Before revision: Another way of writing such magnetic patterns is field-assisted magnet force microscopy patterning, where an external magnetic field a little below the switching field of the nano-islands is applied and a magnetized scanning probe is used to locally raise the field strength above that required to reverse the magnetization of selected islands
After revision: Another way of writing such magnetic.ic patterns is field-assisted magnet force microscopy patterning, where an external magnetic field a little below the switching field of the nano-islands is applied and a magnetized scanning probe is used to locally raise the field strength above that required to reverse the magnetization of selected islands