 8. 143-145 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Koyano et al.: "Martensitic Transformation of γ-FeN in High Magnetic Field Generated by a Hybrid Magnet"Trans. MRS-J. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K. Ono et al.: "Electrical Conduction and Tunneling Magnetoresistance of Fe, Co/MgF_2 Granular Multilayers"Jpn. J. Appl. Phys., Part 1. 41. 97-102 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Ikeda: "Magnetic relaxation of MgB2"J. Jpn. Inst. Metals.. 66. 334-338 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Ikeda: "Transport and Magnetic Properties of Superconducting MgB2"Physica C. 378-381. 499-502 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Koyano: "Effect of Magnetic Field on r - α ' Martensitic Transformation and Magnetization of α' and α" Ironnitrides"Mater. Trans., JIM. 41. 923-927 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Ikeda: "Improvement of the Boil-off Rate on Cryostat Using Pulse Tube Refrigerator"Proc the 6th Japan-Sino Joint Seminer on Cryocooler and its Application. 1999. 226-229

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2004-04-14  

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