Patent ID: 6906898

Claim:
A reproducing sensor comprising: a multi-layer construction having: a first MR element comprising a first ferromagnetic layer (pin), a second ferromagnetic layer (free) and a non-magnetic insulting layer formed between the first ferromagnetic layer and the second ferromagnetic layer, a second MR element comprising a third ferromagnetic layer (free), a fourth ferromagnetic layer (pin) and non-magnetic insulting layer formed between the third ferromagnetic layer and the fourth ferromagnetic layer, and a non-magnetic conductive layer formed between the second ferromagnetic layer (free) and the third ferromagnetic layer (free), wherein a resistance of the first MR element and the second MR element is changed reversely from the magnetic field in the same direction, and magnetization directions of the first ferromagnetic layer and the fourth ferromagnetic layer are arranged antiparallel with each other; a pair of electrodes for flowing an electric current in the direction perpendicular to the film surface of the multi-layer construction; and a pair of shields inserting the multi-layer construction, wherein the first MR element and the second MR element are electrically connected in series through the non-magnetic conductive layer by passing current between the pair of electrodes, and are patterned together with almost the same width, and wherein magnetization directions of the second ferromagnetic layer and the third ferromagnetic layer are arranged in parallel with each other.