Computational study of skyrmion stability and transport on W/CoFeB.

Skyrmions are topologically protected magnetic structures originating from Dzyaloshinbskii-Moriya Interaction (DMI) which can be driven by a spin-polarized current making it a candidate for many different novel spintronic devices. However, the transport velocity is proportional to the size of the skyrmion rendering the effort of miniaturizing spintronics devices useless indicating that it is not possible to realise high-speed transport, small size and low operating current at the same time. One approach to solving the trilemma is to increase the spin Hall angle [Formula: see text], the conversion ratio between charge current and spin current, in the heavy metal layer.