Antiferromagnetic dynamics of Mn2Au driven by spin current pulses with perpendicular spin polarization

Abstract

Antiferromagnets hold promise for ultrafast coherent switching of magnetic order. This study uses atomistic-level dynamic simulations to investigate the ultrafast spin dynamics of Mn2Au under current pulses, incorporating the effects of polarized spin-current attenuation across Mn layers. Stable, coherent spin precession is achieved above a critical current density, with terahertz frequencies that scale linearly with current strength. Additionally, 90° or 180° Néel vector switching within 1 ps, influenced by current density and pulse duration, demonstrates the possibility of precise control of spin dynamics. These results offer atomic-level insight into ultrafast dynamics in antiferromagnetic spintronic structures.