Relativistic Neel-order fields induced by electrical current in antiferromagnets

Understand

We predict that a lateral electrical current in antiferromagnets can induce non-equilibrium N\'eel order fields, i.e.

• fields whose sign alternates between the spin sublattices, which can trigger ultra-fast spin-axis reorientation.
• Based on microscopic transport theory calculations we identify staggered current-induced fields analogous to the intra-band and to the intrinsic inter-band spin-orbit fields previously reported in ferromagnets with a broken inversion-symmetry crystal.
• To illustrate their rich physics and utility, we considered bulk Mn2Au with the two spin sublattices forming inversion partners, and a 2D square-lattice antiferromagnet with broken structural inversion symmetry modelled by a Rashba spin-orbit coupling.