Magnetic properties and large magnetic-field-induced strains in off-stoichiometric Ni–Mn–Al Heusler alloys

Fujita, Akira; Fukamichi, K.; Gejima, Fumihiko; Kainuma, R.; Ishida, K.

doi:10.1063/1.1323552

Cited by 224 publications

(98 citation statements)

References 14 publications

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“…Therefore, in the past few years, there has been more research invested in the search for materials exhibiting the MSM effect and having more favorable mechanical properties at the same time. Over the past few years, other MSM alloys, such as Fe-Pt, 8 Fe-Pd, 9 CoNi-Al, 10 Co-Ni-Ga, 11 Fe-Ni-Ga, 12 and Ni-Mn-Al, [13][14][15][16] have been encountered.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2005

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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.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2005

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“…This article reports results on Ni-Mn-Al alloys, which are potential candidates to exhibit giant magnetic field induced strains. 3 These magnetic induced strains occur in ferromagnetic systems undergoing a martensitic transformation. They originate from the reorientation of martensite domains promoted by the difference in the Zeeman energy.…”

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confidence: 99%

Magnetic properties and martensitic transition in annealed Ni50Mn30Al20

Mañosa¹,

Planes²,

Acet³

et al. 2003

Journal of Applied Physics

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We have studied the effect of heat treatment on the magnetic properties and on the martensitic transition of the Ni 50 Mn 30 Al 20 alloy. A mixed L2 1 ϩB2 state is obtained in the as-prepared sample, while no L2 1 order is retained in the sample quenched from high temperature. For the two heat treatments, the samples order antiferromagnetically, but there is evidence of coexisting ferromagnetic interactions. A martensitic transition occurs below the magnetic one for quenched samples. However, the martensitic transition is inhibited in the as-prepared sample. © 2003 American Institute of Physics. ͓DOI: 10.1063/1.1555977͔ Magnetic alloys undergoing structural transitions have received much attention due to the peculiar properties arising from the coupling between structure and magnetism. Among them, magnetic field induced strains 1 and magnetocaloric effect 2 are of particular interest due to their potential application as sensors and actuators and as magnetic refrigerators. This article reports results on Ni-Mn-Al alloys, which are potential candidates to exhibit giant magnetic field induced strains. 3 These magnetic induced strains occur in ferromagnetic systems undergoing a martensitic transformation. They originate from the reorientation of martensite domains promoted by the difference in the Zeeman energy. 4 Currently, the only alloy which has shown giant ͑up to 10%͒ deformations 5 is the Ni-Mn-Ga alloy, for compositions close to the stoichiometric Ni 2 MnGa. However, the brittelness of this alloy has prompted the research of alternative materials.It was established 6,7 that for Ni-Mn-Ga, the phase stability is controlled by the average number of valence electrons per atom. In Fig. 1 we compare the phase diagram of Ni-Mn-Al to that of Ni-Mn-Ga. It is assumed that the number of valence electrons per atom for Ni, Mn, Ga, and Al atoms are 10 (3d 8 4d 2 ), 7 (3d 5 4s 2 ), 3 (4s 2 4p 1 ), and 3 (3s 2 3p 1 ), respectively. The phase diagram of Ni-Mn-Al agrees with the restricted data previously published. 8 From the figure it is clear that for this alloy, the stability of the different phases is controlled by the valence electron concentration as occurs with Ni-Mn-Ga. The phase diagrams of the two alloy systems exhibit a number of general trends. At high temperatures the alloys exhibit a nearest-neighbors ordered structure, B2 ͑Pm3m͒, and upon cooling, next-nearest neighbors order, L2 1 (Fm3m) is expected to develop. For Ni-Mn-Al, the transition line for this order-disorder transition is located at temperatures significantly lower than for Ni-Mn-Ga. This results in a very slow kinetics for the ordering process, and recent studies on a stoichiometric compound 9 have shown that long time annealings just below the order-disorder line do not stabilize a single L2 1 phase, but rather a mixed L2 1 ϩB2 state. This is in contrast to NiMn-Ga alloys for which the B2-L2 1 transition occurs very fast. 10 At temperatures close to room temperature, magnetic ordering occurs. The L2 1 phase is ferromagnetic and for NiMn-Al, the ma...

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“…Since then alloys showing variant rearrangement under a magnetic field in their martensite phase have been categorized as ferromagnetic shape memory alloys (FMSMA) and this field of research has received much attention. Other FMSMAs, such as Fe-Pd [3], Fe-Pt [4], Ni-Mn-Al [5], Ni-Co-Ga [6], Ni-Co-Al [7] and NiFe-Ga [8], have successively been reported. In Ni-Mn-Ga systems, a huge MFIS of about 9.4 % has been reported in 14M [9] and about 12 % in non-modulated [10] martensites, despite the fact that the output stress is limited to several MPa [11,12].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics and Kinetics of Martensitic Transformation in Ni-Mn-based Magnetic Shape Memory Alloys

Kainuma

Kihara

et al. 2015

MATEC Web of Conferences

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Abstract. We herein present a review of recent thermodynamic and kinetic studies on Ni-Mn-based magnetic shape memory alloys along with some new data supporting the kinetic discussion. Magnetic phase diagrams and Clausius-Clapeyron relationships are mainly discussed for Ni-Mn-Ga and Ni-Mn-In systems. For the kinetics, a phenomenological model based on Seeger's model is used to describe the temperature dependence of magnetic field hysteresis, as well as the change of hysteresis under different sweeping rates of magnetic fields.

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Magnetic properties and large magnetic-field-induced strains in off-stoichiometric Ni–Mn–Al Heusler alloys

Cited by 224 publications

References 14 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

Magnetic properties and martensitic transition in annealed Ni50Mn30Al20

Thermodynamics and Kinetics of Martensitic Transformation in Ni-Mn-based Magnetic Shape Memory Alloys

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