GIANT MAGNETORESISTIVE SENSOR HAVING SELF-CONSISTENT DEMAGNETIZATION FIELDS

摘要

The present invention is directed to a spin valve sensor (140) for use in a data storage system (100), that is adapted to receive a sense current (I) and produce a GMR effect in response to applied magnetic fields. The spin valve sensor (140) includes first and second ferromagnetic free layers, a spacer layer positioned between the first and second ferromagnetic free layers 8150 and 152), and a biasing component. The first ferromagnetic free layer (150) has a magnetization (M1) in a first direction, when in a quiescent (non-biased) state. The second ferromagnetic free lyer (152) has a magnetization (M2) in a second direction that is anti-parallel to the first direction, when in a quiescent (non biased) state.