Weak ferrimagnets with competing Dzyaloshinskii-Moriya coupling are perspective for the exchange-bias effect materials

Here I would like to draw attention to so-called weak ferrimagnets (WFIMs), or mixed compounds with competing Dzyaloshinskii-Moriya (DM) coupling, strictly speaking with different signs of the Dzyaloshinskii vector. Due to theoretical predictions ferrites-chromites RFe1−xCrxO3 (R is rare-earth or Y), Fe1−xCrxBO3, and Fe2−xCrxO3, as well as carbonates Mn1−xNixCO3 with competition of d3-d3, d3-d5, d5-d5, d5-d8, and d8-d8 DM couplings do reveal nontrivial concentration and temperature dependencies of magnetization, in particular, the compensation point(s). The weak ferrimagnets are believed to be perspective compounds for the exchange-bias effect materials.