Phase stability and magnetic properties of Mn-noble metal alloys for spintronics devices

• Project/Area Number: 19760482
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Structural/Functional materials
• Research Institution: Tohoku University
• Principal Investigator: UMETSU Rie Tohoku University, 多元物質科学研究所, 助教 (60422086)
• Project Period (FY): 2007 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥3,660,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥360,000); Fiscal Year 2008: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2007: ¥2,100,000 (Direct Cost: ¥2,100,000)
• Keywords: Mn基合金 / スピントロニクス / ピン止め層 / 高ネール点 / 状態図 / Mn系合金 / スピントロニクス材料 / 永久磁石 / ネール温度 / 電子比熱係数

Research Abstract

巨大磁気抵抗効果を示すデバイス素子の反強磁性層として重要な役割を担う、Mn系反強磁性合金の基礎物性、ならびに状態図に関する研究を行った。L1_0型MnRh合金の磁化、電気抵抗測定、ならびに低温比熱測定を行い、フェルミ面近傍の電子状態密度が低いことを示唆する結果が得られた。MnPdおよびMnGa合金については実用材料として重要なfcc-γ相やL1_0型-β相等の単相領域を明らかにした。

Research Products

• [Journal Article] Metamagnetic behavior under high magnetic fields in Ni_<50>Mn_<50-x>In_x (x=14.0 and 15.6) shape memory alloys (2009)
  • Author(s): R. Y. Umetsu, Y Kusakari, T Kanomata, K Suga, Y Sawai, K Kindo, K Oikawa, R Kainuma and K Ishida
  • Journal Title: J. Phys. D : Appl. Physics 42 Pages: 75003-75003
  • Peer Reviewed
• [Journal Article] Anomaly in entropy change between parent and martensite phases in the Ni_<50>Mn_<34>In_<16> Heusler alloy (2009)
  • Author(s): R. Y. Umetsu, W. Ito, K. Ito, K. Koyama, A. Fujita, K. Oikawa, K. Watanabe, T. Kanomata, R. Kainuma and K. Ishida
  • Journal Title: Scripta Materialia 60 Pages: 25-28
  • Peer Reviewed
• [Journal Article] Metamagnetic behavior under high magnetic fields in Ni_<50> Mn_<50-x>In_x, (x = 14.0 and 15.6) shape memory alloys (2009)
  • Author(s): R. Y. Umetsu, Y Kusakari, T Kanomata, K Suga, Y Sawai, K Kindo, K Oikawa, R Kainuma and K Ishida
  • Journal Title: J. Phys. D : Appl. Physics 42 Pages: 75003-75003
  • Peer Reviewed
• [Journal Article] Mossbauer study on Martensite Phase in Ni_<50>Mn_<36.5>^<57>Fe_<0.5>Sn_<13> Metamagnetic Shape Memory Alloy (2008)
  • Author(s): R. Y. Umetsu R. Kainuma, Y. Amako, Y. Taniguchi, T. Kanomata, K. Fukushima, A. Fujita, K. Oikawa and K. Ishida
  • Journal Title: Appl. Phys. Lett. 93 Pages: 42509-42509
  • Peer Reviewed
• [Journal Article] Atomic ordering and magnetic properties in Ni_2Mn(Ga_xAl_<1-x>) Heusler alloys (2008)
  • Author(s): H. Ishikawa, R. Y. Umetsu, K. Kobayashi, A. Fujita, R. Kainuma, K. Ishida
  • Journal Title: Acta Materialia 56 Pages: 4789-4797
  • Peer Reviewed
• [Journal Article] Mossbauer study on Martensite Phase in Ni_<50> Mn_<36.5> ^<57>Fe_<0.5>Sn_<13> Metamagnetic Shape Memory Alloy (2008)
  • Author(s): R.Y. Umetsu, R. Kainuma, Y. Amako, Y. Taniguchi, T. Kanomata, K. Fukushima, A. Fujita, K. Oikawa and K. Ishida
  • Journal Title: Appl. Phys. Lett 93 Pages: 42509-42509
  • Peer Reviewed
• [Journal Article] Atomic ordering and magnetic properties in Ni_2Mn (Ga_xAl_<1-x> ) Heusler alloys (2008)
  • Author(s): H. Ishikawa, R. Y. Umetsu, K. Kobayashi, A. Fujita, R. Kainuma, K. Ishida
  • Journal Title: Acta Materialia 56 Pages: 4789-4797
  • Peer Reviewed
• [Journal Article] Pd-In-Fe shape memory alloy (2007)
  • Author(s): H. Ishikawa, Y. Sutou, T. Omori, K. Oikawa, K. Ishida, A. Yoshikawa, R. Y. Umetsu, and R. Kainuma
  • Journal Title: Appl. Phys. Lett. 90 Pages: 261906-261906
  • Peer Reviewed
• [Journal Article] Electronic Structures, phase transformation and magnetic properties of L1_0 and B2-type MnRh equiatomic Alloys (2007)
  • Author(s): R. Y. Umetsu K. Fukamichi and A. Sakuma
  • Journal Title: J. Phys. Soc. Jpn. 76 Pages: 104712-104712
  • Peer Reviewed
• [Journal Article] Electrical Structures and Magnetic Phase Stability of L1_0 and B2-Type Equiatomic Alloys. (2007)
  • Author(s): Rie Y. UMETSU
  • Journal Title: Journal of the Physical Society of Japan 76
  • Peer Reviewed
• [Presentation] Pd-Mn-Sn合金の磁性 (2009)
  • Author(s): 鹿又 武、千枝祐輔、菅原俊也、佐野賢二、長迫 実、梅津理恵、貝沼亮介、宍戸統悦、西原弘訓
  • Organizer: 日本金属学会
  • Place of Presentation: 東京
  • Year and Date: 2009-03-29
• [Presentation] Ni_<50>Mn_<34>In_<16>合金の強磁場中磁化測定 (2008)
  • Author(s): 梅津理恵,伊東 航,伊藤恒平,小山佳一,藤田麻哉,及川勝成,鹿又 武,貝沼亮介,石田清仁
  • Organizer: 日本金属学会
  • Place of Presentation: 熊本
  • Year and Date: 2008-09-24
• [Presentation] Pd-In-Fe合金のマルテンサイト変態と磁気特性 (2008)
  • Author(s): 石川博康、須藤祐司、大森俊洋、梅津理恵、貝沼亮介、石田清仁
  • Organizer: 日本金属学会
  • Place of Presentation: 熊本
  • Year and Date: 2008-09-24
• [Presentation] Ni-Co-Mn-Sn放電プラズマ焼結材におけるメタ磁性形状記憶効果 (2008)
  • Author(s): 伊藤恒平、伊東航、梅津理恵、田島伸、川浦宏之、貝沼亮介、石田清仁
  • Organizer: 日本金属学会
  • Place of Presentation: 熊本
  • Year and Date: 2008-09-24
• [Presentation] Ni-Co-Mn-Snメタ磁性形状記憶合金の薄膜化と磁気特性の評価 (2008)
  • Author(s): 大塚 誠、梅津理恵、貝沼亮介、石田清仁
  • Organizer: 日本金属学会
  • Place of Presentation: 熊本
  • Year and Date: 2008-09-24
• [Presentation] Ni_<50> Mn_<34> In_16合金の強磁場中磁化測定 (2008)
  • Author(s): 梅津理恵, 伊東航, 伊藤恒平, 小山佳一, 藤田麻哉, 及川勝成, 鹿又武, 貝沼亮介, 石田清仁
  • Organizer: 日本金属学会
  • Place of Presentation: 熊本
  • Year and Date: 2008-09-24
• [Presentation] Pd-In-Fe合金のマルテンサイト変態と磁気特性 (2008)
  • Author(s): 石川博康、須藤祐司、大森俊洋、梅津理恵、貝沼亮介、石田清仁
  • Organizer: 日本金属学
  • Place of Presentation: 熊本
  • Year and Date: 2008-09-24
• [Presentation] Pd-Mn-Sn合金の磁性 (2008)
  • Author(s): 鹿又武、千枝祐輔、菅原俊也、佐野賢二、長迫実、梅津理恵、貝沼亮介、宍戸統悦、西原弘訓、
  • Organizer: 日本金属学会
  • Place of Presentation: 東京
  • Year and Date: 2008-09-24
• [Remarks]
  • URL: http://www.tagen.tohoku.ac.jp/labo/kainuma/j/
• [Remarks]
  • URL: http://www.tagen.tohoku.ac.jp/labo/kainuma/j/
• [Remarks]
  • URL: http://www.tagen.tohoku.ac.jp/labo/kainuma/j/