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New Aspects of Structural and Magnetic Behaviour of Martensites in Ni-Mn-Ga Alloys
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Volodymyr Chernenko1), Victor L’vov2), Eduard Cesari3), Jaume Pons3), Richard Portier4) and Sergei Zagorodnyuk2)
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1) Institute of Magnetism
2) Taras Shevchenko University
3) Departament de Física, Universitat de les Illes Balears
4) CECM(CNRS), F-94497 Vitry-sur-Seine and ENSCP
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The structural changes and magnetic anomalies accompanying martensitic transformations in Ni–Mn–Ga alloys are briefly discussed. The role of lattice tetragonality of martensite in the reduction of magnetic field needed for the observation of large magnetostrain effect is theoretically analyzed, considering the compensation of the magnetic anisotropy. The possibility of the field reduction is based on the previously observed lattice parameter dependence on the temperature and proper fit of the alloy specimen shape. The model shows that a significant reduction of the magnetic field needed for the giant MSE can take place in martensites with 0.98<c⁄a<1.04.
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Keyword: nickel-manganese-gallium alloys, martensitic transformation, tetragonality of martensitic lattice, magnetostrain effect, magnetic anisotropy, phenomenological model
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Received: December 06, 2001
Accepted: February 15, 2002 ,
Published online: September 06, 2005 |
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Copyright (c) 2005 The Japan Institute of Metals |
 Reference
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