The Magnetic and Curie Temperature Investigations of Co2NbGa Full Heusler Alloy with EFT Method


Doğruer S., Özdemir E. G., Merdan Z.

3rd International Conference on Applied Engineering and Natural Sciences, Konya, Turkey, 20 - 23 July 2022, pp.1238

  • Publication Type: Conference Paper / Summary Text
  • City: Konya
  • Country: Turkey
  • Page Numbers: pp.1238
  • Gazi University Affiliated: Yes

Abstract

In this study, the total and partial magnetism and phase transform temperature properties of Co2NbGa Full Heusler half-metallic ferromagnet alloy were investigated with Effective Field Theory (EFT) developed by Kaneyoshi [1,2]. The research involved temperature dependence of total and partial magnetizations and M-H examinations. Shell and core interactions of each component were considered in the data results. First, the atomic positions of atoms Co, Nb, and Ga have located a, b, c =0.5 a0 Wyckoff positions, and M – T and M – H examinations were performed with a total of 1000, and 2000 steps, respectively. The program performed 50 sub-calculations for each step and chose the best result. Second, Coshell, Cocore, Nb, Ga, bMtCo, bMTCo2NbGa and bMTICo2NbGa parameters gained with M-T actions 4.74309E-6, 3.17012E-6, 1.90929E-7, 6.12596E-8, 7.9132E-6, 8.16539E-6 and 1.20752E-05, respectively. Then the total magnetic moment was obtained as 2.00 μB/f.u. Partial magnetic contributions of Cos, Coc, Nb, and Ga were calculated, and most contributions originated from Cos. Finally, the magnetic phase transforms of Co2NbGa alloy were observed at Tc= 351 K Curie temperature using the EFT method. This result is in full agreement with the experimental value obtained [3]. Additionally, the Curie temperature of Co2NbGa alloy was theoretically obtained as 451 K [4,5]. The magnetic properties obtained in EFT studies of Co2NbGa full Heusler compound obtained in the literature studies were fully compatible.