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Artykuły w czasopismach na temat „Heusler Based Metamagnetic Shape Memory Alloys”

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Data publikacji: 7 września 2023

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1

Kainuma, Ryosuke, W. Ito, R. Y. Umetsu, V. V. Khovaylo i T. Kanomata. "Metamagnetic Shape Memory Effect and Magnetic Properties of Ni-Mn Based Heusler Alloys". Materials Science Forum 684 (maj 2011): 139–50. http://dx.doi.org/10.4028/www.scientific.net/msf.684.139.

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In some Ni-Mn-In- and Ni-Mn-Sn-based Heusler-type alloys, martensitic transformation from the ferromagnetic parent phase to the paramagnetic martensite phase appears and magnetic field-induced reverse transformation, namely, metamagnetic phase transition, is detected. In this paper, the metamagnetic shape memory effect due to the metamagnetic phase transition and the magnetostress effect in the Ni-Co-Mn-In alloys are introduced and the phase diagrams of Ni50Mn50-yXy (X: In, Sn, Sb) alloys are shown as basic information. Furthermore, the magnetic properties of both the parent and martensite phases in the Ni-Mn-In- and Ni-Mn-Sn-based metamagnetic shape memory alloys are also reviewed.
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Kainuma, Ryosuke, Katsunari Oikawa, Wataru Ito, Yuji Sutou, Takeshi Kanomata i Kiyohito Ishida. "Metamagnetic shape memory effect in NiMn-based Heusler-type alloys". Journal of Materials Chemistry 18, nr 16 (2008): 1837. http://dx.doi.org/10.1039/b713947k.

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Kainuma, R., W. Ito, R. Y. Umetsu, V. V. Khovaylo i T. Kanomata. "ChemInform Abstract: Metamagnetic Shape Memory Effect and Magnetic Properties of Ni-Mn Based Heusler Alloys". ChemInform 43, nr 12 (23.02.2012): no. http://dx.doi.org/10.1002/chin.201212211.

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Ghazinezhad, Z., P. Kameli, A. Ghotbi Varzaneh, I. Abdolhosseini Sarsari, M. Norouzi-Inallu, T. Amiri, D. Salazar i in. "Cd-doping effects in Ni–Mn–Sn: experiment and ab-initio study". Journal of Physics D: Applied Physics 55, nr 25 (31.03.2022): 255001. http://dx.doi.org/10.1088/1361-6463/ac5f33.

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Abstract Martensitic transformation (MT), magnetic properties, and magnetocaloric effect (MCE) in Heusler-type Ni47Mn40Sn13−x Cd x (x= 0, 0.75, 1, 1.25 at. %) metamagnetic shape memory alloys (MetaMSMAs) are investigated, both experimentally and theoretically, as a function of doping with Cd. Ab-initio computations reveal that the ferromagnetic (FM) configuration is energetically more favorable in the cubic phase than the antiferromagnetic (AFM) state in undoped and doped alloys as well. Moreover, it is revealed that the alloys in the ground state exhibit a tetragonal structure confirming the existence of MT, in agreement with the experiments. It was indicated, both in theory and practice, that a reduction of the unit cell volume and an increase of the MT temperature as a function of the Cd doping. Indirect estimations of MCE in the vicinity of MT were carried out by using thermomagnetization curves measured under different magnetic fields up to 5 T. The results demonstrated that the doped alloys exhibit enhanced values of the inverse MCE comparable with those of Ni-Mn-based MetaMSMAs. Maximum magnetic entropy change in a field change of 2 T increases from 3.0 J .k g − 1 K − 1 for the undoped alloy to 3.4 and 5.0 J .k g − 1 K − 1 for the alloys doped with 0.75 and 1 at.% of Cd, respectively. The inverse and conventional MCE were explored by direct measurements of the adiabatic temperature change under the magnetic field change of 1.96 T. The Cd doping increased the maximum of inverse MCE by nearly 78% from 0.9 K to 1.6 K for the undoped and doped alloys, respectively. The results depicted that Cd doping can effectively tailor the structural, magnetic, and MCE properties of the Ni–Mn–Sn MetaMSMAs.
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Kainuma, Ryosuke, K. Ito, W. Ito, R. Y. Umetsu, T. Kanomata i Kiyohito Ishida. "NiMn-Based Metamagnetic Shape Memory Alloys". Materials Science Forum 635 (grudzień 2009): 23–31. http://dx.doi.org/10.4028/www.scientific.net/msf.635.23.

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The magnetic properties of the parent and martensite phases of the Ni2Mn1+xSn1-x and Ni2Mn1+xIn1-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.
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6

Umetsu, Rie Y., Xiao Xu i Ryosuke Kainuma. "NiMn-based metamagnetic shape memory alloys". Scripta Materialia 116 (kwiecień 2016): 1–6. http://dx.doi.org/10.1016/j.scriptamat.2016.01.006.

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7

Bai, Li Na, Jian Jun Zhang i Gui Xing Zheng. "Martensitic and Magnetic Transformation Behaviors in Ni50Mn34.5In15.5-xGdx Metamagnetic Shape Memory Alloys". Key Engineering Materials 480-481 (czerwiec 2011): 75–79. http://dx.doi.org/10.4028/www.scientific.net/kem.480-481.75.

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Magnetic Shape Memory Alloys（MSMA）have attracted considerable attention due to their potential application in actuators driven by temperature and magnetic field . Research on shape memory alloys found that the Heusler alloys of MSMA body-centered cubic lattice structure were occured giant strains by magnetic fields[1-4]. Japanese scholars found the new magnetic Shape Memory Alloys Ni-Mn-In and Ni-Co-Mn-In Heusler alloys completely under the control of the magnetic shape fields in 2005[5-7]. In applied MSMA fields, the Ni-Mn-In Heusler alloys start the possibility of using shape memory effect only driven by magnetic field. However, the high brittleness of polycrystalline intermetallic compounds hinders the practical use. Until now, the investigated alloys are ongoing research to resolve, the investigation was carried out to employ rapid quenching by melt spinning to produce Mn–Ni–In Heusler alloys by JLSánchez Llamazares et al [8], and the ribbons of Ni-Mn-In Heusler alloys grain preferential texture. We use the rare earth Gd to improve machining performance of the new alloys, and study the change of microstructure and magnetic properties of alloys which may be a subject of significant scientific and technological interests.
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8

Jing, C., H. L. Zhang, Z. Li, D. H. Yu, S. X. Cao i J. C. Zhang. "Martensitic Transformation and Metamagnetic Shape Memory Effect in Ni46Co4Mn37in13 Heusler Alloy". Materials Science Forum 687 (czerwiec 2011): 505–9. http://dx.doi.org/10.4028/www.scientific.net/msf.687.505.

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The phase transition strain and magnetostrain during the martensitic transformation have been systematically investigated in Ni46Co4Mn37In13 Heusler alloy. A large phase transition strain with the value of about 0.25% upon martensitic transition has been observed, which is much larger than that in other metamagnetic shape memory alloys. In addition, such phase transition strain can be also obtained by the field change of about 50 kOe, exhibiting a large metamagnetic shape memory effect with nonprestrain. This behavior can be attributed to magnetoelastic coupling, which is caused by large difference in Zeeman energy between austenitic and martensitic phases.
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9

Kainuma, R., K. Ito, W. Ito, R. Y. Umetsu, T. Kanomata i K. Ishida. "ChemInform Abstract: NiMn-Based Metamagnetic Shape Memory Alloys". ChemInform 41, nr 47 (28.10.2010): no. http://dx.doi.org/10.1002/chin.201047219.

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10

Planes, Antoni, Lluís Mañosa i Mehmet Acet. "Recent Progress and Future Perspectives in Magnetic and Metamagnetic Shape-Memory Heusler Alloys". Materials Science Forum 738-739 (styczeń 2013): 391–99. http://dx.doi.org/10.4028/www.scientific.net/msf.738-739.391.

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Magnetic shape-memory properties refer to the ability of certain materials to show strong response in strain to an applied magnetic field. This strain is caused by either inducing the martensitic transition or rearranging martensitic variants. In the first, case a superelastic effect is possible, while in the second, the system is able to show the shape-memory effect. The complex behaviour displayed by these materials is mainly a consequence of a strong interplay between magnetism and structure which is driven by a martensitic transition. This interplay is the source of many other observed effects such as giant magneto-resistance, exchange bias and magnetocaloric effects. In this paper, we will overview the present state of the art, discuss present challenges and outline some future perspectives in the field.
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11

Khovaylo, Vladimir, Maria Lyange, Konstantin Skokov, Oliver Gutfleisch, Ratnamala Chatterjee, Xiao Xu i Ryosuke Kainuma. "Adiabatic Temperature Change in Metamagnetic Ni(Co)-Mn-Al Heusler Alloys". Materials Science Forum 738-739 (styczeń 2013): 446–50. http://dx.doi.org/10.4028/www.scientific.net/msf.738-739.446.

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Two representatives of Ni(Co)-Mn-Al metamagnetic shape memory alloy system, Ni45Co5Mn31Al19 and Ni35Co15Mn35Al15, have been studied with respect to their magnetocaloric properties. Experimental study of the magnetocaloric effect by a direct measurement of the adiabatic temperature change ΔTad revealed that in both the samples ΔTad depends on the measurement protocol as well as on the magnetic prehistory of the samples. For the applied magnetic field µ0H = 1.93 T, the largest adiabatic temperature change, |ΔTad| ~ 0.7 K, has been observed in the Ni35Co15Mn35Al15 sample at T = 464 K.
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12

Shen, Yi, Zhiyang Wei, Wen Sun, Yifei Zhang, Enke Liu i Jian Liu. "Large elastocaloric effect in directionally solidified all-d-metal Heusler metamagnetic shape memory alloys". Acta Materialia 188 (kwiecień 2020): 677–85. http://dx.doi.org/10.1016/j.actamat.2020.02.045.

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13

Ito, W., Y. Imano, R. Kainuma, Y. Sutou, K. Oikawa i K. Ishida. "Martensitic and Magnetic Transformation Behaviors in Heusler-Type NiMnIn and NiCoMnIn Metamagnetic Shape Memory Alloys". Metallurgical and Materials Transactions A 38, nr 4 (20.04.2007): 759–66. http://dx.doi.org/10.1007/s11661-007-9094-9.

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14

Bachaga, T., J. Zhang, M. Khitouni i J. J. Sunol. "NiMn-based Heusler magnetic shape memory alloys: a review". International Journal of Advanced Manufacturing Technology 103, nr 5-8 (27.04.2019): 2761–72. http://dx.doi.org/10.1007/s00170-019-03534-3.

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15

Yang, Xiong, Ying Wang, Mingrun Du i Wendi Zhang. "Probing Ferromagnetic Shape Memory Alloys in Pt-Based Heusler Compounds". Acta Physica Polonica A 139, nr 1 (styczeń 2021): 8–13. http://dx.doi.org/10.12693/aphyspola.139.8.

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16

Planes, Antoni, Lluís Mañosa, Xavier Moya, Jordi Marcos, Mehmet Acet, Thorsten Krenke, Seda Aksoy i Eberhard F. Wassermann. "Magnetocaloric and Shape-Memory Properties in Magnetic Heusler Alloys". Advanced Materials Research 52 (czerwiec 2008): 221–28. http://dx.doi.org/10.4028/www.scientific.net/amr.52.221.

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In this paper, we discuss the magnetocaloric behavior of Ni-Mn-based Heusler alloys in rela- tion to their shape-memory and superelastic properties. We show that the magnetocaloric effect in these materials originates from two different contributions: (i) the coupling that is related to a strong uniaxial magnetic anisotropy and takes place at the length scale of martensite variants and magnetic domains (extrinsic effect), and (ii) the intrinsic microscopic magnetostructural coupling. The first contribution is intimately related to the magnetically induced rearrange- ment of martensite variants (magnetic shape-memory) and controls the magnetocaloric effect at small applied fields, while the latter is dominant at higher fields and is essentially related to the possibility of magnetically inducing the martensitic transition (magnetic superelasticity). The possibility of inverse magnetocaloric effect associated with these two contributions is also considered.
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17

Acet, Mehmet, i Eberhard F. Wassermann. "Magnetic Interactions in Ni-Mn-Based Magnetic Shape-Memory Heusler Alloys". Advanced Engineering Materials 14, nr 8 (4.07.2012): 523–29. http://dx.doi.org/10.1002/adem.201200098.

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18

Villa, E., F. Villa, B. Rodriguez Crespo, P. Lazpita, D. Salazar, H. Hosoda i V. Chernenko. "Shape memory and elastocaloric properties of melt-spun NiMn-based Heusler alloys". Journal of Alloys and Compounds 965 (listopad 2023): 171437. http://dx.doi.org/10.1016/j.jallcom.2023.171437.

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19

Entel, Peter, Markus E. Gruner, Antje Dannenberg, Mario Siewert, Sanjeev K. Nayak, Heike C. Herper i Vasiliy D. Buchelnikov. "Fundamental Aspects of Magnetic Shape Memory Alloys: Insights from Ab Initio and Monte Carlo Studies". Materials Science Forum 635 (grudzień 2009): 3–12. http://dx.doi.org/10.4028/www.scientific.net/msf.635.3.

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Ferromagnetic Heusler alloys like Ni-Mn-Z (Z = Al, Ga, In, Sn, Sb), which undergo a martensitic phase transformation, are on the edge of being used in technological applications involving actuator and magnetocaloric devices. The other class of ferromagnetic full Heusler alloys like Co-Mn-Z (Z = Al, Si, Ga, Ge, Sn) not undergoing a structural phase transition, are half-metals (in contrast to the Ni-based systems) with high spin polarization at the Fermi level and are of potential importance for future spintronics devices. On the basis of recent ab initio calculations, we highlight the main differences between the two classes of Heusler based materials.
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20

Umetsu, Rie Y., Xiao Xu, Wataru Ito, Takeshi Kanomata i Ryosuke Kainuma. "Magnetic Properties of Ni-based Heusler Alloys Showing Meta-Magnetic Shape Memory Effects". Materia Japan 54, nr 3 (2015): 98–104. http://dx.doi.org/10.2320/materia.54.98.

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Xu, Xiao. "Reentrant Martensitic Transformation and Novel Shape Memory Effect in Co-based Heusler Alloys". Materia Japan 55, nr 9 (2016): 421–25. http://dx.doi.org/10.2320/materia.55.421.

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Priolkar, K. R., P. A. Bhobe i P. R. Sarode. "Hybridization Effects in Ni-Mn Based Shape Memory Alloys: XAFS Study". Advanced Materials Research 52 (czerwiec 2008): 155–64. http://dx.doi.org/10.4028/www.scientific.net/amr.52.155.

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Martensitic and magnetic properties of ferromagnetic shape memory alloys are known to depend up on structural modulations and associated changes in the Fermi surface. These modulations although periodic and spanning over multiple unit cells, involve movement of atoms typically of the order of 0.01Å. Therefore X-ray Absorption Fine Structure (XAFS) is an ideal tool to map both, local atomic movements and changes in density of states (DOS) due to changing hybridization as the system transforms from austenitic to martensitic phase. This paper presents a compilation of our XAFS studies on the Ni-Mn based shape memory alloys. A complete description of the changes in local structure around the constituent metal ions in the following alloy compositions: Ni2+xMn1-xGa, Ni2Mn1.4Sn0.6 and Ni2Mn1.4In0.6 in the austenitic and martensitic phases have been obtained. The results give the new experimental evidence for the crucial hybridization component that influences and leads to structural transition in these Ni-Mn based Heusler alloys.
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Entel, Peter, Vasiliy D. Buchelnikov, Markus E. Gruner, Alfred Hucht, Vladimir V. Khovailo, Sanjeev K. Nayak i Alexey T. Zayak. "Shape Memory Alloys: A Summary of Recent Achievements". Materials Science Forum 583 (maj 2008): 21–41. http://dx.doi.org/10.4028/www.scientific.net/msf.583.21.

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The Ni-Mn-Ga shape memory alloy displays the largest shape change of all known magnetic Heusler alloys with a strain of the order of 10% in an external magnetic field of less than one Tesla. In addition, the alloys exhibit a sequence of intermediate martensites with the modulated structures usually appearing at c/a < 1 while the low-temperature non- modulated tetragonal structures have c/a > 1. Typically, in the Ni-based alloys, the martensitic transformation is accompanied by a systematic change of the electronic structure in the vicinity of the Fermi energy, where a peak in the electronic density of states from the non-bonding Ni states is shifted from the occupied region to the unoccupied energy range, which is associated with a reconstruction of the Fermi surface, and, in most cases, by pronounced phonon anomalies. The latter appear in high-temperature cubic austenite, premartensite but also in the modulated phases. In addition, the modulated phases have highly mobile twin boundaries which can be rearranged by an external magnetic field due to the high magnetic anisotropy, which builds up in the martensitic phases and which is the origin of the magnetic shape memory effect. This overall scenario is confirmed by first-principles calculations.
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Yan, Hai-Le, Xiao-Ming Huang, Jin-Han Yang, Ying Zhao, Feng Fang, Nan Jia, Jing Bai i in. "A strategy of optimizing magnetism and hysteresis simultaneously in Ni–Mn-based metamagnetic shape memory alloys". Intermetallics 130 (marzec 2021): 107063. http://dx.doi.org/10.1016/j.intermet.2020.107063.

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Chen, Zhen, Daoyong Cong, Shilei Li, Yin Zhang, Shaohui Li, Yuxian Cao, Shengwei Li, Chao Song, Yang Ren i Yandong Wang. "External-Field-Induced Phase Transformation and Associated Properties in a Ni50Mn34Fe3In13 Metamagnetic Shape Memory Wire". Metals 11, nr 2 (10.02.2021): 309. http://dx.doi.org/10.3390/met11020309.

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Metamagnetic shape memory alloys exhibit a series of intriguing multifunctional properties and have great potential for applications in magnetic actuation, sensing and magnetic refrigeration. However, the poor mechanical properties of these alloys with hardly any tensile deformability seriously limit their practical application. In the present work, we developed a Ni-Fe-Mn-In microwire that exhibits both a giant, tensile superelasticity and a magnetic-field-induced first-order phase transformation. The recoverable strain of superelasticity is more than 20% in the temperature range of 233–283 K, which is the highest recoverable strain reported heretofore in Ni-Mn-based shape memory alloys (SMAs). Moreover, the present microwire exhibits a large shape memory effect with a recoverable strain of up to 13.9% under the constant tensile stress of 225 MPa. As a result of the magnetic-field-induced first-order phase transformation, a large reversible magnetocaloric effect with an isothermal entropy change ΔSm of 15.1 J kg−1 K−1 for a field change from 0.2 T to 5 T was achieved in this microwire. The realization of both magnetic-field and tensile-stress-induced transformations confers on this microwire great potential for application in miniature multi-functional devices and provides an opportunity for multi-functional property optimization under coupled multiple fields.
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Moya, Xavier, Lluís Mañosa, Antoni Planes, Seda Aksoy, Mehmet Acet, Eberhard F. Wassermann i Thorsten Krenke. "Effect of External Fields on the Martensitic Transformation in Ni-Mn Based Heusler Alloys". Advanced Materials Research 52 (czerwiec 2008): 189–97. http://dx.doi.org/10.4028/www.scientific.net/amr.52.189.

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In this paper, we discuss the possibility of inducing a martensitic transition by means of an applied magnetic field or hydrostatic pressure in Ni-Mn based Heusler shape memory alloys. We report on the shift of the martensitic transition temperatures with applied magnetic field and applied pressure and we show that it is possible to induce the structural transformation in a Ni50Mn34In16 alloy by means of both external fields due to: (i) the low value of the entropy change and (ii) the large change of magnetization and volume, which occur at the martensitic transition.
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Fichtner, Tina, Changhai Wang, Aleksandr Levin, Guido Kreiner, Catalina Mejia, Simone Fabbrici, Franca Albertini i Claudia Felser. "Effects of Annealing on the Martensitic Transformation of Ni-Based Ferromagnetic Shape Memory Heusler Alloys and Nanoparticles". Metals 5, nr 2 (25.03.2015): 484–503. http://dx.doi.org/10.3390/met5020484.

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Yan, Hai-Le, Hao-Xuan Liu, Ying Zhao, Nan Jia, Jing Bai, Bo Yang, Zongbin Li i in. "Unraveling the abnormal dependence of phase stability on valence electron concentration in Ni–Mn-based metamagnetic shape memory alloys". Journal of Applied Physics 128, nr 4 (28.07.2020): 045104. http://dx.doi.org/10.1063/5.0009638.

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Singh, R. K., M. Manivel Raja, P. Ghosal i R. P. Mathur. "Effect of Mn Concentration on Magneto-mechnaical Properties in Directionally Solidified Ferromagnetic Shape Memory Ni-Mn-Ga Alloys". Defence Science Journal 66, nr 4 (28.06.2016): 391. http://dx.doi.org/10.14429/dsj.66.10214.

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Heusler type alloys Ni50Mn25+xGa25-x (x=2,3,4 and 5) based on near stoichiometric Ni2MnGa compositions were directionally solidified using modified Bridgman method. The alloys thus prepared were characterized for their chemical composition, crystal structure, microstructure, phase transformation, magnetic and magneto-mechanical properties. The directionally solidified Ni50Mn30Ga20 alloy rod exhibited maximum magnetocrystalline value of 95 kJm-3 and lowest detwinning stresses for martensite phase of about 5MPa. The reversible room temperature magnetic field induced strain of 0.2% under external magnetic field of 0.6T and 0.05kN bias load was obtained for the directionally solidified Ni50Mn30Ga20 alloy.
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Frolova, L., J. Mino, T. Ryba, J. Gamcova, A. Dzubinska, M. Reiffers, P. Diko i in. "Novel compositions of Heusler-based glass-coated microwires for practical applications using shape memory effect". Journal of Alloys and Compounds 747 (maj 2018): 21–25. http://dx.doi.org/10.1016/j.jallcom.2018.03.035.

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Pushin, Vladimir, Alexander Korolyov, Nataliya Kuranova, Elena Marchenkova i Yurii Ustyugov. "New Metastable Baro- and Deformation-Induced Phases in Ferromagnetic Shape Memory Ni2MnGa-Based Alloys". Materials 15, nr 6 (19.03.2022): 2277. http://dx.doi.org/10.3390/ma15062277.

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Structural and phase transformations in the microstructure and new metastable baro- and deformation-induced phases of the Ni50Mn28.5Ga21.5 alloy, typical of the unique class of ferromagnetic shape memory Heusler alloys, have been systematically studied for the first time. Phase X-ray diffraction analysis, transmission and scanning electron microscopy, and temperature measurements of electrical resistivity and magnetic characteristics in strong magnetic fields were used. It was found that in the course of increasing the pressure from 3 to 12 GPa, the metastable long-period structure of martensite modulated according to the 10M-type experienced transformation into a final non-modulated 2M structure. It is proved that severe shear deformation by high pressure torsion (HPT) entails grainsize refinement to a nanocrystalline and partially amorphized state in the polycrystalline structure of the martensitic alloy. In this case, an HPT shear of five revolutions under pressure of 3 GPa provided total atomic disordering and a stepwise structural-phase transformation (SPT) according to the scheme 10M → 2M → B2 + A2, whereas under pressure of 5 GPa the SPT took place according to the scheme 10M → 2M → B2 → A1. It is shown that low-temperature annealing at a temperature of 573 K caused the amorphous phase to undergo devitrification, and annealing at 623–773 K entailed recrystallization with the restoration of the L21 superstructure in the final ultrafine-grained state. The size effect of suppression of the martensitic transformation in an austenitic alloy with a critical grain size of less than 100 nm at cooling to 120 K was determined. It was established that after annealing at 773 K, a narrow-hysteresis thermoelastic martensitic transformation was restored in a plastic ultrafine-grained alloy with the formation of 10M and 14M martensite at temperatures close to those characteristic of the cast prototype of the alloy.
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Wederni, Asma, Mihail Ipatov, Julián-María González, Mohamed Khitouni i Joan-Josep Suñol. "Ni-Mn-Sn-Cu Alloys after Thermal Cycling: Thermal and Magnetic Response". Materials 14, nr 22 (13.11.2021): 6851. http://dx.doi.org/10.3390/ma14226851.

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Heusler Ni-Mn-Sn-based alloys are good candidates for magnetic refrigeration. This application is based on cycling processes. In this work, thermal cycles (100) have been performed in three ribbons produced by melt-spinning to check the thermal stability and the magnetic response. After cycling, the temperatures were slowly shifted and the thermodynamic properties were reduced, the entropy changed at about 3–5%. Likewise, the thermomagnetic response remains similar. Thus, these candidates maintain enough thermal stability and magnetic response after cycling. Likewise, Cu addition shifts the structural transformation to higher temperatures, whereas the Curie temperature is always near 310 K. Regarding magnetic shape memory applications, the best candidate is the Ni49Mn36 Sn14Cu1 alloy.
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Chen, Zongbin, Huan Wei, Heju Xu, Yongchun Gao, Tie Yang, Xiaotian Wang i Xuebin Chen. "First-Principles Study on a New All-d-Metal Full-Heusler-Based Shape-Memory Alloy Cd2MnPd". SPIN 09, nr 03 (wrzesień 2019): 1950012. http://dx.doi.org/10.1142/s2010324719500127.

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A new all-[Formula: see text]-metal full-Heusler alloy (Cd2MnPd) was designed based on density functional theory. Its crystal structure, band structure, density of states, magnetism, and the possibility of martensitic transformation were studied. The calculated total energy shows that the most stable cubic structure of this alloy is the L21 type at ferromagnetic (FM) state, and the equilibrium lattice constant is 6.57[Formula: see text]Å. The band structure and density of states show that it is a FM metal with a total magnetic moment of 3.97[Formula: see text][Formula: see text], mainly originating from the Mn element. The results of the martensitic transformation investigation show that the martensitic phase has minimum energy when the c/a ratio is 1.35, and the absolute value of the energy difference ([Formula: see text]) between the martensitic and the austenitic phases is 0.07[Formula: see text]eV. This indicates that there is a high possibility that a stable martensitic phase exists. Furthermore, [Formula: see text] can be tuned by uniform strain, and the absolute value of [Formula: see text] increases as the volume increases in the range of [Formula: see text] ([Formula: see text] is the optimal volume, namely, the cubic volume under its equilibrium lattice). In conclusion, Cd2MnPd may be a good candidate for ferromagnetic shape-memory alloys (FSMAs). We expect that our theoretical prediction can provide guidance for exploring valuable FSMAs experimentally.
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Ren, Zhi, Jian Jiao, Yang Liu, Jing Jiang Song, Xiao Hong Zhang, He Yan Liu i Song Tao Li. "The First Principle Studies on the Ferromagnetic Shape Memory Effect of Ni2YIn(Y=Fe, Co) Heusler Alloys". Key Engineering Materials 727 (styczeń 2017): 185–90. http://dx.doi.org/10.4028/www.scientific.net/kem.727.185.

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The atom occupied sites, structures, tetragonal transformation and magnetic properties are studied by the first principles calculations. From least energy principle, the calculated equilibrium lattice parameter is 6.03 Å and 6.00 Å for Cu2MnAl type Ni2YIn (Y=Fe, Co) alloys, respectively. The Ni2YIn (Y=Fe, Co) alloys show steady martensitic phases at c/a=1.29 and c/a=1.36 based on the EBP’s method. Ni atoms and Y (Y=Fe, Co) contribute to the total magnetic moments, and keep parallel aligned in martensitic and austenitic phases. The Ni2YIn (Y=Fe, Co) alloys are the candidates for Ferromagnetic Shape Memory Alloys.
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35

Li, Zong-Bin, Bo Yang, Yu-Dong Zhang, Claude Esling, Xiang Zhao i Liang Zuo. "Crystallographic insights into diamond-shaped 7M martensite in Ni–Mn–Ga ferromagnetic shape-memory alloys". IUCrJ 6, nr 5 (15.08.2019): 909–20. http://dx.doi.org/10.1107/s2052252519010819.

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For Heusler-type Ni–Mn–Ga ferromagnetic shape-memory alloys, the configuration of the martensite variants is a decisive factor in achieving a large magnetic shape-memory effect through field-induced variant reorientation. Based upon the spatially resolved electron backscatter diffraction technique, the microstructural evolution associated with the martensitic transformation from austenite to seven-layered modulated (7M) martensite was investigated on a polycrystalline Ni53Mn22Ga25 alloy. It was clearly shown that grain interior nucleation led to the formation of diamond-shaped 7M martensite within the parent austenite matrix. This diamond microstructure underwent further growth through an isotropic expansion with the coordinated outward movement of four side habit planes, followed by an anisotropic elongation with the forward extension of a type-I twin pair. A two-step growth model is proposed to describe the specific morphology and crystallography of 7M martensite. In addition, the habit planes were revealed to possess a stepped structure, with the {1 0 1}A plane as the terrace and the {0 1 0}A plane as the step. The characteristic combination of martensite variants and the underlying mechanism of self-accommodation in the martensitic transformation have been analysed in terms of the minimum total transformation strain, where the deformation gradient matrix was constructed according to the experimentally determined orientation relationship between the two phases. The present results may deepen the understanding of special martensite microstructures during the martensitic transformation in ferromagnetic shape-memory alloys.
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36

Aleksei, Grunin, Maksimova Ksenia i Goikhman Aleksander. "The features of Ni2MnIn polycrystalline Heusler alloy thin films formation by pulsed laser deposition". Open Engineering 11, nr 1 (20.12.2020): 227–32. http://dx.doi.org/10.1515/eng-2021-0019.

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AbstractThe Ni-Mn-In-based Heusler alloys belong to the most studied intermetallic compounds due to a variety of physical effects inherent to them, including the shape memory and magnetocaloric effect, field-induced structural phase transition, and others. All of these properties are strongly depend on element concentrations, uniformity, and purity of the structure. Therefore, rather strict requirements are imposed on the synthesis technology of such samples.We report the dependencies of Ni-Mn-In polycrystalline thin film composition on growth parameters. It was shown that the composition mismatch between sample and target caused by the resputtering of the sample material with high-energy particles of the ablation plume, and the different ablation yields of elements from the target. The main deposition parameters demonstrated (Ar growth pressure, laser energies, substrate temperature and annealing, target-to-sample distance) for the co-deposition process to obtain the Ni-Mn-In Heusler alloy polycrystalline thin films with the martensitic transition.
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37

Norouzi-Inallu, M., P. Kameli, A. Ghotbi Varzaneh, I. Abdolhosseini Sarsari, M. Abbasi Eskandari, I. Orue, B. Rodríguez-Crespo i V. Chernenko. "Influence of W doping on the structure, magnetism and exchange bias in Ni47Mn40Sn13− x W x Heusler alloys". Journal of Physics: Condensed Matter 34, nr 22 (31.03.2022): 225803. http://dx.doi.org/10.1088/1361-648x/ac5311.

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Abstract The influence of the W-doping on the martensitic transformation, magnetic properties and exchange bias (EB) effect in the Ni47Mn40Sn13−x W x (x = 0, 0.5, 1, 1.25 at.%) magnetic shape memory alloys has been investigated. It is found that the W-doping causes a simultaneous reduction of both the ferromagnetic (FM) exchange coupling and enhancement of the magnetic anisotropy, leading to a decrease of the magnetic moment of the low-temperature phase and to a higher attainable EB. The magnetic memory measurements reveal the presence of a glassy magnetic ground state, which can significantly impact the reduction of magnetization and enhancement of EB in the studied bulk alloys. It is argued that the glassy magnetic ground state originates from the partial magnetic disorder resulting from the correlation between the antiferromagnetic and FM states. The results demonstrate that the doping by W instead of Sn is an efficient tool to tailor the EB effect in the Ni–Mn–Sn-based Heusler alloys, whereby they are promising for spintronic applications.
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38

Czaja, P., J. Przewoźnik, L. Hawelek, A. Chrobak, P. Zackiewicz i W. Maziarz. "Martensitic transformation, magnetic entropy, and adiabatic temperature changes in bulk and ribbon Ni48Mn39.5Sn12.5−xInx (x = 2, 4, 6) metamagnetic shape memory alloys". Journal of Materials Research, 30.08.2021. http://dx.doi.org/10.1557/s43578-021-00335-x.

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AbstractMartensitic transformation, magnetic entropy, and direct adiabatic temperature changes in Ni48Mn39.5Sn12.5−xInx (x = 2, 4, 6) metamagnetic Heusler bulk and grain-constrained ribbon alloys were studied. All alloys showed a typical L21 structure in austenite and the 4O structure in martensite. Their relative volume contributions changed depending on In content. With increasing In concentration, the martensitic transformation temperature increased, whereas the Curie temperature of austenite decreased. The magnetic entropy change under magnetic field of 5 T attained maximum of 20 J/kgK in the bulk and 14.4 J/kgK in the ribbon alloys with the Ni48Mn39.5Sn8.5In4 nominal composition. The corresponding adiabatic temperature change under 1.7 T yielded 1.3 K for the Ni48Mn39.5Sn8.5In4 bulk alloy. Despite grain confinement, melt spinning was found to stabilize martensite phase. Changes observed were discussed with relation to strengthened covalency imposed by In substitution. Graphic abstract
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39

Fink, Lukas, Satyakam Kar, Klara Lünser, Kornelius Nielsch, Heiko Reith i Sebastian Fähler. "Integration of Multifunctional Epitaxial (Magnetic) Shape Memory Films in Silicon Microtechnology". Advanced Functional Materials, 23.08.2023. http://dx.doi.org/10.1002/adfm.202305273.

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AbstractMagnetic shape memory alloys exhibit various multifunctional properties, which range from high stroke actuation and magnetocaloric refrigeration to thermomagnetic energy harvesting. Most of these applications benefit from miniaturization and a single crystalline state. Epitaxial film growth is so far only possible on some oxidic substrates, but they are expensive and incompatible with standard microsystem technologies. Here, epitaxial growth of Ni–Mn–based Heusler alloys with single crystal‐like properties on silicon substrates is demonstrated by using a SrTiO3 buffer. It is shown that this allows using standard microfabrication technologies to prepare partly freestanding patterns. This approach is versatile, as its applicability for the NiTi shape memory alloy is demonstrated and spintronic and thermoelectric Heusler alloys are discussed. This paves the way for integrating additional multifunctional effects into state‐of‐the‐art microelectronic and micromechanical technology, which is based on silicon.
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40

Yan, Hai-Le, Xiao-Ming Huang i Claude Esling. "Recent Progress in Crystallographic Characterization, Magnetoresponsive and Elastocaloric Effects of Ni-Mn-In-Based Heusler Alloys—A Review". Frontiers in Materials 9 (24.02.2022). http://dx.doi.org/10.3389/fmats.2022.812984.

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Ni-Mn-In-based magnetic shape memory alloys have promising applications in numerous state-of-the-art technologies, such as solid-state refrigeration and smart sensing, resulting from the magnetic field-induced inverse martensitic transformation. This paper aims at presenting a comprehensive review of the recent research progress of Ni-Mn-In-based alloys. First, the crystallographic characterization of these compounds that strongly affects functional behaviors, including the crystal structure of modulated martensite, the self-organization of martensite variants and the strain path during martensitic transformation, are reviewed. Second, the current research progress in functional behaviors, including magnetic shape memory, magnetocaloric and elastocaloric effects, are summarized. Finally, the main bottlenecks hindering the technical development and some possible solutions to overcome these difficulties are discussed. This review is expected to provide some useful insights for the design of novel advanced magnetic shape memory alloys.
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41

Aksoy, S., M. Acet, P. P. Deen, L. Mañosa i A. Planes. "Magnetic correlations in martensitic Ni-Mn-based Heusler shape-memory alloys: Neutron polarization analysis". Physical Review B 79, nr 21 (3.06.2009). http://dx.doi.org/10.1103/physrevb.79.212401.

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42

Entel, Peter, Mario Siewert, Antje Dannenberg, Markus Ernst Gruner i Manfred Wuttig. "New Functional Magnetic Shape Memory Alloys from First-Principles Calculations". MRS Proceedings 1200 (2009). http://dx.doi.org/10.1557/proc-1200-g04-01.

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AbstractAn overview is given of new ferromagnetic Heusler alloys like Ni-Co-(Al, Ga, Zn), Co-Ni-(Al, Ga, Zn), Fe-Ni-(Al, Ga, Zn) and Fe-Co-(Al, Ga, Zn), which are compared with today's mostly investigated systems such as Ni-Mn-Z (Z = Al, Ga, In, Sn, Sb). The investigations are based on first-principles as well as Monte Carlo calculations. For some new systems, the simulations of atomic structure and magnetic and electronic properties allow to predict higher Curie and martensitic transformation temperatures than those of prototypical Ni-Mn-Z materials. Some of the new materials may be distinguished for devices which exploit the magnetic shape memory effect. Interestingly, in general, all off-stoichiometric alloys display competing antiferromagnetic correlations, which may be important for devices using the magnetocaloric effect. The Curie temperatures are obtained from Monte Carlo simulations using magnetic exchange parameters from ab initio calculations while the structural instability is inferred from local minima in the ab initio total energy curves as a function of the tetragonal distortion. The manifestation of phonon softening as a precursor of structural transformations is present in the austenitic phase of most of the calculated ferromagnetic shape-memory alloys. However, quite remarkably, we find that phonon softening is absent in a few systems such as Co2NiGa.
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Nayak, A. K., C. Salazar Mejia, S. W. D'Souza, S. Chadov, Y. Skourski, C. Felser i M. Nicklas. "Large field-induced irreversibility in Ni-Mn based Heusler shape-memory alloys: A pulsed magnetic field study". Physical Review B 90, nr 22 (31.12.2014). http://dx.doi.org/10.1103/physrevb.90.220408.

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Janovec, Jozef, Martin Zelený, Oleg Heczko i Andrés Ayuela. "Localization versus delocalization of d-states within the $$\hbox {Ni}_{{2}}$$MnGa Heusler alloy". Scientific Reports 12, nr 1 (29.11.2022). http://dx.doi.org/10.1038/s41598-022-23575-1.

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AbstractWe present calculations based on density-functional theory with improved exchange-correlation approaches to investigate the electronic structure of $$\hbox {Ni}_2$$ Ni 2 MnGa magnetic shape memory alloy prototype. We study the effects of hybrid functionals as well as a Hubbard-like correction parameter U on the structural, electronic and magnetic properties of the alloy. We show that the previously successful application of U on Mn should be extended by including U on Ni to describe the d localized electrons more accurately and in better agreement with experiments. The bonding interactions within this intermetallic alloy are analysed including the role of non-transition metal. We found that the strongest and most stabilizing bond is formed between the Ga–Ni pairs due to the delocalized s–s and p–s orbital hybridization. Our findings suggest that minimization of the over-delocalization error introduced by standard semi-local exchange-correlation functionals leads to a better description of the $$\hbox {Ni}_2$$ Ni 2 MnGa alloy. Furthermore we propose that the experimental total magnetic moment of Ni–Mn–Ga alloys could be increased after carefully selected heat treatment procedures.
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