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

Kharel, Parashu; Lehmann, Zachary; Baker, Gavin; Stuelke, Lukas; Valloppilly, Shah; Shand, Paul M.; Lukashev, Pavel V.

doi:10.1063/9.0000395

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

Journal Article · Thu Jan 19 00:00:00 EST 2023 · AIP Advances

DOI:https://doi.org/10.1063/9.0000395· OSTI ID:2425428

^[1]; Lehmann, Zachary ^[1]; ^[1]; Stuelke, Lukas ^[2]; ^[3]; ^[2]; ^[2]

South Dakota State Univ., Brookings, SD (United States)
University of Northern Iowa, Cedar Falls, IA (United States)
Univ. of Nebraska, Lincoln, NE (United States)

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_1.25Fe_0.75VGe, Co_0.75Fe_1.25VGe, and CoFe_0.75VGe, respectively.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC)

Grant/Contract Number:: SC0012704

OSTI ID:: 2425428

Journal Information:: AIP Advances, Journal Name: AIP Advances Journal Issue: 1 Vol. 13; ISSN 2158-3226

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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