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

来源：

NATURE MATERIALS | 2003年 / 2卷 / 03期

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

页码：180 / 184

页数：5

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