Focused ion beam irradiation on ferromagnetic Co/Pt films permits controlled modification of the coercivity. This is demonstrated experimentally and mapped to micro-magnetic simulations. Temperature measurements prove the thermal stability of films and nanodots in an application relevant temperature range. For the first time, Extraordinary Hall-Effect measurements are performed at a single-domain ferromagnetic nanodot with a target size of 250 nm in a Hall current device. This verifies the thermal stability and the read-out ability of the magnetic bistable states. Thus, the ultra-low volume magnetic Co/Pt dots fulfill the demands for use in field-coupled logic devices.
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