This paper predicts a novel method for antiferromagnetic domain switching using laser optical torques (LOTs). Atomistic spin dynamics simulations demonstrate picosecond 90 and 180-degree precessional toggle switching of the Néel vector in Mn₂Au with laser fluences on the order of mJ/cm². The LOTs' symmetry minimizes overshooting, and deterministic, non-toggle switching is also demonstrated. Even with ultrafast laser heating, a large parameter range allows for high switching probabilities. This method could be used independently or in conjunction with other techniques for all-optical control of antiferromagnets.

Jackson L. Ross, Paul-Iulian Gavriloaea, Frank Freimuth, Theodoros Adamantopoulos, Yuriy Mokrousov, Richard F. L. Evans, Roy Chantrell, Rubén M. Otxoa, Oksana Chubykalo-Fesenko