Magnetic and magnetocaloric properties of Co 2-x Fe x VGa Heusler alloys

K. Schroeder, J. Waybright, P. Kharel, W. Zhang, S. Valloppilly, J. Herran, P. Lukashev, Y. Huh, R. Skomski, D. J. Sellmyer

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Abstract

The magnetic and magnetocaloric properties of iron-substituted Co 2 VGa alloys, Co 2-x Fe x VGa (x = 0, 0.1, 0.15, 0.2, 0.3), were investigated. The Fe-substituted samples, prepared by arc melting, melt spinning, and annealing, crystallized in the L2 1 Heusler structure, without any secondary phases. The Curie temperature and high-field magnetization at 50 K decreased from 345 K and 44 emu/g (1.90 μ B /f.u.) for Co 2 VGa to 275 K and 39 emu/g (1.66 μ B /f.u.) for Co 1.7 Fe 0.3 VGa, respectively, but the maximum entropy change remained almost insensitive to Fe concentration for x ≤ 0.2, the highest value being 3.3 J/kgK at 7 T for Co 1.85 Fe 0.15 VGa. First-principle calculations show that Co 2 VGa retains its half-metallic band structure until at least 30% of the cobalt atoms are replaced by Fe atoms. The wide operating temperature window near room temperature and the lack of thermal and magnetic hysteresis are the interesting features of these materials for application in room-temperature magnetic refrigeration.

Original languageEnglish (US)
Article number056431
JournalAIP Advances
Volume8
Issue number5
DOIs
StatePublished - May 1 2018

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magnetic properties
arc melting
melt spinning
room temperature
operating temperature
atoms
Curie temperature
cobalt
hysteresis
entropy
iron
magnetization
annealing

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Schroeder, K., Waybright, J., Kharel, P., Zhang, W., Valloppilly, S., Herran, J., ... Sellmyer, D. J. (2018). Magnetic and magnetocaloric properties of Co 2-x Fe x VGa Heusler alloys AIP Advances, 8(5), [056431]. https://doi.org/10.1063/1.5006646

Magnetic and magnetocaloric properties of Co 2-x Fe x VGa Heusler alloys . / Schroeder, K.; Waybright, J.; Kharel, P.; Zhang, W.; Valloppilly, S.; Herran, J.; Lukashev, P.; Huh, Y.; Skomski, R.; Sellmyer, D. J.

In: AIP Advances, Vol. 8, No. 5, 056431, 01.05.2018.

Research output: Contribution to journalArticle

Schroeder, K, Waybright, J, Kharel, P, Zhang, W, Valloppilly, S, Herran, J, Lukashev, P, Huh, Y, Skomski, R & Sellmyer, DJ 2018, ' Magnetic and magnetocaloric properties of Co 2-x Fe x VGa Heusler alloys ', AIP Advances, vol. 8, no. 5, 056431. https://doi.org/10.1063/1.5006646
Schroeder K, Waybright J, Kharel P, Zhang W, Valloppilly S, Herran J et al. Magnetic and magnetocaloric properties of Co 2-x Fe x VGa Heusler alloys AIP Advances. 2018 May 1;8(5). 056431. https://doi.org/10.1063/1.5006646
Schroeder, K. ; Waybright, J. ; Kharel, P. ; Zhang, W. ; Valloppilly, S. ; Herran, J. ; Lukashev, P. ; Huh, Y. ; Skomski, R. ; Sellmyer, D. J. / Magnetic and magnetocaloric properties of Co 2-x Fe x VGa Heusler alloys In: AIP Advances. 2018 ; Vol. 8, No. 5.
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N2 - The magnetic and magnetocaloric properties of iron-substituted Co 2 VGa alloys, Co 2-x Fe x VGa (x = 0, 0.1, 0.15, 0.2, 0.3), were investigated. The Fe-substituted samples, prepared by arc melting, melt spinning, and annealing, crystallized in the L2 1 Heusler structure, without any secondary phases. The Curie temperature and high-field magnetization at 50 K decreased from 345 K and 44 emu/g (1.90 μ B /f.u.) for Co 2 VGa to 275 K and 39 emu/g (1.66 μ B /f.u.) for Co 1.7 Fe 0.3 VGa, respectively, but the maximum entropy change remained almost insensitive to Fe concentration for x ≤ 0.2, the highest value being 3.3 J/kgK at 7 T for Co 1.85 Fe 0.15 VGa. First-principle calculations show that Co 2 VGa retains its half-metallic band structure until at least 30% of the cobalt atoms are replaced by Fe atoms. The wide operating temperature window near room temperature and the lack of thermal and magnetic hysteresis are the interesting features of these materials for application in room-temperature magnetic refrigeration.

AB - The magnetic and magnetocaloric properties of iron-substituted Co 2 VGa alloys, Co 2-x Fe x VGa (x = 0, 0.1, 0.15, 0.2, 0.3), were investigated. The Fe-substituted samples, prepared by arc melting, melt spinning, and annealing, crystallized in the L2 1 Heusler structure, without any secondary phases. The Curie temperature and high-field magnetization at 50 K decreased from 345 K and 44 emu/g (1.90 μ B /f.u.) for Co 2 VGa to 275 K and 39 emu/g (1.66 μ B /f.u.) for Co 1.7 Fe 0.3 VGa, respectively, but the maximum entropy change remained almost insensitive to Fe concentration for x ≤ 0.2, the highest value being 3.3 J/kgK at 7 T for Co 1.85 Fe 0.15 VGa. First-principle calculations show that Co 2 VGa retains its half-metallic band structure until at least 30% of the cobalt atoms are replaced by Fe atoms. The wide operating temperature window near room temperature and the lack of thermal and magnetic hysteresis are the interesting features of these materials for application in room-temperature magnetic refrigeration.

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