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We predict topological magnetic properties of B20 systems, that are organizedin atomically thin multilayers. In particular we focus on FeSi/CoSi andFeSi/FeGe superlattices with different number of layers and interfacestructure. We demonstrate that absence of long range magnetic order, previouslyobserved in bulk FeSi and CoSi, is broken near the FeSi/CoSi interface, where amagnetic state with non-trivial topology appears. Using electronic structurecalculations in combination with the magnetic force theorem, we calculate theHeisenberg and Dzyaloshinskii-Moriya (DM) interactions in these systems. Withthis information, we perform atomistic spin dynamics simulations at finitetemperature and applied magnetic field for large supercells with up to$2\cdot10^6$ spins to capture the complexity of non-collinear textures inducedby the DM interaction. The spin dynamics simulations predict the formation ofantiskyrmions in a [001]-oriented FeSi/CoSi multilayer, intermediate skyrmionsin a [111]-oriented FeSi/CoSi system and Bloch skyrmions in the FeSi/FeGe (001)system. The size of different types of skyrmions is found to vary between 7 nmand 37 nm. The varying topological magnetic texture in these systems can beattributed to the complex asymmetric structure of the DM micromagnetic matrix,which is different from previously known topological magnets. Furthermore,through structural engineering, we demonstrate that both FM and AFM skyrmionscan be stabilized, where the latter are especially appealing for applicationsdue to the zero skyrmion Hall effect. The proposed B20 multilayers showpotential for further exploration and call for experimental confirmation.

Tunable topological magnetism in superlattices of nonmagnetic B20 systems