Magnon dispersion in bilayers of two-dimensional ferromagnets
Artikel i vetenskaplig tidskrift, 2021

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.


Lara Celine Ortmanns

Kavli Institute of Nanoscience Delft

Chalmers, Mikroteknologi och nanovetenskap, Tillämpad kvantfysik

RWTH Aachen University

Gerrit E.W. Bauer

Kavli Institute of Nanoscience Delft

Tohoku University

Yaroslav M. Blanter

Kavli Institute of Nanoscience Delft

Physical Review B

24699950 (ISSN) 24699969 (eISSN)

Vol. 103 15 155430


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