Spontaneous antiferromagnetic skyrmion/antiskyrmion lattice in the frustrated triangular lattice

F. A. GÓMEZ ALBARRACÍN; M. MOHYLNA; H. D. ROSALES; M. ZUKOVIC

Bordeaux

Workshop; Indo-French workshop "Novel Phases of Matter in Frustrated Magnets" in Bordeaux !; 2022

(Invited speaker) Antiferromagnetic skyrmions are topological quasiparticles of great interest for data storage applications due to their ultra-small sizes, no transverse deflection and efficient manipulation. Here we show that a spontaneous antiferromagnetic skyrmion/antiskyrmion lattice emerges in the classical Heisenberg antiferromagnet on the triangular-lattice under magnetic fields, taking only exchange interactions. By means of the Luttinger-Tisza approximation and large scale Monte-Carlo simulations (combining Parallel-Tempering and overrelaxation with the Metropolis algorithm), we present a rich magnetic phase diagram including exotic multiple-q phases, degenerate states and a spontaneousAF-SkL/ASkL lattice at intermediate magnetic fields. These findings greatly enrich the research on antiferromagnetic skyrmions in centrosymmetric materials or lattices including relatively weak Dzyaloshinskii-Moriya interaction.