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Magnetic skyrmions are promising candidates as elementary nanoscale bits inlogic-in-memory devices, intrinsically merging high density memory andcomputing capabilities. Here we exploit the dynamics of skyrmions interactingwith anisotropy energy barriers patterned by ion irradiation to designprogrammable logic gates. Using micromagnetic simulations with experimentalparameters, we show that a fine tuning of the barrier height and width allowsthe selective tunneling of skyrmions between parallel nanotracks triggered byskyrmion-skyrmion interaction. This can be leveraged to design skyrmionDe-multiplexer (DMux) logic gate which works solely using skyrmions as logicinputs. By cascading and connecting demultiplexer gates with a specifictopology, we develop a fully programmable logic gate capable of producing anypossible logic output as a sum of all minterms generated by a given set ofinputs without requiring any complex additional electric/magneticinterconversion. The proposed design is fully conservative and cascadable andpaves a new pathway for full skyrmionic-based logic-in-memory devices.

Programmable skyrmion logic gates based on skyrmion tunneling