Magnetic and magnetocaloric properties of Co2-xFexVGa Heusler alloys

Authors

K. Schroeder, South Dakota State UniversityFollow
J. Waybright, South Dakota State UnviersityFollow
P. Kharel, South Dakota State UniversityFollow
W. Zhang, University of Nebraska, LincolnFollow
S. Valloppilly, University of Nebraska, LincolnFollow
J. Herran, University of Northern IowaFollow
P. Lukashev, University of Northern IowaFollow
Y. Huh, South Dakota State UniversityFollow
R. Skomsk, University of Nebraska, LincolnFollow
D. J. Sellmyer, University of Nebraska, LincolnFollow

Document Type

Article

Keywords

Condensed matter properties, Magnetic hysteresis, Phase transitions, Transition metals, Amorphous metals, Classical electromagnetism, Ab initio calculations, Entropy, Band structure

Journal/Book/Conference Title Title

AIP Advances

Volume

8

Issue

5

Abstract

The magnetic and magnetocaloric properties of iron-substituted Co₂VGa alloys, Co_2-xFe_xVGa (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 mu(B)/f.u.) for Co₂VGa to 275 K and 39 emu/g (1.66 mu(B)/f.u.) for Co_1.7Fe_0.3VGa, respectively, but the maximum entropy change remained almost insensitive to Fe concentration for x 1.85Fe_0.15VGa. 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. (c) 2018 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). https://doi.org/10.1063/1.5006646

Department

Department of Physics

Comments

First published in AIP Advances, v. 8 n. 5, 056431 (2018), published by American Institute of Physics. DOI: 10.1063/1.5006646

Original Publication Date

5-2018

DOI of published version

10.1063/1.5006646

Repository

UNI ScholarWorks, University of Northern Iowa, Rod Library

Copyright

©2018 K. Schroeder, J. Waybright, P. Kharel, W. Zhang, S. Valloppilly, J. Herran, P. Lukashev, Y. Huh, R. Skomski, and D. J. Sellmyer. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Date Digital

2018

Language

en

File Format

application/pdf

Recommended Citation

Schroeder, K.; Waybright, J.; Kharel, P.; Zhang, W.; Valloppilly, S.; Herran, J.; Lukashev, P.; Huh, Y.; Skomsk, R.; and Sellmyer, D. J., "Magnetic and magnetocaloric properties of Co2-xFexVGa Heusler alloys" (2018). Faculty Publications. 25.
https://scholarworks.uni.edu/phy_facpub/25