Magnetic moment and chemical order in off-stoichiometric Ni–Mn–Ga ferromagnetic shape memory alloys

Lázpita, P.; Barandiarán, J.M.; Gutiérrez, J.; Feuchtwanger, J.; Chernenko, V.A.; Richard, M.

doi:10.1088/1367-2630/13/3/033039

Cited by 83 publications

(55 citation statements)

References 19 publications

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“…4d), the nearest Mn (Mn Ga antisite)-Mn distance is 2.86 Å ; the antiferromagnetic coupling between the nearest Mn-Mn atoms is expected due to the variation of the exchange interaction that becomes antiferromagnetic for small interatomic distances [44]. Similar behavior of the antiferromagnetic ordering has been observed and calculated for Ni-Mn-X materials [45][46][47][48].…”

Section: Resultssupporting

confidence: 60%

Composition-dependent structural and magnetic properties of Ni–Mn–Ga alloys studied by ab initio calculations

Raulot

et al. 2015

J Mater Sci

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We have revealed the influence of composition doping (Ni 2?x Mn 1-x Ga, Ni 2?x MnGa 1-x , and Ni 2 Mn 1?x Ga 1-x ) on lattice constants and atomic magnetic moments of austenite, 7 M and NM martensite, by ab initio calculations. It is demonstrated that Ni-doping decreases the volume, whereas Mn-doping increases it. The total magnetic moment of the three series of alloys is mainly dominated by their Mn content with little phase-state dependence. The perturbation of the magnetic moments by atom substitution is mainly dominated by the Mn environment. This study is expected to provide information on composition-related structure and magnetic properties of Ni-Mn-Ga alloys that could not be obtained by experiments.

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Section: Resultssupporting

confidence: 60%

Composition-dependent structural and magnetic properties of Ni–Mn–Ga alloys studied by ab initio calculations

Raulot

et al. 2015

J Mater Sci

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“…The antiferromagnetic coupling between nearest-neighbor Mn atoms in Ni 2 (Mn 1 − y Cu y )(Ga 1 − y Mn y ) alloys is due to the variation of the exchange interaction that becomes antiferromagnetic for small Mn-Mn interatomic distances. This antiferromagnetic coupling was already proved experimentally and theoretically in many Mn-rich Ni-Mn-Ga Heusler alloys [14,[23][24][25][26][27]. Then, the μ s of Ni 2 (Mn 1 − y Cu y )(Ga 1 − y Mn y ) alloys is given by μ s (cal) = 2μ Ni + (1 − y)μ MnI + yμ Cu + (1 − y)μ Ga + yμ MnII , where μ MnI and μ MnII mean the values of the magnetic moment of the Mn atoms on the Mn sublattice and the Ga sublattice, respectively.…”

Section: Methodsmentioning

confidence: 53%

Magnetic Moment of Cu-Modified Ni2MnGa Magnetic Shape Memory Alloys

Kanomata

Endo

Kudo

et al. 2013

Metals

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Abstract:The magnetization measurements at 5 K were carried out for Ni 2 Mn 1 − x Cu x Ga (0 ≤ x ≤ 0.40) and Ni 2 MnGa 1 − y Cu y (0 ≤ y ≤ 0.25) alloys. All of the magnetization curves are characteristic of ferromagnetism or ferrimagnetism. By using Arrott plot analysis the spontaneous magnetization of all samples was determined from the magnetization curves. The magnetic moment per formula unit, μ s , at 5 K was estimated from the spontaneous

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“…A: Magnetic field influence on martensite transformation in ferromagnetic shape memory alloys and metamagnetic shape memory alloys [64][65][66][67][68][69][70]; B: Magnetic anisotropy of the ferromagnetic shape memory alloys [71,72]; C: Magnetostriction [73,74].…”

Section: Magnetic Field-induced Strain and Magnetostriction In Shape mentioning

confidence: 99%

Magneto-Structural Properties of Ni2MnGa Ferromagnetic Shape Memory Alloy in Magnetic Fields

Sakon

Adachi

Kanomata

2013

Metals

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Abstract:The purpose of this review was to investigate the correlation between magnetism and crystallographic structures as it relates to the martensite transformation of Ni 2 MnGa type alloys, which undergo martensite transformation below the Curie temperature. In particular, this paper focused on the physical properties in magnetic fields. Recent researches show that the martensite starting temperature (martensite transformation temperature) T M and the martensite to austenite transformation temperature (reverse martensite temperature) T R of Fe, Cu, or Co-doped Ni-Mn-Ga ferromagnetic shape memory alloys increase when compared to Ni 2 MnGa. These alloys show large field dependence of the martensite transformation temperature. The field dependence of the martensite transformation temperature, dT M /dB, is −4.2 K/T in Ni 41 Co 9 Mn 32 Ga 18 . The results of linear thermal strain and magnetization indicate that a magneto-structural transition occurred at T M and magnetic field influences the magnetism and also the crystal structures. Magnetocrystalline anisotropy was also determined and compared with other components of Ni 2 MnGa type shape memory alloys. In the last section, magnetic field-induced strain and magnetostriction was determined with some novel alloys. OPEN ACCESS

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Magnetic moment and chemical order in off-stoichiometric Ni–Mn–Ga ferromagnetic shape memory alloys

Cited by 83 publications

References 19 publications

Composition-dependent structural and magnetic properties of Ni–Mn–Ga alloys studied by ab initio calculations

Composition-dependent structural and magnetic properties of Ni–Mn–Ga alloys studied by ab initio calculations

Magnetic Moment of Cu-Modified Ni2MnGa Magnetic Shape Memory Alloys

Magneto-Structural Properties of Ni2MnGa Ferromagnetic Shape Memory Alloy in Magnetic Fields

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