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

被引:221
作者
Takeuchi, I [1 ]
Famodu, OO
Read, JC
Aronova, MA
Chang, KS
Craciunescu, C
Lofland, SE
Wuttig, M
Wellstood, FC
Knauss, L
Orozco, A
机构
[1] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA
[2] Univ Maryland, Dept Phys, Ctr Superconduct Res, College Pk, MD 20742 USA
[3] Univ Maryland, Small Smart Syst Ctr, College Pk, MD 20742 USA
[4] Rowan Univ, Dept Chem & Phys, Glassboro, NJ 08028 USA
[5] Neocera Inc, Beltsville, MD 20705 USA
基金
美国国家科学基金会;
关键词
D O I
10.1038/nmat829
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
收藏
页码:180 / 184
页数:5
相关论文
共 27 条
[1]   Phase stability of martensitic structures [J].
Ahlers, M .
JOURNAL DE PHYSIQUE IV, 1995, 5 (C8) :71-80
[2]  
BOZORTH RM, 1993, FERROMAGNETISM, V317
[3]   Compositional instability of β-phase in Ni-Mn-Ga alloys [J].
Chernenko, VA .
SCRIPTA MATERIALIA, 1999, 40 (05) :523-527
[4]   THE DEVELOPMENT OF NEW FERROMAGNETIC SHAPE-MEMORY ALLOYS IN NI-MN-GA SYSTEM [J].
CHERNENKO, VA ;
CESARI, E ;
KOKORIN, VV ;
VITENKO, IN .
SCRIPTA METALLURGICA ET MATERIALIA, 1995, 33 (08) :1239-1244
[5]   Thermoelastic stress-induced thin film martensites [J].
Craciunescu, C ;
Li, H ;
Wuttig, M .
SCRIPTA MATERIALIA, 2003, 48 (01) :65-70
[6]   Closed-cycle refrigerator-cooled scanning SQUID microscope for room-temperature samples [J].
Fleet, EF ;
Chatraphorn, S ;
Wellstood, FC ;
Knauss, LA ;
Green, SM .
REVIEW OF SCIENTIFIC INSTRUMENTS, 2001, 72 (08) :3281-3290
[7]   Soft tetragonal distortions in ferromagnetic Ni2MnGa and related materials from first principles -: art. no. 134407 [J].
Godlevsky, VV ;
Rabe, KM .
PHYSICAL REVIEW B, 2001, 63 (13)
[8]  
Hill NA, 2002, J MAGN MAGN MATER, V242, P976
[9]   Magnetostriction of martensite [J].
James, RD ;
Wuttig, M .
PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 1998, 77 (05) :1273-1299
[10]   Martensitic transformation and shape memory behavior in sputter-deposited TiNi-base thin films [J].
Miyazaki, S ;
Ishida, A .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1999, 273 :106-133