Issue 15, 2025, Issue in Progress

Half metal-to-metal transition and superior transport response with a very high Curie-temperature in CoFeRuSn: strain regulations

Abstract

Magnetic materials with a high Curie temperature (TC) and superior transport behavior are interesting prospects for spintronics and energy conversion devices. The present investigation deals with various traits of the CoFeRuSn quaternary Heusler alloy that were examined under strain (biaxial [110]/hydrostatic [111]) using first-principles calculations. The T1 phase is the ground state configuration relative to the T2 and T3 ones, which is thermodynamically stable owing to a negative formation enthalpy (ΔHf) and high cohesive energy (Ecoh.). It is established that the material exhibits a half-metallic (HM) ferromagnetic (FM) phase holding an energy gap of 0.42 eV in the spin-minority channel. Moreover, Co/Fe/Ru has spin moment of 1.59/3.13/0.53 μB with electronic configuration of (3d7) t32g↑t32g↓e1g↑e0g↓/(3d6) t32g↑t32g↓e2g↑e0g↓/(4d5) t32g↑t22g↓e0g↑e0g↓ employing Image ID:d5ra01305d-t1.gif which is further confirmed by spin-magnetization density isosurfaces. Exceptionally, a giant TC of 779 K further enhances its potential for practical realization. Additionally, a large figure of merit (ZT) of 0.93 and n-type carriers indicates a good thermoelectric performance of the material. Surprisingly, a HM-to-metal transition occurs at −4% in both types of compressive strains. Furthermore, ZT reaches ∼1.0 under applied strains, whereas TC increases by 11% for −5% strain. Hence, this study demonstrates that the CoFeRuSn motif contains multifunctional aspects, enhancing its potential for various applications in spintronics and thermoelectric energy harvesting.

Graphical abstract: Half metal-to-metal transition and superior transport response with a very high Curie-temperature in CoFeRuSn: strain regulations

Associated articles

Supplementary files

Article information

Article type
Paper
Submitted
23 Feb 2025
Accepted
20 Mar 2025
First published
11 Apr 2025
This article is Open Access
Creative Commons BY license

RSC Adv., 2025,15, 11511-11522

Half metal-to-metal transition and superior transport response with a very high Curie-temperature in CoFeRuSn: strain regulations

F. Rani, B. F. Felemban, H. T. Ali and S. Nazir, RSC Adv., 2025, 15, 11511 DOI: 10.1039/D5RA01305D

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