SAIP2025

The effect of Ir on the magnetic and electronic properties of FePt alloy: A DFT study

Not scheduled

20m

Solomon Mahlangu House (University of the Witwatersrand, Johannesburg)

Poster Presentation Track A - Physics of Condensed Matter and Materials Poster Session

Speaker

Mashilo Matlala (University of Limpopo)

Description

L1₀-ordered FePt alloy is a promising material for high-density magnetic recording media due to its high magnetic anisotropy energy, density and coercivity. However, it was reported that this alloy faces challenges including issues with thermal stability and noise. Hence, ternary alloying with Ir was conducted to enhance the stability in response to the orientation of the magnetic spin moment of the binary FePt system. The structural, magnetic electronic and thermal properties of L1₀-ordered Fe₅₀Pt_50-xIr_x alloys (0≤x≤25) were studied using the Density Functional Theory. It was found that the lattice parameters and magnetic moments of the binary Fe₅₀Pt₅₀ are well in agreement with previous theoretical and experimental data to within 5 %. In all Fe₅₀Pt_50-xIr_x alloys, the calculated heats of formation were negative, demonstrating their thermodynamic stability. The magnetic moments and density of states were determined to evaluate the magnetic behaviour of Fe50Pt50-xIrx alloys. These results contribute to the development of Fe₅₀Pt_50-xIr_x alloys as the next generation of magnets for high-density magnetic recording media.