- Open Access
Finite-temperature enhancement of magnetic interactions from first principles
Phys. Rev. B 114, 165143 – Published 30 September, 2026
DOI: https://doi.org/10.1103/fh3c-61jn
Abstract
Density functional theory has demonstrated remarkable predictive power in calculating magnetic properties at zero temperature. At finite temperatures, thermally excited phonons affect magnetism. Efficient ab initio methods for calculating the temperature dependence of magnetic exchange interactions are still lacking despite the importance of room temperature magnetism for applications. Here we present a method to calculate the exchange interactions at finite temperatures from first principles using only two supercell calculations per temperature. Focusing on magnetic insulators, we find that magnetic exchange interactions decrease with temperature in NiO, while in a substantial temperature-induced enhancement of 10% at is uncovered. The exchange constant is governed by an interplay between metal-ligand hybridization, Hubbard repulsion, and the band gap. They all depend on equilibrium interatomic distances and bond angles, themselves modified by thermal phonons.
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