Magnetism, band gap and stability of half-metallic property for the quaternary Heusler alloys CoFeTiZ (Z = Si, Ge, Sn)

Zhang, Yajiu; Liu, Z.H.; Li, G.T.; Ma, Xingqiao; Liu, G.D.

doi:10.1016/j.jallcom.2014.07.165

Cited by 83 publications

(23 citation statements)

References 30 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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“…This combination of the two binaries reminds one of the quaternary Heuslers of the type XX'YZ where atoms X, X' and Y are d ‐elements, the atom Z is a p ‐element with metallic character . Quaternary Heusler structures are mainly investigated as half‐metallic ferro‐magnets and are yet to be investigated from the viewpoint of hard magnetic materials.…”

Section: Introductionmentioning

confidence: 95%

L1₀ Stacked Binaries as Candidates for Hard‐Magnets: FePt, MnAl and MnGa

et al. 2017

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A novel strategy of stacking binary magnets to enhance the magneto crystalline anisotropy is explored. This strategy is used in the search for hard magnets by studying FePt/MnGa and FePt/MnAl stacks. The choice of these binaries is motivated by the fact that they already possess large magneto crystalline anisotropy. Several possible alternative structures for these materials are explored in order to reduce the amount of Pt owing to its high cost.

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“…CoFeTiZ (Z=Si, Ge, Sn) Heusler compounds by theoretical work of Zhang et al published in this journal[54]. half-metallic gap E HM , which is the minimum energy for the electron to change the spin, can be estimated and are ∼0 eV, 0.058 eV and 0.171 eV for CoRuFeSi, CoRuFeGe and CoRuFeSn, respectively.…”

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confidence: 99%