First-principles investigation of the L21 and XA ordering competition in Co2 FeAl Heusler alloy

Ahmad, Aquil; Guchhait, Suman; Ahmad, Hafiz; Srivastava, Suneel Kumar; Das, A. K.

doi:10.1063/1.5122450

Cited by 2 publications

(1 citation statement)

References 10 publications

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“…Heusler alloys (HAs) are materials of enormous interest due to their multifunctional properties including magnetoresistance (MR) [1], half-metallicity (i.e. 100 spin polarization at the Fermi edge) [2][3][4][5][6][7], spin filtering [8], spin injection [9], shape memory [10,11] and thermoelectric effect [12]. These half-metallic ferromagnets exhibit a unique band structure at the Fermi energy (E F ), where one spin channel shows metallic nature and another spin channel displays a non-conducting or semiconducting gap.…”

Section: Introductionmentioning

confidence: 99%

Giant magnetocaloric effect in Co₂FeAl Heusler alloy nanoparticles

Ahmad¹,

Mitra²,

Srivastava³

et al. 2021

J. Phys. D: Appl. Phys.

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A giant magnetocaloric effect across the ferromagnetic (FM) to paramagnetic (PM) phase transition was observed in chemically synthesized Co2FeAl Heusler alloy nanoparticles with a mean diameter of 16 nm. In our previous report, we observed a significant enhancement in its saturation magnetization (M s) and Curie temperature (T c) as compared with the bulk counterpart. Motivated by those results, we aim here to explore the magnetocaloric properties near the T c. The magnetic entropy change () shows a positive anomaly at 1252 K. increases linearly with the magnetic field, and a large value of ∼15 J kg−1 K−1 is detected under a moderate field of 14 kOe. It leads to a net relative cooling power of 89 J kg−1 for the magnetic field change of 14 kOe. To confirm the nature of magnetic phase transition, a detailed study of its magnetization is performed. The Arrott plot and nature of universal curve conclude that the FM to PM phase transition in the present system is of second-order.

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Section: Introductionmentioning

confidence: 99%

Giant magnetocaloric effect in Co₂FeAl Heusler alloy nanoparticles

Ahmad¹,

Mitra²,

Srivastava³

et al. 2021

J. Phys. D: Appl. Phys.

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Phase stability and the effect of lattice distortions on electronic properties and half-metallic ferromagnetism of Co₂FeAl Heusler alloy: an ab initio study

Ahmad

Srivastava²,

Das³

2020

J. Phys.: Condens. Matter

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Density functional theory calculations within the generalized gradient approximation (GGA) are employed to study the ground state of Co2FeAl. Various magnetic configurations are considered to find out its most stable phase. The ferromagnetic ground state of the Co2FeAl is energetically observed with an optimized lattice constant of 5.70 Å. After that, the system was subjected under uniform and non-uniform strains, to see their effects on spin polarization (P) and half-metallicity. The effect of spin-orbit coupling is considered in the present study. Halfmetallicity (and 100 % P) is retained only under uniform strains started from 0 to +4%, and dropped rapidly from 90% to 16% for the negative strains started from -1% to -6%. We find that the present system is much sensitive under tetragonal distortions as half-metallicity (and 100% P) is preserved only for the cubic case. The main reason for the loss of half-metallicity is due to the shift of the bands with respect to the Fermi level (EF). We also discuss the influence of these results on spintronics devices.

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First-principles investigation of the L21 and XA ordering competition in Co2 FeAl Heusler alloy

Cited by 2 publications

References 10 publications

Giant magnetocaloric effect in Co₂FeAl Heusler alloy nanoparticles

Giant magnetocaloric effect in Co₂FeAl Heusler alloy nanoparticles

Phase stability and the effect of lattice distortions on electronic properties and half-metallic ferromagnetism of Co₂FeAl Heusler alloy: an ab initio study

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First-principles investigation of the L21 and XA ordering competition in Co2 FeAl Heusler alloy

Cited by 2 publications

References 10 publications

Giant magnetocaloric effect in Co2FeAl Heusler alloy nanoparticles

Giant magnetocaloric effect in Co2FeAl Heusler alloy nanoparticles

Phase stability and the effect of lattice distortions on electronic properties and half-metallic ferromagnetism of Co2FeAl Heusler alloy: an ab initio study

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Product

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Giant magnetocaloric effect in Co₂FeAl Heusler alloy nanoparticles

Giant magnetocaloric effect in Co₂FeAl Heusler alloy nanoparticles

Phase stability and the effect of lattice distortions on electronic properties and half-metallic ferromagnetism of Co₂FeAl Heusler alloy: an ab initio study