Ferromagnetic shape memory alloys: Alternatives to Ni–Mn–Ga

Pons, J.; Cesari, E.; Seguı́, C.; Masdeu, F.; Santamarta, R.

doi:10.1016/j.msea.2007.02.152

Cited by 136 publications

(87 citation statements)

References 135 publications

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“…A net MFIS of 5400 ppm was induced when a 0.8 MA/m applied field was rotated from the [100] to the [001] directions of the sample. Furthermore, MFISs of 6-10 × 10 3 ppm have been reported in single crystals of Ni 2 MnGa near or below room temperature [10]. Some studies have also been conducted on the influence of Fe addition into Ni-Mn-Ga alloys around room temperature [11,12].…”

Section: Magnetostriction and Magnetic Field-induced Strain Of Ferroamentioning

confidence: 99%

Magnetostriction of Ni2Mn1−xCrxGa Heusler Alloys

Sakon

Fujimoto

Kanomata

et al. 2017

Metals

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Among the functionalities of magnetic Heusler alloys, magnetostriction is attracting considerable attention. The alloy Ni 2 MnGa has a premartensite phase, which is a precursor state to the martensitic transition. Some researchers have observed magnetostriction in this alloy in the premartensite phase. We performed magnetostriction studies on the premartensite phase of related Cr-substituted Ni 2 Mn 1−x Cr x Ga alloys and measured the thermal strain, permeability, magnetisation, and magnetostriction of polycrystals. Our thermal expansion measurements show an anomaly that indicates the occurrence of lattice deformation below the premartensitic transition temperature T P . Our permeability measurements also showed an anomaly at the premartensitic transition. From our magnetisation results, we obtained the magnetic-anisotropy constant K 1 . In the martensite phase, we found that the magnetic-anisotropy constant of the x = 0.00 alloy is larger than that of the x = 0.15 alloy. At 0.24 MA/m, we obtained a magnetostriction of −120 ppm for the x = 0.15 alloy. Magnetostriction in the premartensite phase is larger than that in the austenite and martensite phases at low magnetic-field strength, thus indicating that it is related to lattice softening in the premartensite phase. The e/a is proportional to the magnetostriction and T P , which indicates that the electron energy, the magnetostriction, and the T p are correlative each other.

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Section: Magnetostriction and Magnetic Field-induced Strain Of Ferroamentioning

confidence: 99%

Magnetostriction of Ni2Mn1−xCrxGa Heusler Alloys

Sakon

Fujimoto

Kanomata

et al. 2017

Metals

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“…FSMAs are therefore being visualised as better candidates for developing miniaturized magnetic actuators, but the extreme brittleness of some of the most promising FSMA compositions is a matter of concern [3,4,5,6,7]. FSMAs are magnetoelastic multiferroic materials exhibiting ferromagnetic and ferroelastic (martensitic) phase transitions with characteristic transition temperatures T C and T M , respectively, with a very strong coupling between the magnetic and ferroelastic order parameters [8].…”

Section: Introductionmentioning

confidence: 99%

High-resolution synchrotron x-ray powder diffraction study of the incommensurate modulation in the martensite phase ofNi2MnGa: Evidence for nearly 7M modulation and phason broadening

et al. 2014

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The modulated structure of the martensite phase of Ni 2 MnGa is revisited using high resolution synchrotron x-ray powder diffraction (SXRPD) measurements, which reveals higher order satellite reflections up to the 3 rd order and phason broadening of the satellite peaks. The structure refinement, using the (3+1) dimensional superspace group approach, shows that the modulated structure of Ni 2 MnGa can be described by orthorhombic superspace group 2

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“…Fe-Pt, Fe-Pd, Ni-Mn-Ga, Ni-Mn-Al, NiFe-Ga, Co-Ni-Al, Co-Ni-Ga etc. 13,14 exhibit this phenomenon, however Ni-Mn-Ga system has gained considerable importance in recent years due to its large values of magnetic field induced strains (MFIS) at room temperature. Among the different classes of active materials like magnetostrictive, piezoelectric and conventional shape memory, each class has its advantages and drawbacks and therefore its own area of application.…”

Section: Introductionmentioning

confidence: 99%