  Topological spin textures can serve as non-volatile information carriers.
Here we study the current-induced dynamics of an isolated magnetic skyrmion on
a nanoscale square-grid pinning pattern formed by orthogonal defect lines with
reduced magnetic anisotropy. The skyrmion on the square grid can be pixelated
with a quantized size of the grid. We demonstrate that the position, size, and
shape of skyrmion on the square grid are electrically configurable. The
skyrmion center is quantized to be on the grid and the skyrmion may show a
hopping motion instead of a continuous motion. We find that the skyrmion Hall
effect can be perfectly prohibited due to the pinning effect of the grid. The
pixelated skyrmion can be harnessed to build future programmable racetrack
memory, multistate memory, and logic computing device. Our results will be a
basis for digital information storage and computation based on pixelated
topological spin textures on artificial pinning patterns.
