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MA: Fachverband Magnetismus

MA 47: Poster III

MA 47.33: Poster

Donnerstag, 21. März 2024, 15:00–18:00, Poster D

Magnon-phonon interactions from first principles — •László Udvardi — Budapest University of Technology and Economics, Budapst, Hungary

Spintronics is an emerging field of recent solid state researches. In spintronics magnons hold great promise for quantum and classical information processing due to excellent scalability, tunability and energy-efficiency of magnonic devices. Among several important aspects of spin waves their interactions with phonons is one of the interesting area. Magnetic systems are often described by classical spin models. The exchange couplings, Dzyaloshinsky-Moriya interactions and magnetic anisotropy parameters appearing in the spin models can be determined from first principles. A recent review [1] discusses the most frequently used ab-initio methods. In point of view of magnon-phonon interactions the change of the exchange interactions against small displacement of the magnetic atoms have crucial importance.

In spirit of torque method we derived formulas for the change of the exchange couplings and magnetic anisotropy parameters with respect of small displacement of the atomic positions by means of multiple scattering theory. We have found a contribution which is not present in a recent paper by Mankovsky et al.[2]. The results are demonstrated on a Fe monolayer on surface of Au(001).

[1] A. Szilva et al., Rev. Mod. Phys. 95,035004 (2023)

[2] S. Mankovsky et al., Phys. Rev. Letter 129,067202 (2022)

Keywords: exchange coupling; ab-initio; magnetic anisotropy; magnon-phonon; derivatives of exchange copulings