Large-area Ar+ projection has been used to generate planar magnetic nanostructures on a 1¿-format hard disk in a single step (see Figure). The recording pattern was transferred to a Co/Pt multilayer without resist processes or any other contact to the delicate media surface. It is conceivable that magnetic nanostructures can be replicated from a single stencil mask on large quantities of disks for future high-density recording.
Dietzel, A. H., Berger, R., Loeschner, H., Platzgummer, E., Stengl, G., Bruenger, W. H., & Letzkus, F. (2003). Nanopatterning of magnetic disks by single-step Ar+ Ion projection. Advanced Materials, 15(14), 1152-1155. https://doi.org/10.1002/adma.200304943