Experimental Study of the time dependences of the martensite transition of novel Heusler alloys in pulsed and steady magnetic fields

• Project/Area Number: 24560798
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Physical properties of metals
• Research Institution: Ryukoku University
• Principal Investigator: SAKON Takuo 龍谷大学, 理工学部, 教授 (80271964)
• Co-Investigator(Renkei-kenkyūsha): ADACHI Yoshiya 山形大学, 工学部, 准教授 (60262416) ; FUJITA Asaya 産総研中部グリーン磁性材料研究センター材料解析, 開発チーム, チーム長 (10323073)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000); Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2013: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2012: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
• Keywords: 遍歴電子磁性 / 強磁場磁性 / ホイスラー合金 / 形状記憶合金 / 磁化 / 磁気熱量効果 / 示差熱量測定 / 遍歴電子系磁性体 / マルテンサイト相転移 / 強磁性 / マルテンサイト変態 / パルス磁場 / マルテンサイト / メタ磁性転移 / リエントラント強磁性 / 磁場誘起歪み

Outline of Final Research Achievements

Thermal strain, magnetostriction and magnetization measurements of Ni41Co9Mn31.5Ga18.5 polycrystalline ferromagnetic shape memory alloy (FSMA) were performed.The reverse martensite and martensite transition temperatures (TR, TM) decreased gradually with increasing magnetic field. The field dependence of the TM, dTM/dB, is －4.2 K/T and that of the TR, dTR/dB, is －7.9 K/T. The metamagnetic transition appeared between 330 K and 390 K. The results of giant hysteresis of thermal strain and magnetization indicate that a magneto-structural transition occurred at TM. The region above TM or TR is the ferromagnetic austenite phase and that below TM or TR is the paramagnetic or weak ferromagnetic martensitic phase. At constant temperature, a magnetic field-induced strain was observed with a value of 0.001, which indicates that this alloy is sensitive to magnetic fields. Strong magneto-structural coupling was revealed by the magnetic properties and phase transitions.

Research Products

• [Journal Article] Ab initiostudyof 59Co NMRspectrainCo2FeAl1 (2015)
  • Author(s): H. Nishihara, K.Sato, H.Akai, C.Takiguchi, M.Geshi, T.Kanomata, T.Sakon, T.Wada
  • Journal Title: Physica B Volume: 465 Pages: 66-70
  • DOI: 10.1016/j.physb.2015.02.018
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Magnetic Properties of the Ferromagnetic Shape Memory Alloys Ni50+xMn27－xGa23 in Magnetic Fields (2014)
  • Author(s): Takuo Sakon, Kohei Otsuka, Junpei Matsubayashi, Yuushi Watanabe, Hironori Nishihara, Kenta Sasaki, Satoshi Yamashita, Rie Y. Umetsu, Hiroyuki Nojiri, Takeshi Kanomata
  • Journal Title: Materials Volume: 7 Issue: 5 Pages: 3715-3734
  • DOI: 10.3390/ma7053715
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Magnetic phase diagram of ferromagnetic shape memory alloys Ni2MnGa1-xFex (2014)
  • Author(s): Y. Hayasaka, S. Aoto, H. Date, T. Kanomata, X. Xu, R.Y. Umetsu, M. Nagasako, T. Omori, R. Kainuma, T. Sakon, H. Nishihara, K. R. A. Ziebeck
  • Journal Title: J ALLOY COMPD Volume: 591 Pages: 280-285
  • DOI: 10.1016/j.jallcom.2013.12.035
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Magneto-Structural Properties of Ni2MnGa Ferromagnetic Shape Memory Alloy in Magnetic Fields (2013)
  • Author(s): T.Sakon, Y. Adachi, T. Kanomata
  • Journal Title: Metals Volume: 3 Issue: 2 Pages: 202-224
  • DOI: 10.3390/met3020202
  • Peer Reviewed
• [Journal Article] Thermal strainandmagnetizationoftheferromagneticshapememoryalloy Ni52Mn25Ga23 in amagneticfield (2013)
  • Author(s): T. Sakon, H.Nagashio, K.Sasaki, S.Susuga, D.Numakura, M.Abe, K.Endo, S.Yamashita, H. Nojiri, T.Kanomata
  • Journal Title: Journal of Physics and Chemistry of Solids Volume: 74 Issue: 1 Pages: 158-165
  • DOI: 10.1016/j.jpcs.2012.09.004
  • Peer Reviewed
• [Journal Article] Magnetic Field-Induced Transition in Co-Doped Ni₄₁Co₉Mn_31.5Ga_18.5 Heusler Alloy (2013)
  • Author(s): Takuo Sakon, Kenta Sasaki, Daisuke Numakura, Michihito Abe, Hiroyuki Nojiri, Yoshiya Adachi, Takeshi Kanomata
  • Journal Title: MATERIALS TRANSACTIONS Volume: 54 Issue: 1 Pages: 9-13
  • DOI: 10.2320/matertrans.M2012289
  • NAID: 130004824979
  • ISSN: 1345-9678, 1347-5320
  • Peer Reviewed
• [Journal Article] High-Field Magnetization Measurements of Fe2MnSi (2013)
  • Author(s): Takuo Sakon, Keiichi Koyama, Osamu Kamiya, Satoshi Awaji, Shintaro Nakamura, Tsutomu Nojima, Hiroyuki Nojiri, Kazuo Watanabe, Masahiko Hiroi
  • Journal Title: Journal of the Physical Society of Japan Volume: 82 Issue: 4 Pages: 044802-044802
  • DOI: 10.7566/jpsj.82.044802
  • NAID: 210000132530
  • Peer Reviewed
• [Presentation] Physical and Magnetic Properties of Magnetic Shape Memory Alloys Ni50+xMn27-xGa23 and Ni2MnGa1-xFex (2014)
  • Author(s): T. Sakon
  • Organizer: MRS2014 fall meeting
  • Place of Presentation: Boston, MA, USA
  • Year and Date: 2014-12-02
• [Presentation] Ni2MnGa Heusler type magnetic shape memory alloys (2014)
  • Author(s): T. Sakon
  • Organizer: WCAM2014
  • Place of Presentation: Chongqing, China
  • Year and Date: 2014-06-08
• [Presentation] Magnetism of Co doped NiCoMnGa Shape Memory Alloys (2014)
  • Author(s): T. Sakon
  • Organizer: World Congress of Advanced Materials-2014 (WCAM2014)
  • Place of Presentation: Chongqing, China
• [Presentation] Crystallography and Magnetic Field-Induced Strain by Co Doping NiCoMnGa Heusler Alloy (2013)
  • Author(s): Takuo Sakon, Yoshiya Adachi, Rie Umetsu, Hiroyuki Nojiri, Hironori Nishihara, Takeshi Kanomata
  • Organizer: TMS2013
  • Place of Presentation: San Antonio, Texas, USA
• [Patent(Industrial Property Rights)] 磁気アクチュエータ (2013)
  • Inventor(s): 左近 拓男
  • Industrial Property Rights Holder: 左近 拓男
  • Industrial Property Rights Type: 特許
  • Industrial Property Number: 2013-267480
  • Filing Date: 2013-12-25