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Journal articles on the topic 'Ferromagnetic Heusler alloys'

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Published: 10 December 2022
Last updated: 29 January 2023

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1

Srivastava, Vijay, and Kanwal Preet Bhatti. "Ferromagnetic Shape Memory Heusler Alloys." Solid State Phenomena 189 (June 2012): 189–208. http://dx.doi.org/10.4028/www.scientific.net/ssp.189.189.

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Although Heusler alloys have been known for more than a century, but since the last decade there has been a quantum jump in research in this area. Heusler alloys show remarkable properties, such as ferromagnetic shape memory effect, magnetocaloric effect, half metallicity, and most recently it has been shown that it can be used for direct conversion of heat into electricity. Heusler alloys Ni-Mn-Z (Z=Ga, Al, In, Sn, Sb), show a reversible martensitic transformation and unusual magnetic properties. Other classes of intermetallic Heusler alloy families that are half metallic (such as the half Heusler alloys Ni-Mn-Sb and the full Heusler alloy Co2MnGe) are attractive because of their high Curie temperature and structural similarity to binary semiconductors. Unlike Ni-Mn-Ga, Ni-Mn-In and Ni-Mn-Sn transform from ferromagnetic austenite to non-ferromagnetic martensite. As is consistent with the Clausius-Clapeyron equation, the martensitic phase transformation can be manipulated by a magnetic field, leading to possible applications of these materials enabling the magnetic shape memory effect, energy conversion and solid state refrigeration. In this paper, we summarize the salient features of Heusler alloys, like the structure, magnetic properties and potential application of this family of alloys in industry.
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2

Sakon, Takuo, Yuhi Hayashi, Akihito Fukuya, Dexin Li, Fuminori Honda, Rie Umetsu, Xiao Xu, Gendo Oomi, Takeshi Kanomata, and Tetsujiro Eto. "Investigation of the Itinerant Electron Ferromagnetism of Ni2+xMnGa1−x and Co2VGa Heusler Alloys." Materials 12, no. 4 (February 14, 2019): 575. http://dx.doi.org/10.3390/ma12040575.

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Experimental investigations into the field dependence of magnetization and temperature dependences of magnetic susceptibility in Ni2+xMnGa1−x (x = 0.00, 0.02, 0.04) and Co2VGa Heusler alloy ferromagnets were performed following the spin fluctuation theory of itinerant ferromagnetism, called as “Takahashi theory”. We investigated the magnetic field dependence of magnetization at the Curie temperature TC, which is the critical temperature of the ferromagnetic–paramagnetic transition, and also at T = 5 K, which concerns the ground state of the ferromagnetic state. The field dependence of the magnetization was analyzed by means of the H vs. M5 dependence, and the field dependence of the ground state at 5 K was investigated by means of an Arrott plot (H/M vs. M2) according to the Takahashi theory. As for Ni2+xMnGa1−x, the spin fluctuation parameter in k-space (momentum space, TA) and that in energy space (T0) obtained at TC and 5 K were almost the same. On the contrary, as for Co2VGa, the H vs. M5 dependence was not shown at TC. We obtained TA and T0 by means of an Arrott plot at 5 K. We created a generalized Rhodes–Wohlfarth plot of peff/pS versus TC/T0 for the other ferromagnets. The plot indicated that the relationship between peff/pS and T0/TC followed Takahashi’s theory. We also discussed the spontaneous magnetic moment at the ground state, pS, which was obtained by an Arrott plot at 5 K and the high temperature magnetic moment, pC, at the paramagnetic phase. As for the localized ferromagnet, the pC/pS was 1. As for weak ferromagnets, the pC/pS was larger than 1. In contrast, the pC/pS was smaller than 1 by many Heusler alloys. This is a unique property of Heusler ferromagnets. Half-metallic ferromagnets of Co2VGa and Co2MnGa were in accordance with the generalized Rhodes–Wohlfarth plot with a km around 1.4. The magnetic properties of the itinerant electron of these two alloys appeared in the majority bands and was confirmed by Takahashi’s theory.
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3

Planes, Antoni, and Lluís Mañosa. "Ferromagnetic Shape-Memory Alloys." Materials Science Forum 512 (April 2006): 145–52. http://dx.doi.org/10.4028/www.scientific.net/msf.512.145.

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The magnetic shape-memory effect is a consequence of the coupling between magnetism and structure in ferromagnetic alloys undergoing a martensitic transformation. In these materials large reversible strains can be magnetically induced by the rearrangement of the martensitic twin-variant structure. Several Heusler and intermetallic alloys have been studied in connec- tion with this property. In this paper we will focus on the Ni-Mn-Ga Heusler alloy which is considered to be the prototypical magnetic shape-memory alloy. After a brief summary of the general properties of this class of materials, we will present recent results of relevance for the understanding of the effect of magnetism on the martensitic transformation. Finally, we will discuss the requirements for the occurrence of the magnetic shape-memory effect.
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4

Oogane, M., and S. Mizukami. "Tunnel magnetoresistance effect and magnetic damping in half-metallic Heusler alloys." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 369, no. 1948 (August 13, 2011): 3037–53. http://dx.doi.org/10.1098/rsta.2011.0011.

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Some full-Heusler alloys, such as Co 2 MnSi and Co 2 MnGe, are expected to be half-metallic ferromagnetic material, which has complete spin polarization. They are the most promising materials for realizing half-metallicity at room temperature owing to their high Curie temperature. We demonstrate a huge tunnel magnetoresistance effect in a magnetic tunnel junction using a Co 2 MnSi Heusler alloy electrode. This result proves high spin polarization of the Heusler alloy. We also demonstrate a small magnetic damping constant in Co 2 FeAl epitaxial film. The very high spin polarization and small magnetic constant of Heusler alloys will be a great advantage for future spintronic device applications.
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5

S, Aksoy, Posth O, Acet M, Meckenstock R, Lindner J, Farle M, and Wassermann E. F. "Ferromagnetic resonance in Ni-Mn based ferromagnetic Heusler alloys." Journal of Physics: Conference Series 200, no. 9 (January 1, 2010): 092001. http://dx.doi.org/10.1088/1742-6596/200/9/092001.

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6

Benichou, Boucif, Zakia Nabi, Badra Bouabdallah, and Halima Bouchenafa. "Structural, elastic, electronic and magnetic properties of quaternary Heusler alloy Cu2MnSi1-xAlx (x = 0 - 1): First-principles study." Revista Mexicana de Física 64, no. 2 (March 14, 2018): 135. http://dx.doi.org/10.31349/revmexfis.64.135.

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We investigate the structural, elastic, electronic and magnetic properties of the Heusler compounds Cu2MnSi, Cu2MnAl and Cu2MnSi1-xAlx quaternary alloys, using the full-potential linear-augmented plane-wave method (FP-LAPW) in the framework of the density functional theory (DFT) using the generalized gradient approximation of Perdew-Burke-Ernzerhof (GGA-PBE). Our results provide predictions for the quaternary alloy Cu2MnSi1-xAlx (x = 0.125, 0.25, 0.375, 0.5) in which no experimental or theoretical data are currently available. We calculate the ground state’s properties of Cu2MnSi1-xAlx alloys for both nonmagnetic and ferromagnetic configurations, which lead to ferromagnetic and metallic compounds. Also, the calculations of the elastic constants and the elastic moduli parameters show that these quaternary Heusler alloys are ductile and anisotropic.
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7

Entel, Peter, Markus E. Gruner, Antje Dannenberg, Mario Siewert, Sanjeev K. Nayak, Heike C. Herper, and Vasiliy D. Buchelnikov. "Fundamental Aspects of Magnetic Shape Memory Alloys: Insights from Ab Initio and Monte Carlo Studies." Materials Science Forum 635 (December 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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8

Ahamed, Riaz, Reza Ghomashchi, Zonghan Xie, and Lei Chen. "Powder Metallurgy Synthesis of Heusler Alloys: Effects of Process Parameters." Materials 12, no. 10 (May 15, 2019): 1596. http://dx.doi.org/10.3390/ma12101596.

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Ni45Co5Mn40Sn10 Heusler alloy was fabricated with elemental powders, using a powder processing route of press and sinter, in place of vacuum induction melting or arc melting route. The effects of process parameters, such as compaction load, sintering time, and temperature, on the transformation characteristics and microstructures of the alloy were investigated. While the effect of compaction pressure was not significant, those of sintering time and temperature are important in causing or annulling martensitic transformation, which is characteristic of Heusler alloys. The processing condition of 1050 °C/24 h was identified to be favorable in producing ferromagnetic Heusler alloy. Longer durations of sintering resulted in an increased γ-phase fraction, which acts as an impediment to the structural transformation.
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9

Tsuchiya, Koichi, Katsunari Oikawa, Takashi Fukuda, and Tomoyuki Kakeshita. "Ferromagnetic Shape Memory Alloys with Heusler Structure." Materia Japan 44, no. 8 (2005): 642–47. http://dx.doi.org/10.2320/materia.44.642.

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10

Wen, Zhenchao, Zhiyong Qiu, Sebastian Tölle, Cosimo Gorini, Takeshi Seki, Dazhi Hou, Takahide Kubota, Ulrich Eckern, Eiji Saitoh, and Koki Takanashi. "Spin-charge conversion in NiMnSb Heusler alloy films." Science Advances 5, no. 12 (December 2019): eaaw9337. http://dx.doi.org/10.1126/sciadv.aaw9337.

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Half-metallic Heusler alloys are attracting considerable attention because of their unique half-metallic band structures, which exhibit high spin polarization and yield huge magnetoresistance ratios. Besides serving as ferromagnetic electrodes, Heusler alloys also have the potential to host spin-charge conversion. Here, we report on the spin-charge conversion effect in the prototypical Heusler alloy NiMnSb. An unusual charge signal was observed with a sign change at low temperature, which can be manipulated by film thickness and ordering structure. It is found that the spin-charge conversion has two contributions. First, the interfacial contribution causes a negative voltage signal, which is almost constant versus temperature. The second contribution is temperature dependent because it is dominated by minority states due to thermally excited magnons in the bulk part of the film. This work provides a pathway for the manipulation of spin-charge conversion in ferromagnetic metals by interface-bulk engineering for spintronic devices.
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11

Volkova N. V., Chistyakov V. V., Patrakov E. I., Korenistov P. S., Perevalova A. N., and Emelyanova S. M. "Electrical resistance of Ni-=SUB=-42+x-=/SUB=-Mn-=SUB=-47-x-=/SUB=-Sn-=SUB=-11-=/SUB=- alloys." Physics of the Solid State 64, no. 3 (2022): 298. http://dx.doi.org/10.21883/pss.2022.03.53184.244.

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The electrical resistance and structure of Ni42+xMn47-xSn11 alloys have been studied; where x=0, 1, 2, 3, 4, At room temperature, Ni42+xMn47-xSn11 alloys are ordered in the cubic L21 Ni2MnSn structure characteristic of Heusler alloys. The phase transition between the cubic austenite phase and martensite with lower symmetry, characteristic of ferromagnetic non-stoichiometric Heusler alloys, is observed at temperatures below room temperature. It was found that the partial replacement of Mn atoms by Ni atoms leads to an increase in the phase transition temperatures and to their shift to room temperature. Keywords: Heusler alloys, electrical resistance, phase transition.
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12

Volkova N. V., Chistyakov V. V., Patrakov E. I., Korenistov P. S., Perevalova A. N., and Emelyanova S. M. "Electrical resistance of Ni-=SUB=-42+x-=/SUB=-Mn-=SUB=-47-x-=/SUB=-Sn-=SUB=-11-=/SUB=- alloys." Physics of the Solid State 64, no. 3 (2022): 310. http://dx.doi.org/10.21883/pss.2022.03.54698.244.

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The electrical resistance and structure of Ni42+xMn47-xSn11 alloys have been studied; where x=0, 1, 2, 3, 4, At room temperature, Ni42+xMn47-xSn11 alloys are ordered in the cubic L21 Ni2MnSn structure characteristic of Heusler alloys. The phase transition between the cubic austenite phase and martensite with lower symmetry, characteristic of ferromagnetic non-stoichiometric Heusler alloys, is observed at temperatures below room temperature. It was found that the partial replacement of Mn atoms by Ni atoms leads to an increase in the phase transition temperatures and to their shift to room temperature. Keywords: Heusler alloys, electrical resistance, phase transition.
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13

Palmstrøm, Chris. "Epitaxial Heusler Alloys: New Materials for Semiconductor Spintronics." MRS Bulletin 28, no. 10 (October 2003): 725–28. http://dx.doi.org/10.1557/mrs2003.213.

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AbstractFerromagnetic materials that have Curie temperatures above room temperature, crystal structures and lattice matching compatible with compound semiconductors, and high spin polarizations show great promise for integration with semiconductor spintronics. Heusler alloys have crystal structures (fcc) and lattice parameters similar to many compound semiconductors, high spin polarization at the Fermi level, and high Curie temperatures. These properties make them particularly attractive for injectors and detectors of spin-polarized currents. This review discusses the progress and issues related to integrating full and half Heusler alloys into ferromagnetic compound semiconductor heterostructures.
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14

Planes, Antoni, Lluís Mañosa, and Mehmet Acet. "Magnetocaloric effect in ferromagnetic Heusler shape-memory alloys." Journal of Physics: Conference Series 165 (May 1, 2009): 012050. http://dx.doi.org/10.1088/1742-6596/165/1/012050.

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15

Planes, Antoni, Marcel Porta, Teresa Castán, and Avadh Saxena. "Magnetostructural tweed in ferromagnetic Heusler shape-memory alloys." Materials Science and Engineering: A 438-440 (November 2006): 916–18. http://dx.doi.org/10.1016/j.msea.2006.02.113.

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16

Lakshmi, N., Ram Kripal Sharma, and K. Venugopalan. "Evidence of Clustering in Heusler like Ferromagnetic Alloys." Hyperfine Interactions 160, no. 1-4 (January 2005): 227–33. http://dx.doi.org/10.1007/s10751-005-9155-7.

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17

Yuhasz, W. M., D. L. Schlagel, Q. Xing, R. W. McCallum, and T. A. Lograsso. "Metastability of ferromagnetic Ni–Mn–Sn Heusler alloys." Journal of Alloys and Compounds 492, no. 1-2 (March 2010): 681–84. http://dx.doi.org/10.1016/j.jallcom.2009.12.016.

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18

Belkacem, K., Y. Zaoui, S. Amari, L. Beldi, and B. Bouhafs. "First-Principles Study of the New Half-Metallic Ferromagnetic Quaternary-Heusler Alloys NaXNO (X=Ca, Sr, Ba)." SPIN 10, no. 03 (August 19, 2020): 2050022. http://dx.doi.org/10.1142/s2010324720500228.

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The first-principles approach based on density functional theory (DFT) and the full-potential linearized augmented plane-wave method were employed to investigate the structural, elastic, electronic and magnetic properties of Na[Formula: see text]NO ([Formula: see text], Sr and Ba) quaternary half-Heusler alloys. The generalized gradient approximation (GGA) as parameterized by Perdew, Burke and Ernzerhof (PBE) and the modified Becke–Johnson exchange potential were used. As far as we know, we present our results which for the first time quantitatively account for the electronic structures and magnetic properties of Na[Formula: see text]NO ([Formula: see text], Sr and Ba) quaternary half-Heusler alloys. From the total energy calculation using three possible atomic configurations ([Formula: see text], [Formula: see text] and [Formula: see text]), it is found that the Na[Formula: see text]NO ([Formula: see text], Sr and Ba) quaternary half-Heusler alloys are more stable in the ferromagnetic [Formula: see text]-phase. From our estimated elastic constants [Formula: see text], it is found that all the considered Heusler alloys are mechanically stable in the [Formula: see text]-phase. We have also investigated the robustness of the half-metallicity with respect to the variation of lattice constants in these alloys. We have found that these alloys are half-metallic ferromagnets (HMFs) with a magnetic moment of 2[Formula: see text][Formula: see text] per formula unit at their equilibrium volumes. The spin-polarized electronic band structure and density of states of these quaternary half-Heusler alloys calculated by GGA (mBJ-GGA) show that the minority spin channels have metallic nature and the majority spin channels have a semiconductor character with half-metallic gaps of 0.49[Formula: see text]eV (2.17[Formula: see text]eV), 0.72[Formula: see text]eV (2.28[Formula: see text]eV) and 0.96[Formula: see text]eV (2.22[Formula: see text]eV) for NaCaNO, NaSrNO and NaBaNO quaternary half-Heusler alloys, respectively. Analysis of the density of states and the spin charge density of these quaternary alloys indicates that their magnetic moments mainly originate from the strong spin-polarization of 2[Formula: see text] states of N atoms and O atoms.
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19

Gharbi, F. N., I. E. Rabah, M. Rabah, H. Rached, D. Rached, N. Benkhettou, and F. Boukabrine. "Theoretical Studies of the Structural, Electronic and Magnetic Properties of the CoFeCeZ (Z = P, As and Sb) Quaternary Heusler Alloys." SPIN 10, no. 01 (December 23, 2019): 2050002. http://dx.doi.org/10.1142/s2010324720500022.

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In this paper, we investigate the structural, electronic and magnetic properties of CoFeCrZ ([Formula: see text], As,Sb) quaternary Heusler alloy, using the first-principles full potential linear muffin-tin orbital (FP-LMTO) method within the spin gradient generalized approximation (GGA) for the exchange and correlation potential. Our results demonstrate that in ferromagnetic phase, the all alloys CoFeCrZ are stable in type-1 configuration and are half-metallic ferromagnets (HMF) with gaps of 0.99[Formula: see text]eV, 0.57[Formula: see text]eV and 0.70[Formula: see text]Ev, respectively. The obtained negative formation energy shows that CoFeCrZ alloys have strong structural stability. The calculated total magnetic moment, [Formula: see text] for all alloys exhibit Slater-Pauling rule, [Formula: see text]. At zero pressure, the three alloys shown 100% spin-polarization at Fermi–level [Formula: see text] with high Curie temperatures [Formula: see text]. Our calculation indicate also that the half-metallicity and high magnetic moment of CoFeCrP, CoFeCrAs and CoFeCrSb are robust against the lattice compression (up to 7.80%, 5.40% and 11%, respectively). On the basis of these results, it is suggested that the CoFeCrZ Heusler could be suitable for spintronics devices applications.
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20

Sakon, Takuo, Junya Yamazaki, Takumi Komori, Takeshi Kanomata, Yasuo Narumi, Masayuki Hagiwara, Hiroyuki Nojiri, and Yoshiya Adachi. "The Forced Magnetostrictions and Magnetic Properties of Ni2MnX (X = In, Sn) Ferromagnetic Heusler Alloys." Materials 13, no. 9 (April 25, 2020): 2017. http://dx.doi.org/10.3390/ma13092017.

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Experimental studies into the forced magnetostriction, magnetization, and temperature dependence of permeability in Ni2MnIn and Ni2MnSn ferromagnetic Heusler alloys were performed according to the spin fluctuation theory of itinerant ferromagnetism proposed by Takahashi. We investigated the magnetic field (H) dependence of magnetization (M) at the Curie temperature TC, and at T = 4.2 K, which concerns the ground state of the ferromagnetic state. The M-H result at TC was analyzed by means of the H versus M5 dependence. At 4.2 K, it was investigated by means of an Arrott plot (H/M vs. M2) according to Takahashi’s theory. As for Ni2MnIn and Ni2MnSn, the spin fluctuation parameters in k-space (momentum space, TA) and that in energy space (frequency space, T0) obtained at TC and 4.2 K were almost the same. The average values obtained at TC and 4.2 K were TA = 342 K, T0 = 276 K for Ni2MnIn and TA = 447 K, T0 = 279 K for Ni2MnSn, respectively. The forced magnetostriction at TC was also investigated. The forced linear magnetostriction (ΔL/L) and the forced volume magnetostriction (ΔV/V) were proportional to M4, which followed Takahashi’s theory. We compared the forced volume magnetostriction ΔV/V and mechanical parameter, bulk modulus K. ΔV/V is inversely proportional to K. We also discuss the spin polarization of Ni2MnIn and other magnetic Heusler alloys. The pC/pS of Ni2MnIn was 0.860. This is comparable with that of Co2MnGa, which is a famous half-metallic alloy.
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21

Rahmoune, M., A. Chahed, A. Amar, H. Rozale, A. Lakdja, O. Benhelal, and A. Sayede. "The effect of pressure and alloying on half-metallicity of quaternary Heusler compounds CoMnYZ (Z = Al, Ga, and In)." Materials Science-Poland 34, no. 4 (December 1, 2016): 905–15. http://dx.doi.org/10.1515/msp-2016-0120.

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AbstractIn this work, first-principles calculations of the structural, electronic and magnetic properties of Heusler alloys CoMnYAl, CoMnYGa and CoMnYIn are presented. The full potential linearized augmented plane waves (FP-LAPW) method based on the density functional theory (DFT) has been applied. The structural results showed that CoMnYZ (Z = Al, Ga, In) compounds in the stable structure of type 1+FM were true half-metallic (HM) ferromagnets. The minority (half-metallic) band gaps were found to be 0.51 (0.158), 0.59 (0.294), and 0.54 (0.195) eV for Z = Al, Ga, and In, respectively. The characteristics of energy bands and origin of minority band gaps were also studied. In addition, the effect of volumetric and tetragonal strain on HM character was studied. We also investigated the structural, electronic and magnetic properties of the doped Heusler alloys CoMnYGa1−xAlx, CoMnYAl1−xInx and CoMnYGa1−xInx (x = 0, 0.25, 0.5, 0.75, 1). The composition dependence of the lattice parameters obeys Vegard’s law. All alloy compositions exhibit HM ferromagnetic behavior with a high Curie temperature (TC).
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22

Sakon, Yamasaki, Kodama, Kanomata, Nojiri, and Adachi. "The Characteristic Properties of Magnetostriction and Magneto-Volume Effects of Ni2MnGa-Type Ferromagnetic Heusler Alloys." Materials 12, no. 22 (November 6, 2019): 3655. http://dx.doi.org/10.3390/ma12223655.

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In this article, we review the magnetostriction and magneto-volume effects of Ni2MnGa-type ferromagnetic Heusler alloys at the martensitic, premartensitic, and austenitic phases. The correlations of forced magnetostriction (ΔV/V) and magnetization (M), using the self-consistent renormalization (SCR) spin fluctuation theory of an itinerant electron ferromagnet proposed by Takahashi, are evaluated for the ferromagnetic Heusler alloys. The magneto-volume effect occurs due to the interaction between the magnetism and volume change of the magnetic crystals. The magnetic field-induced strain (referred to as forced magnetostriction) and the magnetization are measured, and the correlation of magnetostriction and magnetization is evaluated. The forced volume magnetostriction ΔV/V at the Curie temperature, TC is proportional to M4, and the plots cross the origin point; that is, (M4, ΔV/V) = (0, 0). This consequence is in good agreement with the spin fluctuation theory of Takahashi. An experimental study is carried out and the results of the measurement agree with the theory. The value of forced magnetostriction is proportional to the valence electron concentration per atom (e/a). Therefore, the forced magnetostriction reflects the electronic states of the ferromagnetic alloys. The magnetostriction near the premartensitic transition temperature (TP) induces lattice softening; however, lattice softening is negligible at TC. The forced magnetostriction at TC occurs due to spin fluctuations of the itinerant electrons. In the martensitic and premartensitic phases, softening of the lattice occurs due to the shallow hollow (potential barrier) of the total energy difference between the L21 cubic and modulated 10M or 14M structures. As a result, magnetostriction is increased by the magnetic field.
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23

Wang, Changhai, Judith Meyer, Niclas Teichert, Alexander Auge, Elisabeth Rausch, Benjamin Balke, Andreas Hütten, Gerhard H. Fecher, and Claudia Felser. "Heusler nanoparticles for spintronics and ferromagnetic shape memory alloys." Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phenomena 32, no. 2 (March 2014): 020802. http://dx.doi.org/10.1116/1.4866418.

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24

Sofronie, M., F. Tolea, A. D. Crisan, B. Popescu, and M. Valeanu. "Magnetoelastic properties in polycrystalline ferromagnetic shape memory Heusler alloys." Procedia Structural Integrity 2 (2016): 1530–37. http://dx.doi.org/10.1016/j.prostr.2016.06.194.

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25

Webster, P. J., and K. R. A. Ziebeck. "Dynamic magnetic properties of ferromagnetic and antiferromagnetic Heusler alloys." Journal of Magnetism and Magnetic Materials 50, no. 1 (May 1985): 7–18. http://dx.doi.org/10.1016/0304-8853(85)90080-0.

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26

Kourov, N. I., V. V. Marchenkov, V. G. Pushin, and K. A. Belozerova. "Electrical properties of ferromagnetic Ni2MnGa and Co2CrGa Heusler alloys." Journal of Experimental and Theoretical Physics 117, no. 1 (July 2013): 121–25. http://dx.doi.org/10.1134/s1063776113080074.

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27

Huang, Haishen, Kun Yang, Wan Zhao, Tingyan Zhou, Xiude Yang, and Bo Wu. "High-Pressure-Induced Transition from Ferromagnetic Semiconductor to Spin Gapless Semiconductor in Quaternary Heusler Alloy VFeScZ (Z = Sb, As, P)." Applied Sciences 9, no. 14 (July 18, 2019): 2859. http://dx.doi.org/10.3390/app9142859.

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In this paper, the structure and the electronic and magnetic properties of VFeScZ (Z = Sb, As, P) series alloys are systematically studied based on the Perdew–Burke–Ernzerhof (PBE) generalized gradient approximation (GGA) calculation within the first-principles density functional theory. The results showed that VFeScSb and VFeScP are ferromagnetic semiconductors and VFeScAs exhibits half-metallic ferromagnetism under zero pressure. As the pressure increases, the narrow indirect gap of VFeScZ (Z = Sb, As, P) alloy gradually decreases, and gets close to zero, leading to spin gapless semiconductor (SGS) transition. The pressure phase transition point of VFeScSb, VFeScAs, and VFeScP alloy is 132 GPa, 58 GPa, and 32 GPa, respectively. As a result, the pressure effect provides an opportunity to tune the electronic properties of the alloys by external pressure. The present findings provide a technical method for us to actually use the Heusler alloy SGS.
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28

Özdemir, Evren G., and Semih Doğruer. "The electronic, half-metallic, elastic, and magnetic properties of new PtWZ (Z = In, Tl, Sn, and Pb) half-Heusler alloys via GGA and GGA+mBJ methods." Physica Scripta 96, no. 12 (December 1, 2021): 125869. http://dx.doi.org/10.1088/1402-4896/ac3fcd.

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Abstract The first-principle calculations of PtWZ (Z = In, Tl, Sn, and Pb) half-Heusler alloys were calculated by WIEN2k for GGA and GGA+mBJ methods. First, the ferromagnetic (FM) phases were obtained more energetically stable than non-magnetic (NM) and antiferromagnetic (AFM) phases in each alloy. The Curie temperatures of PtWIn, PtWTl, PtWSn, and PtWPb alloys were obtained as 286.98 K, 467.14 K, 721.98 K, and 1114.31 K, respectively, by utilizing the energy differences of the AFM and FM phases. In each method and alloy used, spin-up electrons showed metallic character. In the GGA method, PtW(In, Tl) alloys have direct band gaps of 0.72044 eV and 0.91488 eV in spin-down electrons, while PtW(Sn, Pb) alloys have indirect band gaps of 1.2558 eV and 1.11892 eV, respectively. In the GGA+mBJ method, the bandgap directions in all compounds remained the same. Here, band gaps in PtW(In, Tl, Sn, and Pb) alloys were obtained as 0.99918 eV, 1.15385 eV, 1.42676 eV, and 1.17497 eV, respectively. While the total magnetic moment values of PtW(In, Tl) half-Heusler alloys were obtained as 1.00 μ B/f.u., the total magnetic moments of PtW(Sn, Pb) alloys were obtained as 2.00 μ B/f.u. These results are in full agreement with the Slater-Pauling rule. According to elastic calculations, PtWIn, PtWTl, PtWSn, and PtWPb half-Heusler alloys are elastically stable and ductile.
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29

Buchelnikov, Vasiliy D., Vladimir V. Sokolovskiy, Mikhail A. Zagrebin, and Peter Entel. "The Magnetic States of Co- and Cr-Doped Ni-Mn-(In, Sn) Heusler Alloys." Advances in Science and Technology 97 (October 2016): 119–23. http://dx.doi.org/10.4028/www.scientific.net/ast.97.119.

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In this paper we report on the equilibrium magnetic and structural reference states of complex Cr doped Ni-Co-Mn-(In, Sn) Heusler alloys, which are studied from first-principles within the density functional theory. The off-stoichiometric compositions were treated by using the supercell approach. Three different ferrimagnetic and one ferromagnetic spin configurations were considered. The results of energy relaxation calculations have been averaged over different atomic distributions. It is found that Ni14Co2Mn11Cr1(In, Sn)4 the ferromagnetic (a ferrimagnetic) spin configuration in austenite (martensite) is energetically stable, respectively.
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30

Yan, Hai Le, Zong Bin Li, Chun Yang Zhang, Yu Dong Zhang, Claude Esling, Xiang Zhao, and Liang Zuo. "The Phase Transformation and Magnetic Properties in Ni-Mn-In Alloys." Advanced Materials Research 712-715 (June 2013): 54–57. http://dx.doi.org/10.4028/www.scientific.net/amr.712-715.54.

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The phase transformation and magnetic properties of Heusler-type Ni50Mn50-xInx(x=10~16) ferromagnetic shape-memory alloys have been systemically investigated by differential scanning calorimetry and vibrating sample magnetometry. It is found that the phase transition temperatures show a linear relationship with the In concentration and the curie temperatures of austenite phases are not sensitive to the alloy composition. The existence of large magnetization change during the magneto-structural transition is the origin of magnetic-field-induced transformation effect.
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31

Zagrebin, M. A., Vasiliy D. Buchelnikov, V. V. Sokolovskiy, I. A. Taranenko, and S. I. Saunina. "First Principles Calculations of Magnetic Exchange Parameters of Fe-Mn-Al Heusler Alloys." Solid State Phenomena 215 (April 2014): 131–36. http://dx.doi.org/10.4028/www.scientific.net/ssp.215.131.

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The composition dependences of magnetic exchange couplings for the cubic phase of Fe2+xMn1-xAl Heusler alloys, where 0.0 < x < 1.0 are obtained with the help of first principles calculations. Our simulations have shown that the Fe-Fe nearest neighbors present a strong ferromagnetic coupling. Moreover, these exchange interactions are larger than the other ones.
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32

Yang, Xiong, Ying Wang, Mingrun Du, and Wendi Zhang. "Probing Ferromagnetic Shape Memory Alloys in Pt-Based Heusler Compounds." Acta Physica Polonica A 139, no. 1 (January 2021): 8–13. http://dx.doi.org/10.12693/aphyspola.139.8.

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33

Amudhavalli, A., R. Rajeswarapalanichamy, and K. Iyakutti. "First principles study on Fe based ferromagnetic quaternary Heusler alloys." Journal of Magnetism and Magnetic Materials 441 (November 2017): 21–38. http://dx.doi.org/10.1016/j.jmmm.2017.05.029.

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34

Marchenkov, V. V., N. I. Kourov, K. A. Belozerova, S. M. Emelyanova, V. P. Dyakina, E. B. Marchenkova, M. Eisterer, and H. W. Weber. "Electronic transport in Co-based half-metallic ferromagnetic Heusler alloys." Journal of Physics: Conference Series 568, no. 5 (December 8, 2014): 052019. http://dx.doi.org/10.1088/1742-6596/568/5/052019.

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35

Khan, Mahmud, Naushad Ali, and Shane Stadler. "Inverse magnetocaloric effect in ferromagnetic Ni50Mn37+xSb13−x Heusler alloys." Journal of Applied Physics 101, no. 5 (March 2007): 053919. http://dx.doi.org/10.1063/1.2710779.

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36

Stetsenko, P. N., and V. V. Surikov. "The electron spin-density space distribution in ferromagnetic Heusler alloys." Hyperfine Interactions 80, no. 1-4 (March 1993): 945–51. http://dx.doi.org/10.1007/bf00567445.

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37

Erager K. R., Sokolovskiy V. V., and Buchelnikov V. D. "First-principle studies of the tendency towards segregation in Heusler alloys Ni-=SUB=-2-=/SUB=-Mn-=SUB=-1+x-=/SUB=-Sb-=SUB=-1-x-=/SUB=- with different atomic ordering." Physics of the Solid State 63, no. 13 (2022): 1600. http://dx.doi.org/10.21883/pss.2022.13.52297.11s.

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Using ab initio calculations, the stability issues of a series of Heusler alloys Ni2Mn1+xSb1-x (x=0, 0.25, 0.5, 0.75, 1) with staggered and layer-by-layer ordering of Mn atoms are investigated. It is shown that compositions with an excess of Mn are stable with respect to decomposition into constituent elements and unstable with respect to decomposition into a two-phase system consisting of a ferromagnetic cubic L21-phase Ni2MnSb and an antiferromagnetic tetragonal L10-phase NiMn. Thus, all nonstoichiometric compositions in the austenite and martensitic phases, taking into account different magnetic and atomic ordering, tend to segregate. Stability of alloys is possible only in stoichiometric compositions (x=0 and 1). Keywords: Heusler alloys, ab initio calculations, segregation, phase stability.
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38

Erager K. R., Sokolovskiy V. V., and Buchelnikov V. D. "First-principle studies of the tendency towards segregation in Heusler alloys Ni-=SUB=-2-=/SUB=-Mn-=SUB=-1+x-=/SUB=-Sb-=SUB=-1-x-=/SUB=- with different atomic ordering." Physics of the Solid State 63, no. 13 (2022): 2070. http://dx.doi.org/10.21883/pss.2022.13.53976.11s.

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Using ab initio calculations, the stability issues of a series of Heusler alloys Ni2Mn1+xSb1-x (x=0, 0.25, 0.5, 0.75, 1) with staggered and layer-by-layer ordering of Mn atoms are investigated. It is shown that compositions with an excess of Mn are stable with respect to decomposition into constituent elements and unstable with respect to decomposition into a two-phase system consisting of a ferromagnetic cubic L21-phase Ni2MnSb and an antiferromagnetic tetragonal L10-phase NiMn. Thus, all nonstoichiometric compositions in the austenite and martensitic phases, taking into account different magnetic and atomic ordering, tend to segregate. Stability of alloys is possible only in stoichiometric compositions (x=0 and 1). Keywords: Heusler alloys, ab initio calculations, segregation, phase stability.
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39

Adachi, Y., H. Morita, T. Kanomata, H. Yanagihashi, H. Yoshida, T. Kaneko, H. Fukumoto, H. Nishihara, M. Yamada, and T. Goto. "Pressure effects of the ferromagnetic Heusler alloy Rh2NiGe." Journal of Alloys and Compounds 419, no. 1-2 (August 2006): 7–10. http://dx.doi.org/10.1016/j.jallcom.2005.09.066.

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40

Benichou, B., H. Bouchenafa, Z. Nabi, and And B. Bouabdallah. "Ab initio investigation of the electronic structure, elastic and magnetic properties of quaternary Heusler alloy Cu2MnSn1-xInx (x = 0, 0.25, 0.5, 0.75, 1)." Revista Mexicana de Física 65, no. 5 Sept-Oct (September 2, 2019): 468. http://dx.doi.org/10.31349/revmexfis.65.468.

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Structural, elastic, electronic and magnetic properties of the quaternary Heusler alloys are calculated using the full-potential linearized augmented plane wave (FP-LAPW) method in the framework of the density functional theory (DFT) and implemented in WIEN2k code. The exchange-correlation potential is evaluated using the generalized gradient approximation (GGA) within the Perdew-Burke-Ernzerhof (PBE) parameterization. Our theoretically results provide predictions for the mixed in which no experimental and theoretical data are currently available. The lattice parameter and bulk modulus as well the elastic constants and their related elastic moduli for have been calculated. Also, the electronic properties including density of states and band structures indicate the metallic character for . Morever, this quaternary Heusler alloy is found to be ferromagnetic, ductile and anisotropic in nature.
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41

Kushwaha, Varun Kumar, Yuya Sakuraba, Tomoya Nakatani, Taisuke Sasaki, Ivan Kurniawan, Yoshio Miura, Hiroo Tajiri, and Kazuhiro Hono. "High L21-atomic ordering and spin-polarization in Co2MnZ (Z = Ge, Sn) Heusler thin films with low-temperature annealing process." APL Materials 10, no. 9 (September 1, 2022): 091119. http://dx.doi.org/10.1063/5.0117593.

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Although an enhanced magnetoresistance (MR) has been observed in many Co2-based Heusler alloys by promoting their structural ordering from B2 to L21 by post-annealing at higher temperatures ( Tann > 500 °C), it is desirable to search for other Heusler alloys that crystallize in L21-order below 300 °C, as the maximum Tann is restricted for processing devices. For Co2Mn Z ( Z = Ge, Sn) Heusler alloys, an L21-order is expected to appear even in the as-deposited state or by a low-temperature annealing process due to their very high L21 to B2-order transition temperature (>1500 K). Here, epitaxial Co2Mn Z films were grown on MgO (001) substrate at room temperature (RT) and post-annealed at Tann = 200–500 °C. Interestingly, as-sputtered films exhibit L21-ordering, which improves systematically upon increasing Tann. The spin-polarization of electric current ( β) was estimated at RT using nonlocal spin-valve (NLSV) devices by measuring the spin-accumulation signal in a copper (Cu) channel. It was found that at Tann = 300 °C, the β value of Co2MnGe films is higher (∼0.65) than that of Co2FeGe0.5Ga0.5 films due to a higher degree of L21-order, which makes the Co2MnGe alloy a promising ferromagnetic electrode for spintronic device applications.
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42

Prakash, Roshme, G. Suganya, and G. Kalpana. "Investigation of novel quaternary Heusler alloys XRuCrZ (X = Co, Ni, Rh, and Pd; Z = Si and Ge) via first-principles calculation for spintronics and thermoelectric applications." AIP Advances 12, no. 5 (May 1, 2022): 055223. http://dx.doi.org/10.1063/5.0088553.

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The structural, electronic, magnetic, and transport properties of LiMgPdSb-type novel quaternary Heusler alloys XRuCrZ (X = Co, Ni, Rh, and Pd; Z = Si and Ge) have been studied employing the first-principles calculation derived from density functional theory. From the total energy calculations, it is found that all these alloys are stable in the cubic α phase, and spin-polarized calculations show that all the alloys favor a ferromagnetic state. In addition, it is ascertained that XRuCrZ (X = Co and Rh; Z = Si and Ge) exhibits half-metallic ferromagnetic property. In addition, the temperature-dependent transport properties have been studied. The calculated dimensionless figure of merit for CoRuCrSi is 0.43. Our results show that these alloys will be suitable for data storage and energy conversion applications.
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43

Cai, Xin Le, Shan Dong Li, Mei Mei Liu, Jian Peng Wu, Yi Hu, Jie Qiu, and Jian Hua Lin. "Magnetoresistance and Exchange Bias Effect of (Co2MnSi)1-X-(NiO)X Nanocomposites." Advanced Materials Research 399-401 (November 2011): 620–24. http://dx.doi.org/10.4028/www.scientific.net/amr.399-401.620.

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The (Co2MnSi)1-x-(NiO)x(x = 0.0, 0.1, 0.2, 0.3) nanocomposites were fabricated by mechanical alloying using Co2MnSi Heusler alloy and NiO nanoparticles. It is revealed that antiferromagnetic NiO nanocrystallines dramatically enhances the magnetoresistance of the nanocomposites more than 20 times larger than that of the NiO-free Co2MnSi alloys at 300 K. The Exchange bias effect of the nanocomposites suggests that the spin-dependent tunneling and scattering at the interfaces of ferromagnetic/antiferromagnetic are responsible for the enhancement of the magnetoresistance.
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44

Chibueze, T. C., C. E. Ekuma, A. T. Raji, D. P. Rai, and C. M. I. Okoye. "Ferromagnetic half-metallicity in half-Heusler AuMnSn:Te Alloy." Materials Research Express 7, no. 7 (July 24, 2020): 076519. http://dx.doi.org/10.1088/2053-1591/ab88ff.

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45

Singh, R. K., M. Manivel Raja, P. Ghosal, and 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, no. 4 (June 28, 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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46

Dan, Nguyen Huy, and Nguyen Manh An. "Magnetic Properties and Giant Magnetocaloric Effect In Mn-based Heusler Compounds." Communications in Physics 23, no. 2 (June 10, 2013): 139. http://dx.doi.org/10.15625/0868-3166/23/2/2863.

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Magnetic properties and giant magnetocaloric effect (GMCE) of Mn-based Heusler compounds such as Co-Mn-Si, Ni-Mn-Sn, Ni-Mn-Sb have been investigated. The results show that the structure strongly influences on magnetic properties and GMCE of these alloys. The coexistence of ferromagnetic (FM) and antiferromagnetic (AFM) orders is observed. The magnetic phase transitions can be controlled by changing composition and annealing condition of the alloys. GMCEs with large magnitude and wide working temperature range have been obtained on these alloys showing their application potential for magnetic refrigeration technology.
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47

Sakon, Takuo, Yuushi Yamasaki, Yoshiya Adachi, Hiroyuki Nojiri, and Takeshi Kanomata. "Magnetostrictions of Ni2MnGa Type Ferromagnetic Heusler Alloys." Materia Japan 59, no. 1 (January 1, 2020): 21–25. http://dx.doi.org/10.2320/materia.59.21.

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48

Van An Dinh, K. Sato, and H. Katayama-Yoshida. "First Principle Materials Design of Half-Metallic Ferromagnetic Half-Heusler Alloys." IEEE Transactions on Magnetics 45, no. 6 (June 2009): 2663–66. http://dx.doi.org/10.1109/tmag.2009.2018951.

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49

Belhachi, S., and S. Amari. "A DFT study of the electronic and magnetic properties of Cu2Cr1−xVxGa alloys." International Journal of Computational Materials Science and Engineering 07, no. 04 (December 2018): 1850022. http://dx.doi.org/10.1142/s2047684118500227.

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We have investigated the electronic and magnetic properties of the doped Heusler alloys Cu2Cr[Formula: see text]V[Formula: see text]Ga ([Formula: see text], 0.5, and 1) using first-principles density functional theory within the generalized gradient approximation scheme. Lattice constants of all phases were determined, and the absence of energy gap in both the spin channels predicts that the materials are metallic. The calculated formation energies are negative, indicating stability of these compounds. Electronic structure and magnetic behavior are reported for the first time for the Cu2Cr[Formula: see text]V[Formula: see text]Ga alloy. It was found that the alloys are ferromagnetic, and metallic witch is confirmed by GGA[Formula: see text]U calculation.
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50

Arshad, Hafsa, M. Zafar, S. Ahmad, M. Rizwan, M. I. Khan, S. S. A. Gillani, Chuan Bao Cao, and M. Shakil. "Theoretical study of structural, electronic and magnetic properties of equiatomic quaternary CoPdCrZ (Z = Si, Ge, P) Heusler alloys." Modern Physics Letters B 33, no. 31 (November 10, 2019): 1950389. http://dx.doi.org/10.1142/s0217984919503895.

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In this study, the structural, electronic and magnetic properties of Co-based equiatomic quaternary Heusler alloys (EQHA) CoPdCrZ (Z = Si, Ge, P) are investigated by full potential linearized augmented plane wave (FP-LAPW) method. Three different configurations are employed to find out the most stable structure by structural optimization process. The alloys CoPdCrSi and CoPdCrGe are found to be stable in Type-II structure while CoPdCrP is in Type-I. The calculated electronic and magnetic properties show that CoPdCrSi and CoPdCrGe are nearly half metals while CoPdCrP is a ferromagnetic alloy. By following the Slater–Pauling rule [Formula: see text], the total magnetic moments are calculated. The spin polarization and Curie temperature have also been calculated.
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