Micromagnetic simulation of a flux guide for a read head with sub-100 nm resolution

Large scale 3D micromagnetic simulations are performed on single pole read heads with pole tip cross sections of 45×45 and 100×200 nm. It is shown that tips with these dimensions have a much higher output than predicted by an analytical theory using the reciprocity theorem. The larger of these tips still behaves in a relatively soft manner and has an output waveform shape very close to the one predicted by the analytical model. The response of the small tip however is hysteretic.