Large magnetic-field-induced strains in Ni2MnGa single crystals

Ullakko, K.; Huang, Junjie; Kantner, C.; O’Handley, R.C.; Кокорин, В. В.

doi:10.1063/1.117637

Cited by 2,583 publications

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“…T he ferromagnetic martensitic transition (FMMT) [1][2][3] , a coinciding crystallographic and magnetic transition mainly found in Fe-based and Heusler ferromagnetic alloys, is receiving increasing attention from both the magnetism and the material science community due to the massive variations of associated magnetoresponsive effects, such as magnetic-field-induced shape memory/strain effect [4][5][6][7] , magnetoresistance 8,9 , Hall effect 10 and magnetocaloric effect 11,12 . These effects are of interest for many potential technological applications like magnetic actuators 13,14 , sensors 15 , energy-harvesting devices 16 and solid-state magnetic refrigeration 17 .…”

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confidence: 99%

Stable magnetostructural coupling with tunable magnetoresponsive effects in hexagonal ferromagnets

et al. 2012

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The magnetostructural coupling between the structural and the magnetic transition has a crucial role in magnetoresponsive effects in a martensitic-transition system. A combination of various magnetoresponsive effects based on this coupling may facilitate the multifunctional applications of a host material. Here we demonstrate the feasibility of obtaining a stable magnetostructural coupling over a broad temperature window from 350 to 70 K, in combination with tunable magnetoresponsive effects, in mnniGe:Fe alloys. The alloy exhibits a magneticfield-induced martensitic transition from paramagnetic austenite to ferromagnetic martensite. The results indicate that stable magnetostructural coupling is accessible in hexagonal phasetransition systems to attain the magnetoresponsive effects with broad tunability.

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confidence: 99%

Stable magnetostructural coupling with tunable magnetoresponsive effects in hexagonal ferromagnets

et al. 2012

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“…The heating and cooling rates employed in the tests were 1K/minute. Damping was calculated from the slope of the natural logarithm of the decaying amplitudes versus period number through equation (1), such that [18]     1 0 ln ln…”

Section: Methodsmentioning

confidence: 99%

“…In fact, one of the most interesting properties is the high magnetoplasticity they show as a consequence of the magnetic field induced re-orientation of the magnetic martensitic variants. In addition, fundamental physics studies related to the coupling between structural, mechanical, magnetic and thermodynamic properties are field of intense work [1,2]. Concerning the Fe-Pd system, the face centered tetragonal (FCT) martensitic phase allows the magnetic shape memory effect by reorientation of martensite variants via twin boundary motion.…”

Section: Introductionmentioning

confidence: 99%

Influence of defects on the irreversible phase transition in the Fe-Pd doped with Co and Mn

et al. 2018

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The appearance of BCT martensite in Fe-Pd-based ferromagnetic shape memory alloys, which develops at lower temperatures than the thermoelastic martensitic transition, deteriorates the shape memory properties. In a previous work performed in Fe 70 Pd 30 , it was shown that a reduction in defects density reduces the non thermoelastic FCT-BCT transformation temperature. In the present work, the influence of quenched-indefects upon the intensity and temperature of the thermoelastic martensitic (FCC-FCT) and the non thermoelastic (FCT-BCT) transitions in Fe-Pd doped with Co and Mn is studied. Differential scanning calorimetric and mechanical spectroscopy studies demonstrate that a reduction in the dislocation density the stability range of the FCC-FCT reversible transformation in Fe 67 Pd 30 Co 3 and Fe 66.8 Pd 30.7 Mn 2.5 ferromagnetic shape memory alloys.

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“…Ni 2 MnGa belongs to this category of Heusler alloys. [1][2][3] The Heusler alloys of this category may find their application as various devices, such as actuators, antenna, sensors etc. For the application purpose it is always desired that martensitic transition temperature is above the room temperature.…”

Section: Introductionmentioning

confidence: 99%

Ab initio study of effect of Co substitution on the magnetic properties of Ni and Pt-based Heusler alloys

Roy

Chakrabarti

2017

Physics Letters A

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Using density functional theory based calculations, we have carried out in-depth studies of effect of Co substitution on the magnetic properties of Ni and Pt-based shape memory alloys. We show the systematic variation of the total magnetic moment, as a function of Co doping. A detailed analysis of evolution of Heisenberg exchange coupling parameters as a function of Co doping has been presented here. The strength of RKKY type of exchange interaction is found to decay with the increase of Co doping.

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Large magnetic-field-induced strains in Ni2MnGa single crystals

Abstract: Strains of nearly 0.2% have been induced along [001] in unstressed crystals of Ni2MnGa with magnetic fields of 8 kOe applied at 265 K. These stains are associated with the superelastic motion of twin boundaries in the martensitic phase that is stable below about 274 K.

Cited by 2,583 publications

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Stable magnetostructural coupling with tunable magnetoresponsive effects in hexagonal ferromagnets

Stable magnetostructural coupling with tunable magnetoresponsive effects in hexagonal ferromagnets

Influence of defects on the irreversible phase transition in the Fe-Pd doped with Co and Mn

Ab initio study of effect of Co substitution on the magnetic properties of Ni and Pt-based Heusler alloys

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