Magnetic-field-induced twin boundary motion in magnetic shape-memory alloys

Chopra, Harsh Deep; Ji, Chunhai; Кокорин, В. В.

doi:10.1103/physrevb.61.r14913

Cited by 134 publications

(72 citation statements)

References 10 publications

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“…There are several FSMAs available at the present moment, and they are Heusler-type Ni 2 MnGa-based, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] Fe-Ni-CoTi, 17) Fe-$30 at%Pd [18][19][20][21] and Fe-25 at%Pt 19) and Fe-Pt-Pd. 22) Among FSMAs, Ni 2 Mn-Ga-based alloys are particularly interesting in part because such alloys have extensively been studied recently to try to understand features related to SME and its related phase transformation behavior with and without magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Effect of Magnetic Field on Deformation Properties in Ferromagnetic Ni2MnGa Shape Memory Alloy

et al. 2004

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Ferromagnetic shape memory alloy Ni-25 at%Mn-23 at%Ga prepared by melting in an electric furnace was investigated to study compression properties at various temperatures with and without magnetic field. The magnetic field is applied parallel to the compression axis at a temperature below martensite finish temperature and at a temperature above austenite finish temperature. Triggering stress necessary for rearrangement of martensite variants is reduced by 0:76$1:68 MPa (i.e., 2:5$5:5%) when a magnetic field of 0:4$0:6 T is applied to martensite state. The stress reduction is larger at a higher magnetic field. On the other hand, triggering stress for stress-induced martensite transformation is essentially unchanged under the same magnetic field applied to austenite state. This is due in part to very small changes in Gibbs free energy under magnetic field because of large temperature differences between M s and T c . and because of essentially no difference in magnetization between martensite and austenite phases.

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Section: Introductionmentioning

confidence: 99%

Effect of Magnetic Field on Deformation Properties in Ferromagnetic Ni2MnGa Shape Memory Alloy

et al. 2004

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“…O Handley proposed a simple phenomenological model for the magnetization process and eld-induced strain by twin-boundary and phase-boundary motion for both the strong and weak anisotropy cases 4) . Chopra et al gave the direct evidence of microscopic rearrangement of twin domain by twin wall motion, which leads to the observed macroscopic strain in magnetic shape memory alloys (SMA) in an applied magnetic eld 5) . Pan et al also investigated the domain and twin structure in the martensitic phase using magnetic force microscopy 6) .…”

Section: Introductionmentioning

confidence: 99%

Ab-Initio Study of Electronic Structure of Martensitic Twin Boundary in Ni2MnGa Alloy

2016

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The electronic structure of (110) and (011) martensitic twin boundary in Ni 2 MnGa alloys has been calculated by using ab initio method within the density-functional theory (DFT) and the supercell implementation. The calculated results show that the energy for the (110) twin boundary is larger than that for another twin due to their difference in the chemical decomposition and crystal structure. The atomic relaxation lowers the interface energies for both (110) and (011) twins and this kind of energy is still positive after relaxation. The structural stability and the magnetic properties of the twining interface are investigated and compared with each other from the total and spin density of states under atom-relaxation and -unrelaxation. The atoms such as Ni and Mn have different magnetic moments in the two kinds of twin boundaries. The total charge density on the plane passing through the twin plane gives the direct explanations of the bonding between atoms.

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“…Field and temperature dependant evolution of micromagnetic structures have been studied in detail by many authors with diverse techniques. Bitter decoration with a DIC technique was employed to unravel this evolution of magnetic and twin domains [7,8] and a visual evidence for its magneto-elastic coupling [9]. Lorentz microscopy has revealed a clear herring bone martensitic domain structures and stripe domains that are attributed to the orientation of the easy axis of the magnetization with respect to the sample surface [10].…”

Section: Introductionmentioning

confidence: 99%

Domain Structures across the Martensitic Transformation in Ni2+xMn1-xGa

Jain

Banik

Chandra

et al. 2009

MSF

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Magnetic-field-induced twin boundary motion in magnetic shape-memory alloys

Cited by 134 publications

References 10 publications

Effect of Magnetic Field on Deformation Properties in Ferromagnetic Ni<SUB>2</SUB>MnGa Shape Memory Alloy

Effect of Magnetic Field on Deformation Properties in Ferromagnetic Ni<SUB>2</SUB>MnGa Shape Memory Alloy

<i>Ab-Initio</i> Study of Electronic Structure of Martensitic Twin Boundary in Ni<sub>2</sub>MnGa Alloy

Domain Structures across the Martensitic Transformation in Ni<sub>2+x</sub>Mn<sub>1-x</sub>Ga

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