Journal ArticleDOI
Giant magnetic-field-induced strain in NiMnGa seven-layered martensitic phase
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In this paper, a magnetic-field-induced strain of about 9.5% was observed at ambient temperature in a magnetic field of less than 1 T in NiMnGa orthorhombic seven-layered martensitic phase.Abstract:
Giant magnetic-field-induced strain of about 9.5% was observed at ambient temperature in a magnetic field of less than 1 T in NiMnGa orthorhombic seven-layered martensitic phase. The strain proved to be caused by magnetic-field-controlled twin boundary motion. According to an analysis of x-ray diffraction data, the crystal structure of this phase is nearly orthorhombic, having lattice parameters a=0.619 nm, b=0.580 nm, and c=0.553 nm (in cubic parent phase coordinates) at ambient temperature. Seven-layer shuffling-type modulation along the (110)[110]p system was recorded. The results of mechanical tests and magnetic anisotropy property measurements are also reported.read more
Citations
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Ni-Mn-Ga microwire twist caused by stress-magnetic coupling
TL;DR: In this article, a new kind of magneto-mechanical effect of Ni-Mn-Ga microwire is explored by combining stress field-induced twist (SFIT) with magnetic field induced twist (MFIT) under the condition of stress-magnetic coupling.
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The effect of Fe doping on the crystallization kinetics of Ni-Mn-Sn free-standing alloy thin films
TL;DR: In this paper, the effect of Fe doping on the crystallization kinetics of Ni-Mn-Sn free-standing alloy thin films was investigated by differential scanning calorimetry (DSC) in the mode of non-isothermal and isothermal conditions.
Journal ArticleDOI
A first principles study of iron doping in Ni2CoGa magnetic shape memory alloy
A. Tavana,L. Mikaeilzadeh +1 more
TL;DR: In this paper, first principles calculations have been performed for the Ni2Co1-xFexGa Heusler compound in order to investigate the nature of structural instability and the effect of iron doping in enhancing the magneto-structural properties.
Journal ArticleDOI
Microstructural, phase transformation and magnetic properties of Ni—Mn—Ga alloy fabricated by spark plasma sintering
TL;DR: In this article, the microstructural, phase transformation and magnetic properties of Ni-Mn-Ga alloy fabricated using the spark plasma sintering method have been investigated and the results show that both the as-sintered and annealed sintered specimens exhibit typical martensitic transformation behaviours.
Journal ArticleDOI
The phase diagrams of Ni-Mn-Ga alloys in the magnetic field
Vasiliy D. Buchelnikov,Sergey Taskaev,Mikhail A. Zagrebin,D.I. Ermakov,V. V. Koledov,Vladimir G. Shavrov,Toshiyuki Takagi +6 more
TL;DR: In this article, the Ginzburg-Landau theory is applied to the temperature-magnetic field phase diagrams of Heusler alloys Ni-Mn-Ga and the influence of the parameters of the magnetoelastic constants and elastic moduli on the phase diagrams is discussed.
References
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Journal ArticleDOI
Large magnetic‐field‐induced strains in Ni2MnGa single crystals
TL;DR: In this paper, the superelastic motion of twin boundaries in the martensitic phase of Ni2MnGa with magnetic fields of 8 kOe applied at 265 K was found to be associated with the staining.
Journal ArticleDOI
6% magnetic-field-induced strain by twin-boundary motion in ferromagnetic Ni–Mn–Ga
TL;DR: In this paper, a simple model accounts quantitatively for the dependence of strain on magnetic field and external stress using as input parameters only measured quantities, and the strain versus field curves exhibit appreciable hysteresis associated with the motion of the twin boundaries.
Journal ArticleDOI
Magnetostriction of martensite
Richard D. James,Manfred Wuttig +1 more
TL;DR: In this article, a general strategy for inducing magnetostriction in ferromagnetic martensitic materials is described, and an analysis of domain redistribution caused by a magnetic field is given.
Journal ArticleDOI
Model for strain and magnetization in magnetic shape-memory alloys
TL;DR: In this paper, a simple phenomenological model for the magnetization process and field-induced strain by twin-boundary and phaseboundary motion is proposed for both the strong and weak anisotropy cases.
Journal ArticleDOI
Crystal structure of martensitic phases in Ni–Mn–Ga shape memory alloys
TL;DR: The crystal structures of the different martensitic phases observed in a wide variety of Ni-Mn-Ga alloy compositions have been studied in detail as discussed by the authors, and two approaches taken from the literature are analysed and discussed.