Johannes Reim: Skyrmion-lattice-like spin structure in antiferromagnetic CaBaCo2Fe2O7

Abstract

Despite the strong geometric frustration, CaBaCo₂Fe₂O₇ displays a 3D long range magnetic order below T_N = 160 K, which can be described by a Heisenberg nearest-neighbor model. At low temperatures a splitting of the magnetic peaks, τ = 0.016 Å^-1, has been found using high-resolution neutron diffraction. The corresponding long-period order appears to be induced by DM interaction exploiting the freedom provided by frustration. The observed scattering can be modelled qualitatively with an antiferromagnetic Skyrmion lattice.