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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Jahn-Teller like origin of the tetragonal distortion in disordered Fe-Pd magnetic shape memory alloys
TL;DR: In this paper, the electronic structure and magnetic properties of disordered Fe-Pd alloys were investigated in the framework of density functional theory using the full potential local orbital method (FPLO).
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Magneto-structural transformation studies in melt-spun Ni–Mn–Ga ribbons
N.V. Rama Rao,Raghavan Gopalan,M. Manivel Raja,J. Arout Chelvane,Bhaskar Majumdar,V. Chandrasekaran +5 more
TL;DR: In this article, the magneto-structural transformation characteristics in melt-spun ribbons of ferromagnetic Ni-Mn-Ga Heusler-type alloys were investigated.
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Electronic structure and possible martensitic transformation in Mn2NiGe and Ni2MnGe
Hongzhi Luo,Hongzhi Luo,Fanbin Meng,Guodong Liu,Heyan Liu,Pengzhong Jia,Enke Liu,Wenhong Wang,Guangheng Wu +8 more
TL;DR: In this article, the electronic structure and magnetism of Heusler alloys Mn2NiGe and Ni2MnGe have been studied by first-principles calculations and the possible nonmodulated tetragonal martensitic transformation in them has been predicted.
Journal ArticleDOI
Hydrostatic pressure effect on the martensitic transition, magnetic, and magnetocaloric properties in Ni50-xMn37+xSn13 Heusler alloys
S. Esakki Muthu,N.V. Rama Rao,M. Manivel Raja,Sonachalam Arumugam,K. Matsubayasi,Yoshiya Uwatoko +5 more
TL;DR: In this article, the effect of hydrostatic pressure on the martensitic transition, magnetic properties, and magnetic entropy change in Ni50-xMn37 + xSn13 (x = 2, 3) Heusler alloys was reported.
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Rearrangement of variants in Ni2MnGa under magnetic field
TL;DR: Magnetic field-induced strain which appears in association with rearrangement of variants in a stoichiometric Ni2MnGa single crystal exhibiting a martensitic transformation at 202 K has been investigated in this article.
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.