Identification of novel compositions of ferromagnetic shape-memory alloys using composition spreads

I. Takeuchi; O. O. Famodu; J. C. Read; M. A. Aronova; K. S. Chang; C. Craciunescu; S. E. Lofland; M. Wuttig; F. C. Wellstood; L. Knauss; A. Orozco

doi:10.1038/nmat829

Identification of novel compositions of ferromagnetic shape-memory alloys using composition spreads

I. Takeuchi, O. O. Famodu, J. C. Read, M. A. Aronova, K. S. Chang, C. Craciunescu, S. E. Lofland, M. Wuttig, F. C. Wellstood, L. Knauss, A. Orozco

Physics

Research output: Contribution to journal › Article › peer-review

240 Scopus citations

Abstract

Exploration of new ferroic (ferroelectric, ferromagnetic or ferroelastic) materials continues to be a central theme in condensed matter physics and to drive advances in key areas of technology. Here, using thin-film composition spreads, we have mapped the functional phase diagram of the Ni-Mn-Ga system whose Heusler composition Ni₂MnGa is a well known ferromagnetic shape-memory alloy. A characterization technique that allows detection of martensitic transitions by visual inspection was combined with quantitative magnetization mapping using scanning SQUID (superconducting quantum interference device) microscopy. We find that a large, previously unexplored region outside the Heusler composition contains reversible martensites that are also ferromagnetic. A clear relationship between magnetization and the martensitic transition temperature is observed, revealing a strong thermodynamical coupling between magnetism and martensitic instability across a large fraction of the phase diagram.

Original language	English (US)
Pages (from-to)	180-184
Number of pages	5
Journal	Nature Materials
Volume	2
Issue number	3
DOIs	https://doi.org/10.1038/nmat829
State	Published - Mar 2003

All Science Journal Classification (ASJC) codes

General Chemistry
General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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title = "Identification of novel compositions of ferromagnetic shape-memory alloys using composition spreads",

abstract = "Exploration of new ferroic (ferroelectric, ferromagnetic or ferroelastic) materials continues to be a central theme in condensed matter physics and to drive advances in key areas of technology. Here, using thin-film composition spreads, we have mapped the functional phase diagram of the Ni-Mn-Ga system whose Heusler composition Ni2MnGa is a well known ferromagnetic shape-memory alloy. A characterization technique that allows detection of martensitic transitions by visual inspection was combined with quantitative magnetization mapping using scanning SQUID (superconducting quantum interference device) microscopy. We find that a large, previously unexplored region outside the Heusler composition contains reversible martensites that are also ferromagnetic. A clear relationship between magnetization and the martensitic transition temperature is observed, revealing a strong thermodynamical coupling between magnetism and martensitic instability across a large fraction of the phase diagram.",

author = "I. Takeuchi and Famodu, {O. O.} and Read, {J. C.} and Aronova, {M. A.} and Chang, {K. S.} and C. Craciunescu and Lofland, {S. E.} and M. Wuttig and Wellstood, {F. C.} and L. Knauss and A. Orozco",

note = "Funding Information: This project was funded by ONR N000140010503 and N000140110761, NSF DMR0076456 and DMR0114176, and the New Jersey Commission on Higher Education. Correspondence and requests for materials should be addressed to I.T. Supplementary Information is available on the Nature Materials website (http://www.nature.com/naturematerials).",

year = "2003",

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doi = "10.1038/nmat829",

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AU - Takeuchi, I.

AU - Famodu, O. O.

AU - Read, J. C.

AU - Aronova, M. A.

AU - Chang, K. S.

AU - Craciunescu, C.

AU - Lofland, S. E.

AU - Wuttig, M.

AU - Wellstood, F. C.

AU - Knauss, L.

AU - Orozco, A.

N1 - Funding Information: This project was funded by ONR N000140010503 and N000140110761, NSF DMR0076456 and DMR0114176, and the New Jersey Commission on Higher Education. Correspondence and requests for materials should be addressed to I.T. Supplementary Information is available on the Nature Materials website (http://www.nature.com/naturematerials).

PY - 2003/3

Y1 - 2003/3

N2 - Exploration of new ferroic (ferroelectric, ferromagnetic or ferroelastic) materials continues to be a central theme in condensed matter physics and to drive advances in key areas of technology. Here, using thin-film composition spreads, we have mapped the functional phase diagram of the Ni-Mn-Ga system whose Heusler composition Ni2MnGa is a well known ferromagnetic shape-memory alloy. A characterization technique that allows detection of martensitic transitions by visual inspection was combined with quantitative magnetization mapping using scanning SQUID (superconducting quantum interference device) microscopy. We find that a large, previously unexplored region outside the Heusler composition contains reversible martensites that are also ferromagnetic. A clear relationship between magnetization and the martensitic transition temperature is observed, revealing a strong thermodynamical coupling between magnetism and martensitic instability across a large fraction of the phase diagram.

AB - Exploration of new ferroic (ferroelectric, ferromagnetic or ferroelastic) materials continues to be a central theme in condensed matter physics and to drive advances in key areas of technology. Here, using thin-film composition spreads, we have mapped the functional phase diagram of the Ni-Mn-Ga system whose Heusler composition Ni2MnGa is a well known ferromagnetic shape-memory alloy. A characterization technique that allows detection of martensitic transitions by visual inspection was combined with quantitative magnetization mapping using scanning SQUID (superconducting quantum interference device) microscopy. We find that a large, previously unexplored region outside the Heusler composition contains reversible martensites that are also ferromagnetic. A clear relationship between magnetization and the martensitic transition temperature is observed, revealing a strong thermodynamical coupling between magnetism and martensitic instability across a large fraction of the phase diagram.

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Identification of novel compositions of ferromagnetic shape-memory alloys using composition spreads

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