Dzyaloshinskii-Moriya interaction in antiferromagnetic systems
Dr. Alireza Qaiumzadeh (Norges teknisk-naturvitenskaplige universitet (NTNU), Institutt for fysikk, Trondheim, Norway)

The Dzyaloshinskii-Moriya interaction (DMI) is an antisymmetric exchange interaction between localized spins in magnetic materials, induced by relativistic spin-orbit coupling.
In this talk, I firstly present a theory for the calculation of DMI and show how a large non-homogeneous DMI, a Lifshitz-type invariant term, might be induced at the interface of antiferromagnetic/heavy-metal bilayers [1]. Then, I will demonstrate the possibility of all-magnonic helicity-dependent domain-wall motion in the presence of this chiral interaction [2].

[1] A. Qaiumzadeh, I. Ado, M. Titov, R. A. Duine, and A. Brataas, to be submitted (2017).
[2] A. Qaiumzadeh, L. A. Kristiansen, and A. Brataas, arXiv:1705.01572.