Spin-wave stiffness and micromagnetic exchange interactions expressed by means of the KKR Green function approach

Mankovsky, S.; Polesya, S. and Ebert, H. (2019): Spin-wave stiffness and micromagnetic exchange interactions expressed by means of the KKR Green function approach. In: Physical Review B, Vol. 99, No. 10, 104427

Abstract

We represent an approach to calculate micromagnetic model parameters such as the tensor of exchange stiffness, Dzyaloshinskii-Moriya interaction (DMI), as well as spin-wave stiffness. The scheme is based on the fully relativistic Korringa-Kohn-Rostoker Green function (KKR-GF) technique and can be seen as a relativistic extension of the work of Lichtenstein et al. [J. Magn. Magn. Mater. 67, 65 (1987)]. The expression for D-z alpha elements of DMI differ from the expressions for D-x alpha and D-y alpha elements as the former are derived via second-order perturbation term of the energy caused by spin-spiral while the latter are associated with the first-order term. Corresponding numerical results are compared with those obtained using other schemes reported in the literature.

• Item Type: Journal article
• Faculties: Chemistry and Pharmacy > Department of Chemistry
• Subjects: 500 Science > 540 Chemistry
• ISSN: 2469-9950
• Language: English