Magnetic anisotropy of nonmodulated Ni-Mn-Ga martensite revisited

被引：38
作者：
Heczko, Oleg [1 ]
Straka, Ladislav [2 ]
Novak, Vaclav [1 ]
Faehler, Sebastian [3 ]
机构：
[1] ASCR, Inst Phys, Prague 18202, Czech Republic
[2] Helsinki Univ Technol, Lab Engn Mat, FIN-02015 Espoo, Finland
[3] IFW Dresden, D-01171 Dresden, Germany
来源：
JOURNAL OF APPLIED PHYSICS | 2010年 / 107卷 / 09期
关键词：
SHAPE-MEMORY ALLOY; SINGLE-CRYSTALS; AB-INITIO; NI2MNGA; STRAIN; MOTION; PHASES;
D O I：
10.1063/1.3357409
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Magnetic anisotropy of single crystal Ni(50.5)Mn(30.4)Ga(19.1) having nonmodulated (NM) martensite structure (c=0.660 nm and b=a=0.547 nm at room temperature) was determined in the range of 10-300 K. The single variant microstructure needed for proper anisotropy determination was prepared by 40 MPa tensile stress in comparison with previous measurements where detwinned microstructure was obtained by compression. The tensile stress process yield the single variant microstructure with easy plane magnetic anisotropy and negligible second anisotropy constant in contrast of two anisotropy constants of the same order for compressed sample. The absolute value of anisotropy constant increases from 2.6 x 10(5) J/m(3) at 300 K to 5 x 10(5) J/m(3) at 10 K. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3357409]
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页数：3
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