Regensburg 2025 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

MA: Fachverband Magnetismus

MA 45: Computational Magnetism

MA 45.3: Talk

Friday, March 21, 2025, 10:00–10:15, H18

Origin of MAE and second order MAE due to the magnetostriction in tetragonal systems - FePt study — •Dominik Legut¹ and Pablo Nieves² — ¹IT4Innovations, VSB-TU Ostrava, Ostrava, Czechia — ²University of Oviedo, Oviedo, Spain

The origin of magnetocrystalline anisotropic energy (MAE) guided by spin-orbit coupling in the L1₀-FePt alloy was analyzed and the correlations among MAE and magnetoelastic (magnetostriction) constants b′s(λ′s) by means of the electronic structure eigenvalues (orbital energies) and eigenfunctions (orbital occupancies) were established[1]. Our numerical analysis includes the convolution of the projected wave-function (density of states) of each orbital of the Fe and Pt sub-lattices into their orbital energies and its contribution to the MAE,b′s, and λ′s. However, this corresponds to the zero strain situation. For a zero stress (realistic conditions used in experiments) situtation a very small correction is found for the first anisotropy constant Δ K₁/K₁ = 0.07%, while a much more significant contribution is obtained for the second one Δ K₂/K₂ = 21.86%. General analysis of this effect for tetragonal crystals is provided, finding that Δ K₁ will be always positive for any stable phase with this symmetry[2].
References:
1. T. Das, P. Nieves, D. Legut, J. Phys. D: Appl. Phys. 58, 035004 (2025)
2. D. Legut, P. Nieves, Solid State Sciences (accepted)

Keywords: magnetoelasticity; magnetostriction; magnetocrystalline anisotropy; ab initio