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MA: Fachverband Magnetismus

MA 11: Spin Transport and Orbitronics, Spin-Hall Effects I (joint session MA/TT)

MA 11.9: Vortrag

Dienstag, 18. März 2025, 11:45–12:00, H18

Simulations of spin transport in YIG — •Ben Schwanewedel, Moumita Kundu, and Ulrich Konstanz — Fachbereich Physik, Universität Konstanz, Konstanz, Germany

Being synthesized first in 1957, YIG has the lowest Gilbert damping among all known materials. This makes it interesting for spintronic applications and long-range spin transport. In YIG's complex unit cell Fe atoms occupy 20 sublattices leading to 20 magnon bands between 0 and 25 THz. We develop an atomistic spin model for YIG based on exchange interactions from Ref. [1], which were determined through neutron scattering. Further parameters were adapted from Ref. [2]. We varify our study through investigation of the magnon dispersion and comparing it to the results of Ref. [1].

We use atomistic spin dynamics simulations for the model above based on the stochastic Landau-Lifshitz-Gilbert equation to unravel its spin dynamics and spin transport properties. The spin transport is triggered by thermal gradients and and local magnetic fields and it is analyzed using an observable which is proportional to the magnon population. Also, magnon dispersions far from equilibrium are evaluated and discussed.

[1] Princep, Andrew J., et al. "The full magnon spectrum of yttrium iron garnet." npj Quantum Materials 2.1 (2017): 63.

[2] Barker, Joseph, and Gerrit EW Bauer. "Thermal spin dynamics of yttrium iron garnet." Physical review letters 117.21 (2016): 217201.

Keywords: YIG; Spin transport; Computational physics