Combinatorial Investigation of Ferromagnetic Shape-Memory Alloys in the Ni-Mn-Al Ternary System Composition Spread Technique

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  • Famodu Olugbenga O.
    Small Smart Systems Center, Department of Materials Science and Engineering, University of Maryland
  • Hattrick-Simpers Jason
    Small Smart Systems Center, Department of Materials Science and Engineering, University of Maryland
  • Aronova Maria
    Center for Superconductivity Research, Department of Physics, University of Maryland
  • Chang Kao-Shuo
    Small Smart Systems Center, Department of Materials Science and Engineering, University of Maryland
  • Murakami Makoto
    Small Smart Systems Center, Department of Materials Science and Engineering, University of Maryland
  • Wuttig Manfred
    Small Smart Systems Center, Department of Materials Science and Engineering, University of Maryland
  • Okazaki Teiko
    Faculty of Science and Technology, Hirosaki University
  • Furuya Yasubumi
    Faculty of Science and Technology, Hirosaki University
  • Knauss Lee A.
    Neocera, Inc.
  • Bendersky Leonid A.
    Materials Science and Engineering Laboratory, National Institute of Standards and Technology (NIST)
  • Biancaniello Frank. S.
    Materials Science and Engineering Laboratory, National Institute of Standards and Technology (NIST)
  • Takeuchi Ichiro
    Small Smart Systems Center, Department of Materials Science and Engineering, University of Maryland Center for Superconductivity Research, Department of Physics, University of Maryland

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  • Combinatorial Investigation of Ferromagnetic Shape-Memory Alloys in the Ni-Mn-Al Ternary System Using a Composition Spread Technique

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Using a thin-film composition spread technique, we have mapped the phase diagram of the Ni-Mn-Al ternary system in search of ferromagnetic shape-memory alloys (FMSA). A characterization technique that allows detection of martensitic transitions by visual inspection using micromachined cantilever arrays was combined with quantitative magnetization mapping using scanning superconducting quantum interference device (SQUID) microscopy. A large compositional region in the Al deficient part of the phase diagram was found to be ferromagnetic and reversibly martensitic at room temperature. In addition, in the Al rich region, a new compositional range that displays marked ferromagnetism was found.

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