Journal ArticleDOI
Giant magnetic-field-induced strain in NiMnGa seven-layered martensitic phase
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TLDR
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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Magnetic coercivity control by heat treatment in Heusler Ni-Mn-Ga(-B) single crystals
TL;DR: In this paper, the authors found that increasing the density of thermal antiphase boundaries (APBs) provides a method to increase the magnetic coercivity without deteriorating the magnetic shape memory functionality.
Journal ArticleDOI
Understanding the Magnetic Shape Memory System Fe–Pd–X by Thin Film Experiments and First Principle Calculations
Sandra Kauffmann-Weiss,S. Hamann,Markus E. Gruner,Jörg Buschbeck,Alfred Ludwig,Ludwig Schultz,Sebastian Fähler +6 more
TL;DR: The magnetic shape memory (MSM) alloy Fe70Pd30 is of particular interest for novel microactuator and sensor applications as mentioned in this paper, and a review summarizes the underlying physical and material science concepts for this MSM alloy system.
Journal ArticleDOI
Correlation of phase transformations and magnetic properties in annealed epitaxial Fe–Pd magnetic shape memory alloy films
TL;DR: In this article, a heat treatment was applied to pulsed laser-deposition, partial epitaxial Fe-Pd films with different compositions to obtain single-crystal-like films.
Journal ArticleDOI
Differently mobile twin boundaries and magnetic shape memory effect in 10 M martensite of Ni–Mn–Ga
TL;DR: In this paper, twin boundaries with sharply different mobility or twinning stress in five-layered modulated (10-M) martensite of Ni-Mn-Ga exhibiting magnetic shape memory effect or magnetically induced reorientation were investigated.
Journal ArticleDOI
Enhanced field induced martensitic phase transition and magnetocaloric effect in Ni55Mn20Ga25 metallic foams
TL;DR: In this paper, the porous structure of Ni 54.8 Mn 20.2 Ga 25.0 open-cells metallic foams (porosity varying between 44% and 58%) was demonstrated to reduce the temperature span of the phase transition and increase the magnetocaloric effect (MCE).
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.
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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.