Magnetic properties on shape memory alloys Ni2Mn1+In1−

Kanomata, T.; Yasuda, Takeshi; Sasaki, Shogo; Nishihara, H.; Kainuma, Ryosuke; Ito, Wataru; Oikawa, Katsunari; Ishida, K.; Neumann, K.‐U.; Ziebeck, K.R.A.

doi:10.1016/j.jmmm.2008.11.079

Cited by 86 publications

(76 citation statements)

References 13 publications

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“…(2) Magnetic properties Very recently, Kanomata et al have reported the magnetic properties of the P phase for the NiMnSn and NiMnIn alloys [23,24]. They found that the magnetic moments per formula unit  m at 5 K for Ni 2 Mn 1+x Sn 1-x and Ni 2 Mn 1+x In 1-x estimated from the spontaneous magnetization can be plotted to the x as shown in Fig.…”

Section: Magnetic Properties In the Nimnsn And Nimnin Alloysmentioning

confidence: 99%

“…Very recently, Planes et al have reported a similar relation in the total magnetic moment for NiMnZ (Z:Ga, In, Sn and Sb) and pointed out that the data for these magnetic moments plotted to the electron concentration nearly follow the Slater-Pauling (SP) curve with the same slope. [22] [24]. The solid line in the figure is the curve calculated using the simple model indicated in the Ref.…”

Section: Magnetic Properties In the Nimnsn And Nimnin Alloysmentioning

confidence: 99%

“…The magnetic condition for this low temperature state is still unknown, but seems to be in a spin-glass-like state. [24], where Para, Ferro, and S.G.-like mean paramagnetic, ferromagnetic and spin glass-like states, respectively, and A and M indicate the austenite and martensite phases, respectively.…”

Section: Introductionmentioning

confidence: 99%

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NiMn-Based Metamagnetic Shape Memory Alloys

Kainuma

Ito

et al. 2009

MSF

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Abstract. The magnetic properties of the parent and martensite phases of the Ni 2 Mn 1+x Sn 1-x and Ni 2 Mn 1+x In 1-x ternary alloys and the magnetic field-induced shape memory effect obtained in NiCoMnIn alloys are reviewed, and our recent work on powder metallurgy performed for NiCoMnSn alloys is also introduced. The concentration dependence of the total magnetic moment for the parent phase in the NiMnSn alloys is very different from that in the NiMnIn alloys, and the magnetic properties of the martensite phase with low magnetization in both NiMnSn and NiMnIn alloys has been confirmed by Mössbauer examination as being paramagnetic, but not antiferromagnetic. The ductility of NiCoMnSn alloys is drastically improved by powder metallurgy using the spark plasma sintering technique, and a certain degree of metamagnetic shape memory effect has been confirmed. IntroductionSince Ullakko et al. [1] first reported a magnetic field-induced strain (MFIS) in a ferromagnetic single crystal of Ni 2 MnGa in 1996, the research in this field has drastically progressed and a huge MFIS of over 9% [2] has recently been reported. The MFIS in the Ni 2 MnGa alloys, however, is not due to the shape memory effect (SME) accompanying martensitic transformation, but rather to rearrangement of martensite variants by twin boundary migration in the martensite (M) phase. This twin boundary migration induced by a magnetic field is caused by the large crystalline magnetic anisotropy energy of the M phase with low crystal symmetry. Details on the MFIS in the Ni 2 MnGa alloys have recently been reviewed by Marioni et al. [3]. Although a large output strain and a rapid response can be confirmed in the Ni 2 MnGa alloy, the output stress is principally less than 5 MPa [4]. Furthermore, significant brittleness of the Ni 2 MnGa single crystal is a serious problem preventing application of this material. On the other hand, some trials using phase transformation itself to obtain an MFIS have been reported [5][6][7]. In Ni 2 MnGa alloys, however, a huge magnetic field is required to obtain magnetic field-induced transformation because both the P and M phases show ferromagnetism and the saturated magnetization of the M phase is comparable to that of the P phase [8]. Up to now, many Ni-based magnetic shape memory alloys (MSMAs) with similar magnetic properties, such as NiMnAl [9,10], NiCoAl [11,12], NiCoGa [12,13], NiFeGa [14,15], etc., have been reported and the characteristic features of their magnetic and martensitic transformations have been clarified.Recently, we have found an unusual transformation from a ferromagnetic P to a weak magnetic M phase in the NiMnIn-and NiMnSn-based Heusler alloys [16], which shows behaviors completely different from the previous MSMAs. These new types of magnetic shape memory alloys show many interesting phenomena derived from the unique transformation, such as magnetic field-induced phase transition, the inverse magnetocaloric effect [17,18], the giant magnetoresistance effect [19,20], giant

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Section: Magnetic Properties In the Nimnsn And Nimnin Alloysmentioning

confidence: 99%

Section: Magnetic Properties In the Nimnsn And Nimnin Alloysmentioning

confidence: 99%

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NiMn-Based Metamagnetic Shape Memory Alloys

Kainuma

Ito

et al. 2009

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“…The crystal structure is basically the L2 1 -type structure. The lattice parameter has been reported to a = 0.6071 nm for the x = 25 at room temperature and to decrease linearly with increasing the Mn composition [22]. The Figure 2b shows only warming process in M-T curves because there is almost no magnetic field cooling effect, in contrast to that for x ≤ 15 in Figure 1b.…”

Section: Magnetic Measurementsmentioning

confidence: 85%

Evidence of Change in the Density of States during the Martensitic Phase Transformation of Ni-Mn-In Metamagnetic Shape Memory Alloys

Umetsu

Ito

et al. 2017

Metals

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Specific heat measurements were performed at low temperatures for Ni 50 Mn 50−x In x alloys to determine their Debye temperatures (θ D ) and electronic specific heat coefficients (γ). For x ≤ 15, where the ground state is the martensite (M) phase, θ D decreases linearly and γ increases slightly with increasing In content. For x ≥ 16.2, where the ground state is the ferromagnetic parent (P) phase, γ increases with decreasing In content. Extrapolations of the composition dependences of θ D and γ in both the phases suggest that these values change discontinuously during the martensitic phase transformation. The value of θ D in the M phase is larger than that in the P phase. The behavior is in accordance with the fact that the volume of the M phase is more compressive than that of the P phase. On the other hand, γ is slightly larger in the P phase, in good agreement with the reported density of states around the Fermi energy obtained by the first-principle calculations.

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“…It is interesting to note that while being almost the same as those of the L2 1 high specimens in x < 25, the m of the L2 1 low specimens deviate from the straight line in the range of x > 25. With regard to the concentration dependence of the m , Kanomata et al 13) have reported that in the fully ordered L2 1 phase of the Ni 50 Mn 50Àx In x alloy, the magnetic moments of Mn atoms at the regular Mn sites are ferromagnetically coupled with that of the Mn atoms not only at the regular Mn sites of the third nearest neighbors (TNNs), but also at the In sites of second nearest neighbors (SNNs), and that the total magnetic moment (total) of the Ni 50 Mn 50Àx In x alloys is simply given by the following relation: high specimens can be explained in the whole concentration range. In the L2 1 low specimens in the region of x > 25, however, the m deviates from the straight line and it is apparent that this assumption is not applicable to the L2 1 specimens with a low degree of order in x > 25 at least.…”

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confidence: 99%

Influence of Annealing Conditions on Magnetic Properties of Ni50Mn50−xInx Heusler-Type Alloys

et al. 2011

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Magnetic measurements in Ni 50 Mn 50Àx In x alloys were performed in order to investigate the effect of the degree of order on the magnetic properties for specimens annealed at different temperatures. It was confirmed that Curie temperature, T C , and spontaneous magnetization, m , in as-quenched specimens with a low degree of order exhibited composition dependence of indium basically similar to those in as-annealed ones with a high degree of order reported in a previous paper. However, especially in the In-rich region of x > 25, both the T C and the m obtained from the as-quenched specimens were lower than those from the as-annealed specimens. Recently, an unusual type of magnetic shape memory alloy, which exhibits martensitic transformation from a ferromagnetic parent (P) phase to a paramagnetic martensite (M) phase, has been reported in NiMnIn-and NiMnSn-based Heusler alloys, the transformation mechanism beings completely different from that of conventional magnetic shape memory alloys.1) The martensitic transformation temperatures of these alloys are drastically decreased by application of a magnetic field and magnetic field-induced reverse transformation, which is a kind of metamagnetic transition, are observed below the martensitic reverse transformation starting temperature.2,3) Moreover, many interesting phenomena, such as the metamagnetic shape memory effect, 4,5) the inverse magnetocaloric effect, 2,6) the giant magnetoresistance effect 7,8) and the giant magnetothermal conductivity, 9) which are associated with the unique transformation, have been observed. Thus, these ferromagnetic shape memory alloys have received much attention as highperformance multiferroic materials. Details on the basic physical properties for NiMnZ Heusler alloys, including NiMnGa alloys, have recently been reviewed by Planes et al. 10)Very recently, the present authors have reported that in the Ni 45 Co 5 Mn 36:7 In 13:3 alloy, the order-disorder transformation temperature from B2 to L2 1 in the P phase, T B2/L2 1 t , is 896 K and the ordering transformation from the B2 phase can be suppressed by quenching from 923 K, that is, just above T B2/L2 1 t . 11) Furthermore, it has been confirmed that the martensitic and magnetic properties, such as Curie temperature, T C , martensitic transformation temperatures, and the crystal structure of the M phase, are considerably different depending on the degree of order of the P phase. On the other hand, the present authors have also reported that the T B2/L2 1 t for the Ni 50 Mn 50Àx In x alloys are located in the temperature region between 700 and 1100 K, which is comparable to that for the Ni 45 Co 5 Mn 36:7 In 13:3 alloy, as shown in Fig. 1. 12)It would be interesting to examine the effects of the degree of order on the magnetic properties in the Ni 50 Mn 50Àx In x ternary specimens annealed under different conditions. In the present study, the magnetic properties of the P phase obtained under different annealing temperatures were examined in NiMnIn alloys.Ni 50 Mn 50Àx In x (13 < x <...

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Magnetic properties on shape memory alloys Ni2Mn1+In1−

Cited by 86 publications

References 13 publications

NiMn-Based Metamagnetic Shape Memory Alloys

NiMn-Based Metamagnetic Shape Memory Alloys

Evidence of Change in the Density of States during the Martensitic Phase Transformation of Ni-Mn-In Metamagnetic Shape Memory Alloys

Influence of Annealing Conditions on Magnetic Properties of Ni<SUB>50</SUB>Mn<SUB>50−<I>x</I></SUB>In<I><SUB>x</SUB></I> Heusler-Type Alloys

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Magnetic properties on shape memory alloys Ni2Mn1+In1−

Cited by 86 publications

References 13 publications

NiMn-Based Metamagnetic Shape Memory Alloys

NiMn-Based Metamagnetic Shape Memory Alloys

Evidence of Change in the Density of States during the Martensitic Phase Transformation of Ni-Mn-In Metamagnetic Shape Memory Alloys

Influence of Annealing Conditions on Magnetic Properties of Ni<SUB>50</SUB>Mn<SUB>50&minus;<I>x</I></SUB>In<I><SUB>x</SUB></I> Heusler-Type Alloys

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Influence of Annealing Conditions on Magnetic Properties of Ni<SUB>50</SUB>Mn<SUB>50−<I>x</I></SUB>In<I><SUB>x</SUB></I> Heusler-Type Alloys