Another source of the field might be from remnant magnetization of iron - bearing rocks which were magnetized when the planet had a strong magnetic field during its younger years. (solarviews.com)
In a 2008 paper in Science, Parkin and colleagues demonstrated the beginnings of a racetrack memory based not on skyrmions, but on magnetic features called domain walls, which separate regions with different directions of magnetization in a material. (sciencenews.org)
Future work will explore the printing of anisotropic, or directional, bonded magnets, which are stronger than isotropic magnets that have no preferred magnetization direction. (sciencedaily.com)