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Search of novelty Mn-based Heusler alloys with high half-metallicity and high phase stability

Research Project

Project/Area Number 24656366
Research Category

Grant-in-Aid for Challenging Exploratory Research

Allocation TypeSingle-year Grants
Research Field Physical properties of metals
Research InstitutionTohoku University

Principal Investigator

UMETSU Rie  東北大学, 金属材料研究所, 准教授 (60422086)

Project Period (FY) 2012-04-01 – 2014-03-31
Project Status Completed (Fiscal Year 2013)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2012: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords電子・磁気物性 / ハーフメタル / 磁気モーメント / 相安定性 / 結晶規則度 / Mn基ホイスラー合金 / 電子状態 / キュリー温度
Research Abstract

Phase stability and magnetic properties of half-metallic Mn-based Heusler alloys were investigated. It is confirmed that the highly ordered L21 phase can is obtained by appropriate heat treatments for controlling the degree of order and microstructure. In this case, the magnetic moment of the Mn2VAl well accords with the theoretical value of 2 mB/f.u., suggesting that the electronic state shows half-metallicity. Value of the spin-stiffness constant from the magnetization measurements of the Mn2VAl is about 5.5 meV-(nm)2, and it is about twice as large as that of the Co-based Heusler alloys having similar values of the Curie temperature. This means that the magnetic state of Mn2VAl is significantly stable. In addition, single crystal of the Mn2VAl was grown for photoelectron spectroscopy measurements. It is also confirmed that single phase of the L21-type Mn2VGa and Mn2CoGa alloys can be obtained.

Report

(3 results)
  • 2013 Annual Research Report   Final Research Report ( PDF )
  • 2012 Research-status Report
  • Research Products

    (17 results)

All 2014 2013 2012 Other

All Journal Article (4 results) (of which Peer Reviewed: 4 results) Presentation (11 results) (of which Invited: 2 results) Remarks (2 results)

  • [Journal Article] Magnetic properties and phase stability of Co2Cr(Ga,Si) Heusler alloys2014

    • Author(s)
      Rie Umetsu, Akinari Okubo, X. Xu, Ryosuke Kainuma
    • Journal Title

      Journal of Alloys and Compounds

      Volume: 588 Pages: 153-157

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Phase equilibria in the Mn-rich portion of Mn–Ga binary system2012

    • Author(s)
      K. Minakuchi, R.Y. Umetsu, K. Ishida, R. Kainuma
    • Journal Title

      J. Alloys Compds

      Volume: 537 Pages: 332-227

    • DOI

      10.1016/j.jallcom.2012.04.065

    • Related Report
      2013 Final Research Report
    • Peer Reviewed
  • [Journal Article] Substitution effects of Cr or Fe on the Curie temperature for Mn-based layered compounds MnAlGe and MnGaGe with Cu_2Sb-type structure

    • Author(s)
      R.Y. Umetsu, Y. Mitsui, I. Yuito, T. Takeuchi, H. Kawarada
    • Journal Title

      IEEE Trans. Magn

      Volume: (in press)

    • URL

      http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=20

    • Related Report
      2013 Final Research Report
    • Peer Reviewed
  • [Journal Article] Phase stability of L2_1 phase in Co-based Heuser alloys

    • Author(s)
      R.Y. Umetsu, A. Okubo, M. Nagasako, M. Ohtsuka, K. Ishida, R. Kainuma
    • Journal Title

      SPIN

      Volume: (in press)

    • URL

      http://www.worldscientific.com/worldscinet/spin

    • Related Report
      2013 Final Research Report
    • Peer Reviewed
  • [Presentation] Phase stability and magnetic properties of half-metal-type Heusler alloys (発表確定)2014

    • Author(s)
      R.Y. Umetsu
    • Organizer
      3^<rd> International Conference of Asian Union of Magnetics Societies (IcAUMS)
    • Place of Presentation
      Haikou, China
    • Related Report
      2013 Final Research Report
    • Invited
  • [Presentation] Mn_2VAlホイスラー合金の規則度と磁気特性2014

    • Author(s)
      梅津理恵、大久保亮成、長迫実、貝沼亮介
    • Organizer
      日本物理学会第69回年次大会
    • Place of Presentation
      平塚市
    • Related Report
      2013 Final Research Report
  • [Presentation] Cu_2Sb型Mn系層状化合物のキュリー温度に及ぼす元素置換効果2014

    • Author(s)
      梅津理恵,三井好古,由比藤勇,竹内輝明
    • Organizer
      日本金属学会春期大会
    • Place of Presentation
      東京
    • Related Report
      2013 Final Research Report
  • [Presentation] Phase stability and magnetic properties of half-metal-type Heusler alloys2014

    • Author(s)
      Rie Y. Umetsu
    • Organizer
      3rd International Conference of Asian Union of Magnetics Societies (IcAUMS)
    • Place of Presentation
      Haikou, China
    • Related Report
      2013 Annual Research Report
    • Invited
  • [Presentation] Mn_2VAl合金の磁気的性質に及ぼす熱処理効果2013

    • Author(s)
      梅津理恵,大久保亮成,貝沼亮介
    • Organizer
      日本金属学会秋期大会
    • Place of Presentation
      金沢
    • Related Report
      2013 Final Research Report
  • [Presentation] Annealing temperature dependence of magnetic properties of Mn_2VAl alloy2013

    • Author(s)
      R.Y. Umetsu, A. Okubo, R. Kainuma
    • Organizer
      The 3rd International Symposium on Advanced Magnetic Materials and Applications (ISAMMA 2013)
    • Place of Presentation
      Taichung, Taiwan
    • Related Report
      2013 Final Research Report
  • [Presentation] Annealing temperature dependence of magnetic properties of Mn2VAl alloy2013

    • Author(s)
      Rie Umetsu, Akinari Okubo, Ryosuke Kainuma
    • Organizer
      The 3rd International Symposium on Advanced Magnetic Materials and Applications (ISAMMA 2013)
    • Place of Presentation
      Taichung, Taiwan
    • Related Report
      2012 Research-status Report
  • [Presentation] Co-Mn-Ga 3元系状態図の実験的決定2012

    • Author(s)
      水口知大、小林恒誠、梅津理恵、石田清仁、貝沼亮介
    • Organizer
      日本金属学会秋期大会
    • Place of Presentation
      愛媛
    • Related Report
      2013 Final Research Report
  • [Presentation] Mn2VAl合金の磁気的性質に及ぼす熱処理効果

    • Author(s)
      梅津理恵, 大久保亮成, 貝沼亮介
    • Organizer
      日本金属学会秋期大会
    • Place of Presentation
      金沢
    • Related Report
      2013 Annual Research Report
  • [Presentation] ハーフメタル型強磁性体Co基ホイスラー合金の相状態と磁気特性

    • Author(s)
      梅津理恵
    • Organizer
      日本金属学会秋期大会
    • Place of Presentation
      東京
    • Related Report
      2013 Annual Research Report
  • [Presentation] Mn2VAlホイスラー合金の規則度と磁気特性

    • Author(s)
      梅津理恵,大久保亮成,長迫実,貝沼亮介
    • Organizer
      日本物理学会 第69回年次大会
    • Place of Presentation
      平塚
    • Related Report
      2013 Annual Research Report
  • [Remarks]

    • URL

      http://adox-system.sakura.ne.jp/bmg_member/?p=15

    • Related Report
      2013 Final Research Report
  • [Remarks] 梅津理恵 研究紹介

    • URL

      http://adox-system.sakura.ne.jp/bmg_member/?p=15

    • Related Report
      2013 Annual Research Report

URL: 

Published: 2013-05-31   Modified: 2019-07-29  

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