Magnon dispersion in bilayers of two-dimensional ferromagnets

Journal article (2021)

Authors

Lara C. Ortmanns Chalmers University of Technology, Kavli institute of nanoscience Delft, Rheinisch-Westfälische Technische Hochschule, Student
G. E.W. Bauer QN/Bauer Group - AS , Tohoku University, Kavli institute of nanoscience Delft
Yaroslav Blanter QN/Blanter Group - AS , Kavli institute of nanoscience Delft
Research Group
QN/Bauer Group (AS) (TU Delft)
Copyright: © 2021 Lara C. Ortmanns, G.E. Bauer, Y.M. Blanter
DOI: https://doi.org/10.1103/PhysRevB.103.155430
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Published Date

2021

Language

English

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Faculty

Applied Sciences

Department

QN/Quantum Nanoscience

Research Group

QN/Bauer Group

Abstract

We determine magnon spectra of an atomic bilayer magnet with ferromagnetic intra- and both ferro- and antiferromagnetic interlayer coupling. Analytic expressions for the full magnon band of the latter case reveal that both exchange interactions govern the fundamental magnon gap. The inter- and intralayer magnetic ordering are not independent: a stronger ferromagnetic intralayer coupling effectively strengthens the antiferromagnetic interlayer coupling as we see from comparison of two bilayer systems. The trivial topology of these exchange-anisotropy spin models without spin-orbit interaction excludes a magnon thermal Hall effect.

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