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Article: Abstract







Nature Materials 2, 180–184 (2003)





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





I. TAKEUCHI1, 2, 3, O.O. FAMODU1, J.C. READ2, M.A. ARONOVA2, K.-S. CHANG1, C. CRACIUNESCU1, S.E. LOFLAND4, M. WUTTIG1, F.C. WELLSTOOD2, L. KNAUSS5 & A. OROZCO5

1 Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA

2 Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742, USA

3 Small Smart Systems Center, University of Maryland, College Park, Maryland 20742, USA

4 Department of Chemistry and Physics, Rowan University, Glassboro, New Jersey 08028, USA

5 Neocera, Inc., 10000 Virginia Manor Road, Beltsville, Maryland 20705, USA



Correspondence to: I. TAKEUCHI [email protected]



Nature Materials AOP Published online: 2 February 2003 | doi:10.1038/nmat829













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.

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