Phase diagram and composition optimization for magnetic shape memory effect in Ni–Co–Mn–Sn alloys

Cong, Daoyong; Roth, S.; Pötschke, Martin; Hürrich, C.; Schultz, L.

doi:10.1063/1.3454239

Cited by 75 publications

(33 citation statements)

References 18 publications

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“…Given our observation of correlation lengths of order 5 inter-cluster separations it is clear that these clusters are dense enough to strongly interact, giving credence to prior claims of collective effects. Indeed, in the context of the work of Wang et al [20] [17]. Some quantitative details may differ, but this could be due to the very slight differences in Sn content between the work of Cong et al (Sn 11 ) and our own (Sn 10 ).…”

Section: Discussionmentioning

confidence: 84%

“…Equation (1) is found to provide an adequate description of the data in this entire T interval, confirming that the behavior observed can be described by an assembly of thermally fluctuating classical macrospins with negligible anisotropy. The parameters n c , μ c , and [17].…”

Section: Iii1 Magnetometrymentioning

confidence: 99%

“…The extraordinary magnetic properties of this newly developed Ni 50-x Co x Mn 25+y Sn 25-y alloy were also studied in the work of Cong et al in 2010 [17], where a phase diagram was constructed, in the temperature-Co doping plane (0 ≤ x ≤ 10), at a similar Sn content (y = 11) to Srivastava et al [12]. The martensitic transformation temperature was found to decrease with x, from 400 K at x = 0, to below 273 K at x ≈ 8.…”

Section: Introductionmentioning

confidence: 99%

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Small-angle neutron scattering study of magnetic ordering and inhomogeneity across the martensitic phase transformation in Ni50−xCoxMn
Bhatti
¹
,
El-Khatib
²
,
Srivastava
³

et al. 2012
Phys. Rev. B

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The Heusler-derived multiferroic alloy Ni 50-x Co x Mn 40 Sn 10 has recently been shown to exhibit, at just above room temperature, a highly reversible martensitic phase transformation with an unusually large magnetization change. In this work the nature of the magnetic ordering above and below this transformation has been studied in detail in the critical composition range x = 6-8 via temperature-dependent (5-600 K) magnetometry and Small-Angle Neutron Scattering (SANS). We observe fairly typical paramagnetic to long-range-ordered ferromagnetic phase transitions on cooling to 420-430 K, with the expected critical spin fluctuations, followed by first-order martensitic phase transformations to a non-ferromagnetic state below 360-390 K. The static magnetization reveals complex magnetism in this low temperature non-ferromagnetic 2 phase including a Langevin-like field dependence, distinct spin freezing near 60 K, and significant exchange bias effects, consistent with superparamagnetic blocking of ferromagnetic clusters of nanoscopic dimensions. We demonstrate that these spin clusters, whose existence has been hypothesized in a variety of martensitic alloys exhibiting competition between ferromagnetic and antiferromagnetic exchange interactions, can be directly observed by SANS.The scattering data are consistent with a liquid-like spatial distribution of interacting magnetic clusters with a mean center-to-center spacing of 12 nm. Considering the behavior of the superparmagnetism, cooling-field and temperature-dependent exchange bias, and magnetic SANS, we discuss in detail the physical form and origin of these spin clusters, their inter-cluster interactions, the nature of the ground state magnetic ordering in the martensitic phase, and the implications for our understanding of such alloy systems.

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Section: Discussionmentioning

confidence: 84%

Section: Iii1 Magnetometrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Small-angle neutron scattering study of magnetic ordering and inhomogeneity across the martensitic phase transformation in Ni50−xCoxMn
Bhatti
¹
,
El-Khatib
²
,
Srivastava
³

et al. 2012
Phys. Rev. B

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“…That is due to their extensive applications in the magnetic refrigeration, aerospace, and automotive industries [6]. In particular, these alloys have the ability to undergo a reversible first-order martensitic transformation (FOMT) from a high-temperature cubic austenite phase to a structurally martensite phase [7,8]. FOMT takes place by the diffusionless shearing of the parent austenitic phase.…”

Section: Introductionmentioning

confidence: 99%

Thermal and Structural Analysis of Mn49.3Ni43.7Sn7.0 Heusler Alloy Ribbons

Bachaga

Daly

Khitouni

et al. 2015

Entropy

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Abstract:The martensitic transformation and the solidification structures of Mn49.3Ni43.7Sn7.0 alloy ribbons prepared by melt-spinning were investigated by means of scanning electron microscopy, X-ray diffraction and differential scanning calorimetry. In those experiments special attention was given to melt spinning processing parameters such as the linear surface speed of the copper wheel rotating, the injection overpressure and the distance between wheel and injection quartz tube. Transformation entropy was found higher when increasing linear surface speed or the distance from injection point to wheel. The resulting samples showed chemical compositions close to the nominal ones and, at room temperature, crystallized in a monoclinic single-phase martensite with 14M modulation (without a significant variation in the cell parameters). Strong dependence of ribbon thickness on processing parameters was found. The average grain size varied between 1.6 and 6.6 μm, while the start temperature of the martensitic temperature varied from 394 to 430 K.

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“…13,14 Both the MPT and magnetic properties are very sensitive to their compositions, especially doped with 3d transition elements on Ni or Mn site. 15 There should be emphasized that the Ni or Mn in ternary alloy partially replaced by a small amount of nonmagnetic element still could induce considerable difference of magnetization between martensite and austenite compared with a Author to whom correspondence should be addressed. Electronic mail: cjing@staff.shu.edu.cn.…”

Section: 8mentioning

confidence: 99%

The effect of Pd on martensitic transformation and magnetic properties for Ni50Mn38−xPdxSn12Heusler alloys

Jing

Zheng

et al. 2016

AIP Advances

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In the past decade, Mn rich Ni-Mn based alloys have attained considerable attention due to their abundant physics and potential application as multifunctional materials. In this paper, polycrystalline Ni50Mn38−xPdxSn12 (x = 0, 2, 4, 6) Heusler alloys have been prepared, and the martensitic phase transformation (MPT) together with the shape memory effect and the magnetocaloric effect has been investigated. The experimental result indicates that the MPT evidently shifts to a lower temperature with increase of Pd substitution for Mn atoms, which can be attributed to the weakness of the hybridization between the Ni atom and excess Mn on the Sn site rather than the electron concentration. The physics properties study focused on the sample of Ni50Mn34Pd4Sn12 shows a good two-way shape memory behavior, and the maximum value of strain Δ L/L reaches about 0.13% during the MPT. The small of both entropy change Δ ST and magnetostrain can be ascribed to the inconspicuous influence of magnetic field induced MPT.

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Phase diagram and composition optimization for magnetic shape memory effect in Ni–Co–Mn–Sn alloys

Cited by 75 publications

References 18 publications

Small-angle neutron scattering study of magnetic ordering and inhomogeneity across the martensitic phase transformation in Ni50−xCoxMn
Bhatti
¹
,
El-Khatib
²
,
Srivastava
³

et al. 2012
Phys. Rev. B

Small-angle neutron scattering study of magnetic ordering and inhomogeneity across the martensitic phase transformation in Ni50−xCoxMn
Bhatti
¹
,
El-Khatib
²
,
Srivastava
³

et al. 2012
Phys. Rev. B

Thermal and Structural Analysis of Mn49.3Ni43.7Sn7.0 Heusler Alloy Ribbons

The effect of Pd on martensitic transformation and magnetic properties for Ni50Mn38−xPdxSn12Heusler alloys

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Phase diagram and composition optimization for magnetic shape memory effect in Ni–Co–Mn–Sn alloys

Cited by 75 publications

References 18 publications

Small-angle neutron scattering study of magnetic ordering and inhomogeneity across the martensitic phase transformation in Ni50−xCoxMnBhatti1, El-Khatib2, Srivastava3 et al. 2012Phys. Rev. B

Small-angle neutron scattering study of magnetic ordering and inhomogeneity across the martensitic phase transformation in Ni50−xCoxMnBhatti1, El-Khatib2, Srivastava3 et al. 2012Phys. Rev. B

Thermal and Structural Analysis of Mn49.3Ni43.7Sn7.0 Heusler Alloy Ribbons

The effect of Pd on martensitic transformation and magnetic properties for Ni50Mn38−xPdxSn12Heusler alloys

Contact Info

Product

Resources

About

Small-angle neutron scattering study of magnetic ordering and inhomogeneity across the martensitic phase transformation in Ni50−xCoxMn
Bhatti
¹
,
El-Khatib
²
,
Srivastava
³

et al. 2012
Phys. Rev. B

Small-angle neutron scattering study of magnetic ordering and inhomogeneity across the martensitic phase transformation in Ni50−xCoxMn
Bhatti
¹
,
El-Khatib
²
,
Srivastava
³

et al. 2012
Phys. Rev. B