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Realising the promise of next-generation magnetic nanotechnologies iscontingent on the development of novel methods for controlling magnetic statesat the nanoscale. There is currently demand for simple and flexible techniquesto access exotic magnetisation states without convoluted fabrication andapplication processes. 360 degree domain walls (metastable twists inmagnetisation separating two domains with parallel magnetisation) are one suchstate, which is currently of great interest in data storage and magnonics.Here, we demonstrate a straightforward and powerful process whereby a movingmagnetic charge, provided experimentally by a magnetic force microscope tip,can write and manipulate magnetic charge states in ferromagnetic nanowires. Themethod is applicable to a wide range of nanowire architectures withconsiderable benefits over existing techniques. We confirm the method'sefficacy via the injection and spatial manipulation of 360 degree domain wallsin Py and Co nanowires. Experimental results are supported by micromagneticsimulations of the tip-nanowire interaction.

A novel method for the injection and manipulation of magnetic charge states in nanostructures