Structural, mechanical, electronic and magnetic properties of a new series of quaternary Heusler alloys CoFeMnZ (Z=Si, As, Sb): A first-principle study

Elahmar, M.H.; Rached, H.; Rached, D.; Khenata, R.; Murtaza, G.; Omran, S. Bin; Ahmed, Waleed

doi:10.1016/j.jmmm.2015.05.019

Cited by 116 publications

(27 citation statements)

References 34 publications

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“…Since the first quaternary Heusler derivatives adopting the Y structure have been proposed to possess halfmetallic properties 72 , the interest in these materials has developed rapidly with numerous publications dealing with the topic. [10][11][12]70,71,[73][74][75][76][77][78][79][80][81][82][83][84][85][86][87] Density-functional theory calculations have been used to identify promising systems among the NiCo-, 10,11,70,71,[73][74][75] NiFe- 11,75,76 and CoFebased 12,72,77-87 compounds. However, in most cases the phase stability of the Y structure is tested, if at all, only against stacking order variations of this Y structure (see, for instance, Refs.…”

Section: Discussionmentioning

confidence: 99%

Ordering tendencies and electronic properties in quaternary Heusler derivatives

Neibecker

Gruner

et al. 2017

Phys. Rev. B

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The phase stabilities and ordering tendencies in the quaternary full-Heusler alloys NiCoMnAl and NiCoMnGa have been investigated by in-situ neutron diffraction, calorimetry and magnetization measurements. NiCoMnGa was found to adopt the L21 structure, with distinct Mn and Ga sublattices but a common Ni-Co sublattice. A second-order phase transition to the B2 phase with disorder also between Mn and Ga was observed at 1160 K. In contrast, in NiCoMnAl slow cooling or low-temperature annealing treatments are required to induce incipient L21 ordering, otherwise the system displays only B2 order. Linked to this L21 ordering, a drastic increase in the magnetic transition temperature was observed in NiCoMnAl, while annealing affected the magnetic behavior of NiCoMnGa only weakly due to the low degree of quenched-in disorder. First principles calculations were employed to study the thermodynamics as well as order-dependent electronic properties of both compounds. It was found that a near half-metallic pseudo-gap emerges in the minority spin channel only for the completely ordered Y structure, which however is energetically unstable compared to the predicted ground state of a tetragonal structure with alternating layers of Ni and Co. The experimental inaccessibility of the totally ordered structures is explained by kinetic limitations due to the low ordering energies.

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Section: Discussionmentioning

confidence: 99%

Ordering tendencies and electronic properties in quaternary Heusler derivatives

Neibecker

Gruner

et al. 2017

Phys. Rev. B

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“…i.e. CoFeMnZ (Z = As and Sb) by Elahmar et al [102], NiFeTiZ (Z= Si, P, Ge and As) by Karimian et al [103], CoFeScZ (Z = P, As and Sb) by Gao et al [104], CoMnTiZ (Z = P, As and Sb) by Khodami et al [105], NiCoCrGa by Gökhan et al [106],VCoHfGa and CrFeHfGa by Yang et al [107], and FeCrMnSb by Mukhtiyar et al [108]. The results of these calculations are summarized in the table 4.…”

Section: G Other Equiatomic Quaternary Heusler Alloysmentioning

confidence: 99%

Equiatomic quaternary Heusler alloys: A material perspective for spintronic applications

Bainsla

Суреш

2016

Applied Physics Reviews

263

104

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Half-metallic ferromagnetic (HMF) materials show high spin polarization and are therefore interesting to researchers due to their possible applications in spintronic devices. In these materials, while one spin sub band has a finite density of states at the Fermi level, the other sub band has a gap. Because of their high Curie temperature (TC) and tunable electronic been reported in a few systems, which are also discussed in this review. Thus, this review presents a consolidated picture of the magnetic and spintronic properties of this important, but relatively new class of Heusler alloys. It is expected that this will stimulate further interest in these alloys, thereby paving the way for the identification of more HMF and SGS materials. As a result of this, it is expected that more efficient spintronic devices using these alloys would emerge in the near future.

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“…Ductility of a compound is evaluated in terms of three parameters. The first is the Pugh's index [36] that is defined as the ratio of G/B. When G/B exceeds 0.5, it implies the compound is brittle.…”

Section: Thermodynamic Stabilitymentioning

confidence: 99%