Magnetic and magnetomechanical properties of Ni2MnGa

Tickle, R.S.; James, Richard D.

doi:10.1016/s0304-8853(99)00292-9

Cited by 464 publications

(222 citation statements)

References 10 publications

Supporting

Mentioning

211

Contrasting

Order By: Relevance

“…24,25 However, in these alloys, the ferromagnetic state in the martensitic phase has a higher magnetization than in the austenitic phase, and T C M is always greater than T C A . A feature that particularly stands out in the M͑T͒ data of the x = 0.15 and 0.13 samples is the pronounced increase in the splitting between the ZFC and FC M͑T͒ curves in the FM martensitic state as opposed to the weak splitting in the FM austenitic state.…”

Section: Discussionmentioning

confidence: 99%

Martensitic transitions and the nature of ferromagnetism in the austenitic and martensitic states ofNi−Mn−Snalloys

et al. 2005

View full text Add to dashboard Cite

Structural and magnetic transformations in the Heusler-based system Ni 0.50 Mn 0.50−x Sn x are studied by x-ray diffraction, optical microscopy, differential scanning calorimetry, and magnetization. The structural transformations are of austenitic-martensitic character. The austenite state has an L2 1 structure, whereas the structures of the martensite can be 10M, 14M, or L1 0 depending on the Sn composition. For samples that undergo martensitic transformations below and around room temperature, it is observed that the magnetic exchange in both parent and product phases is ferromagnetic, but the ferromagnetic exchange, characteristic of each phase, is found to be of different strength. This gives rise to different Curie temperatures for the austenitic and martensitic states.

show abstract

Section: Discussionmentioning

confidence: 99%

Martensitic transitions and the nature of ferromagnetism in the austenitic and martensitic states ofNi−Mn−Snalloys

et al. 2005

View full text Add to dashboard Cite

show abstract

“…Such small coercive fields have been reported for other Ni-Mn-Ga alloys. 14,31 The saturation field is 1 T and the saturation moment is 1 µ B /f.u. M(T ) at low field gives T C = 330 K (arrow, Fig.…”

Section: B Experimental Studiesmentioning

confidence: 99%

Theoretical prediction and experimental study of a ferromagnetic shape memory alloy:Ga2MnNi

et al. 2008

View full text Add to dashboard Cite

We predict the existence of a new ferromagnetic shape memory alloy Ga 2 MnNi using density functional theory. The martensitic start temperature (T M ) is found to be approximately proportional to the stabilization energy of the martensitic phase (δE tot ) for different shape memory alloys. Experimental studies performed to verify the theoretical results show that Ga 2 MnNi is ferromagnetic at room temperature and the T M and T C are 780 K and 330 K, respectively. Both from theory and experiment, the martensitic transition is found to be volume conserving that is indicative of shape memory behavior.

show abstract

“…and the total energy balance (46) with (51), as well as the electro-magnetomechanical energy balance (49) integrated over I , hold.…”

Section: Weak Solutionsmentioning

confidence: 99%

“…In these materials, large strains are attained by variant rearrangement. In ferromagnetic shape-memory alloys, variant rearrangement can be induced through an external magnetic field [23,27,45,46]. This makes ferromagnetic shapememory alloys potential candidates for smart materials, but also renders their mathematical modeling a non-trivial task, because of the complex interplay between martensitic and ferromagnetic microstructures.…”

Section: Introductionmentioning

confidence: 99%

Phase Transformations in Electrically Conductive Ferromagnetic Shape-Memory Alloys, Their Thermodynamics and Analysis

Roubíček

Tomassetti

2013

Arch Rational Mech Anal

View full text Add to dashboard Cite

We derive a thermodynamically consistent general continuum-mechanical model describing mutually coupled martensitic and ferro/paramagnetic phase transformations in electrically-conductive magnetostrictive materials such as NiMnGa. We use small-strain and eddy-current approximations, yet large velocities and electric current injected through the boundary are allowed. Fully nonlinear coupling of magneto-mechanical and thermal effects is considered. The existence of energy-preserving weak solutions is proved by showing convergence of timediscrete approximations constructed by a carefully designed semi-implicit regularized scheme.

show abstract

Magnetic and magnetomechanical properties of Ni2MnGa

Cited by 464 publications

References 10 publications

Martensitic transitions and the nature of ferromagnetism in the austenitic and martensitic states ofNi−Mn−Snalloys

Martensitic transitions and the nature of ferromagnetism in the austenitic and martensitic states ofNi−Mn−Snalloys

Theoretical prediction and experimental study of a ferromagnetic shape memory alloy:Ga2MnNi

Phase Transformations in Electrically Conductive Ferromagnetic Shape-Memory Alloys, Their Thermodynamics and Analysis

Contact Info

Product

Resources

About