Patent ID: 7525774

Claim:
A magneto-resistance effect type magnetic head, comprising: a magnetic sensing device including a spin valve film that detects a magnetic signal from a magnetic recording medium, while contacting the magnetic recording medium in a sliding motion, said spin valve film including: an antiferromagnetic layer, a fixed magnetization layer having magnetization fixed in a predetermined direction by an exchange coupling magnetic field acting between said antiferromagnetic layer and said fixed magnetization layer, a free magnetization layer having a magnetization direction which varies in response to an external magnetic field, and a nonmagnetic layer for magnetically isolating said fixed magnetization layer and said free magnetization layer from each other, said nonmagnetic layer being formed from a conductive layer, a first interface layer formed on an interface between said fixed magnetization layer and said conductive layer, and a second interface layer formed on an interface between said conductive layer and said free magnetization layer, said conductive layer having a lower resistivity than the first interface layer and the second interface layer; said conductive layer being made of at least one of Au, Pt, Ni, Pd, Cr, CuPd, CuPt, CuNi and CuCr, and said first and second interface layers being made of, at least one different material than the conductive layer, including CuAu, CuPd, CuPt, CuRu, CuNi and CuRh; and said fixed magnetization layer and said free magnetization layer said made of at least one of NiFe and CoNiFe.