| 摘要 |
PROBLEM TO BE SOLVED: To enhance the sensitivity of a reproducing head for enhancing recording density of a spin valve type GMR head. SOLUTION: In the GMR head constituted of a spin valve type reproducing head having a fixed layer 20 formed by laminating an anti-ferromagnetic body 21 and a ferromagnetic body 22, a separation layer 30 on the fixed layer and a free layer 40 consisting of a ferromagnetic body on the separation layer and an electromagnetic induction type recording head, a body-centered cubic crystal NiFeCr layer 10 is formed on a substrate 80 and the fixed layer 20 is formed on the body-centered cubic crystal NiFeCr layer. If the composition of the body-centered cubic crystal NiFeCr layer 10 as a base layer is expressed by (Ni1-xFex)1-yCry, 0<x<1, and 0.32<y<0.38 are satisfied in the GMR head. The MR ratio can be increased by 30-40% by using a body-centered cubic crystal NiFeCr film as a base to constitute a spin valve.
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