Magnetic properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Ni</mml:mtext></mml:mrow><mml:mrow><mml:mn>50</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Mn</mml:mtext></mml:mrow><mml:mrow><mml:mn>34.8</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>In</mml:mtext></mml:mrow><mml:mrow><mml:mn>15.2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>probed by Mössbauer spectroscopy

Khovaylo, Vladimir; Kanomata, T.; Tanaka, Takeshi; Nakashima, Miho; Amako, Yasushi; Kainuma, Ryosuke; Umetsu, Rie Y.; Morito, Haruhiko; Miki, Hiroyuki

doi:10.1103/physrevb.80.144409

Cited by 135 publications

(69 citation statements)

References 44 publications

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“…[29] For the M phase below the Tc', a ferromagnetic hyperfine field was observed in the spectra of both systems. substitution of Co for Ni results in a drastic increase of the Tc in the P phase and a decrease of the Tc' in the M phase and the difference in magnetization between the P and M phases under 7 T reaches about 90 emu/g at around 300 K. Furthermore, the M s temperature decreases about 25 K with application of the magnetic field of 7 T due to the contribution of the Zeeman energy to the ferromagnetic P phase.…”

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confidence: 98%

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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confidence: 98%

NiMn-Based Metamagnetic Shape Memory Alloys

Kainuma

Ito

et al. 2009

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“…However, the magnetism of the martensitic phase is till date elusive. Polarized neutron scattering experiments describe this phase as antiferromagnetic (AFM) 6 , whereas Mössbauer study indicates it to be paramagnetic (PM) in nature 7 . Agreement, however, exists on the presence of a strong competition between FM and AFM interactions, but the origin of AFM interactions remains unclear.…”

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confidence: 99%

Antiferromagnetic exchange interactions in the Ni2Mn1.4In0.6ferr

et al. 2013

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“…Magnetization at lower temperatures gradually increases with increasing In content, and magnetic field cooling effect is observed for x = 10, 13, and 15. The large magnetization change observed at~300 K in the M-T curve for x = 15 (inset of Figure 1b) is due to the martensitic phase transformation, and the magnetic property at temperatures just below the transition temperature has been concluded to be paramagnetic based on Mössbauer spectroscopy [21].…”

Section: Methodsmentioning

confidence: 99%

“…Magnetic property is collinear-type antiferromagnetic with high Néel temperature for x = 0 [15]. This property changes to complicated magnetic properties, in which long-range magnetic ordering is absent and blocking behavior is observed [18,21]. Since neither crystal structure nor magnetic properties change sharply with changing In content, the decrease in θD may be caused by the substitution effect of the heavy element In.…”

Section: Specific Heat Measurementsmentioning

confidence: 99%

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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Magnetic properties ofNi50Mn34.8In15.2probed by Mössbauer spectroscopy

Cited by 135 publications

References 44 publications

NiMn-Based Metamagnetic Shape Memory Alloys

NiMn-Based Metamagnetic Shape Memory Alloys

Antiferromagnetic exchange interactions in the Ni2Mn1.4In0.6ferr

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

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