Faculty Publications
Magnetic And Magnetocaloric Properties Of Co2-Xfexvga Heusler Alloys
Document Type
Article
Journal/Book/Conference Title
AIP Advances
Volume
8
Issue
5
Abstract
The magnetic and magnetocaloric properties of iron-substituted Co2VGa alloys, Co2-xFexVGa (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 L21 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 μB/f.u.) for Co2VGa to 275 K and 39 emu/g (1.66 μB/f.u.) for Co1.7Fe0.3VGa, 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 Co1.85Fe0.15VGa. First-principle calculations show that Co2VGa 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.
Department
Department of Physics
Original Publication Date
5-1-2018
DOI of published version
10.1063/1.5006646
Repository
UNI ScholarWorks, Rod Library, University of Northern Iowa
Language
en
Recommended Citation
Schroeder, K.; Waybright, J.; Kharel, P.; Zhang, W.; Valloppilly, S.; Herran, J.; Lukashev, P.; Huh, Y.; Skomski, R.; and Sellmyer, D. J., "Magnetic And Magnetocaloric Properties Of Co2-Xfexvga Heusler Alloys" (2018). Faculty Publications. 716.
https://scholarworks.uni.edu/facpub/716
