An example of a spintronic based non-volatile memory device is the racetrack memory, in which information is encoded in magnetic domains separated by domain walls moving along a nanowire. A limitation of a standard racetrack is that it is basically a one-dimensional device and motion occurs along one direction only. The average access time to obtain the desired information scales linearly with the amount of information characterized by the number of bits or equivalently length of the wire, which is a disadvantage.
Recently, it has been proposed to put skyrmions on the track. The topological whirls are magnetic configurations with a particle-like character and can in principle move in two independent directions. Inspired by the Manhattan street network, we look into ways of exploiting the skyrmion nature for two-dimensional devices and analyze their stability and performance. A major advantage of such a two-dimensional network is the strongly decreased access time, scaling only with the square root of the information amount.