Ferromagnetic shape memory in the NiMnGa system

被引:192
作者
Tickle, R [1 ]
James, RD
Shield, T
Wuttig, M
Kokorin, VV
机构
[1] Univ Minnesota, Dept Aerosp Engn & Mech, Minneapolis, MN 55455 USA
[2] Univ Maryland, Dept Mat & Nucl Engn, College Pk, MD 20742 USA
[3] Inst Magnetism, UA-252680 Kiev, Ukraine
基金
美国国家科学基金会;
关键词
cubic-to-tetragonal transformation; ferromagnetic shape memory; giant magnetostrictive materials; magnetomechanical properties;
D O I
10.1109/20.799080
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Strain versus field measurements for a ferromagnetic shape memory alloy in the NiMnGa system demonstrate the largest magnetostrictive strains to date of nearly 1.3%. These strains are achieved in the martensitic state through field-induced variant rearrangement, An experimental apparatus is described that provides biaxial magnetic fields and uniaxial compressive prestress with temperature control while recording microstructural changes with optical microscopy, The magnetostrictive response is found to be sensitive to the initial state induced by stress-biasing the martensitic variant structure, and exhibits rate effects related to twin boundary mobility. Experiments performed with constant stress demonstrate work output capacity, Experimental results are interpreted by using a theory based on minimization of a micromagnetic energy functional that includes applied field, stress, and demagnetization energies, It is found that the theory provides a good qualitative description of material behavior, but significantly overpredicts the amount of strain produced. Issues concerning the martensitic magnetic anisotropy and variant nucleation are discussed with regard to this discrepancy.
引用
收藏
页码:4301 / 4310
页数:10
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