Patent ID: 6873500

Claim:
An exchange coupling film, wherein: a seed layer, an antiferromagnetic layer, and a ferromagnetic layer are laminated in that order from a bottom, and a direction of magnetization of the ferromagnetic layer is set in a specified direction due to generation of an exchange coupling magnetic field at an interface between the antiferromagnetic layer and the ferromagnetic layer; a substrate layer formed from at least one element selected from the group consisting of Ta, Hf, Nb, Zr, Ti, Mo, and W is formed under the seed layer; the seed layer is formed containing Cr and an element X (wherein the element X is at least one selected from the group consisting of Fe, Ni, Go, Ti, V, Nb, Zr, Hf, Ta, Mo, W, and Y); and a compositional ratio of Cr is at least 80 at %, and a film thickness of the seed layer is at least 20 Å and at most 130 Å.