Structural, electronic, and magnetic properties of CoFeVGe-based compounds: Experiment and theory

Authors

Parashu Kharel, South Dakota State UniversityFollow
Zachary Lehmann, South Dakota State University
Gavin Baker, South Dakota State University
Lukas Stuelke, University of Northern Iowa
Shah R. Valloppilly, University of Nebraska - LincolnFollow
Paul M. Shand, University of Northern Iowa,
Pavel V. Lukashev, University of Northern Iowa,

ORCID IDs

Parashu Kharel https://orcid.org/0000-0001-7133-0718

Gavin Baker https://orcid.org/0000-0003-0474-574X

Shah Valloppilly https://orcid.org/0000-0001-6741-4281

Paul M. Shand https://orcid.org/0000-0002-2241-2634

Pavel V. Lukashev https://orcid.org/0000-0002-2551-5954

Date of this Version

2023

Citation

AIP Advances 13, 015217 (2023);

doi: 10.1063/9.0000395

Comments

© Author(s) 2023

Creative Commons Attribution (CC BY) license

Abstract

We have carried out a combined theoretical and experimental investigation of both stoichiometric and nonstoichiometric CoFeVGe alloys. In particular, we have investigated CoFeVGe, Co_1.25Fe_0.75VGe, Co_0.75Fe_1.25VGe, and CoFe_0.75VGe bulk alloys. Our first principles calculations suggest that all four alloys show ferromagnetic order, where CoFeVGe, Co_1.25Fe_0.75VGe, and Co_0.75Fe_1.25VGe are highly spin polarized with spin polarization values of over 80%. However, the spin polarization value of CoFe_0.75VGe is only about 60%. We have synthesized all four samples using arc melting and high-vacuum annealing at 600 °C for 48 hours. The room temperature x-ray diffraction of these samples exhibits a cubic crystal structure with disorder. All the samples show single magnetic transitions at their Curie temperatures, where the Curie temperature and high field (3T) magnetization are 288 K and 42 emu/g; 305 K and 1.5 emu/g; 238 K and 39 emu/g; and 306 K and 35 emu/g for CoFeVGe, Co_1.25Fe0.75VGe, Co_0.75Fe_1.25VGe, and CoFe_0.75VGe, respectively.