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MA: Fachverband Magnetismus

MA 2: Computational Magnetism I

MA 2.4: Vortrag

Montag, 18. März 2024, 10:15–10:30, H 1058

Spin wave transport in ferromagnetic and antiferromagnetic bilayers — •Moumita Kundu¹, Levente Rozsa², and Ulrich Nowak¹ — ¹Fachbereich Physik, Universität Konstanz, Konstanz, Germany — ²Wigner Research Center for Physics, Budapest, Hungary

Spin transport in magnetic insulators is crucial for spin-based multifunctional devices. In our work, we study the transport of spin waves in ferromagnetic(FM) and antiferromagnetic(AFM) insulator bilayers. We focus on uncompensated interfaces that can essentially change the ordering temperatures for both the FM and the AFM[1].

For our investigation, we use atomistic spin dynamic simulations, where magnetic interactions are described using an extended Heisenberg model and we use the stochastic Landau-Lifshitz-Gilbert equation as the equation of motion. It is seen that with both, thermal and monochromatic excitations, the spin wave decays exponentially having a propagation length of several nanometers. The transport of magnons is studied via the magnon accumulation which is defined as the difference in the magnon population leading to diffusion. Additionally, the dispersion relation of such magnons are also calculated for different temperatures. We study the dependence of the propagation of magnons in such heterostructures on damping, anisotropy and exchange coupling at the interface.

[1] V. Brehm, M. Evers, U. Ritzmann, and U. Nowak, PHYSICAL REVIEW B 105, 104408(2022)