| Issue |
J. Phys. IV France
Volume 112, October 2003
|
|
|---|---|---|
| Page(s) | 955 - 958 | |
| DOI | https://doi.org/10.1051/jp4:20031039 | |
J. Phys. IV France 112 (2003) 955
DOI: 10.1051/jp4:20031039
10% magnetic-field-induced strain in Ni-Mn-Ga seven-layered martensite
A. Sozinov1, A.A. Likhachev2, N. Lanska2, K. Ullakko2 and V.K. Lindroos11 Helsinki University of Technology, Laboratory of Physical Metallurgy and Materials Science, P.O. Box 6200, 02015 Hut, Finland
2 Helsinki University of Technology, Laboratory of Biomedical Engineering, P.O. Box 2200, 02015 Hut, Finland
Abstract
Magnetic-field-induced strain of approximately 10% is reported in Ni
48.8Mn
29.7Ga
21.5 alloy at ambient temperature in a magnetic field of the order of 1
T. It was confirmed by different experimental methods that the strain is contributed by twin boundary motion. The crystal structure
of thermally-induced martensitic phase in this alloy was found to be close to orthorhombic one in temperature range from 245 K
to 333 K. The lattice parameters are
a=0.
619 nm,
b=0.580 nm,
c=0.553 nm (relating to the cubic parent phase coordinates) at ambient temperature. Detailed x-ray study revealed seven-layer modulation
along the (110) [ 1
0]
, system. The results of mechanical tests and magnetic anisotropy property measurements are also reported. The necessary conditions
for the observation of a giant magnetic field-induced strain in non-stoichiometric Ni
2MnGa alloys based on the new experimental data are discussed.
© EDP Sciences 2003