Patent ID: 8373256

Claim:
A semiconductor device, comprising: a substrate; a semiconductor element, formed over a principal surface of said substrate and including an interconnect layer; and a magnetic shield covering said semiconductor element, wherein said magnetic shield includes a first structural member and a second structural member covering said first structural member, and wherein each of said first and said second structural members includes: a magnetic shielding film composed of a magnetic substance and covering said semiconductor element; and a buffer film disposed between said semiconductor element and said magnetic shielding film and preventing a diffusion of said magnetic substance, wherein said buffer film contains one, two or more chemical element(s) selected from a group consisting of tungsten (W), titanium (Ti) and ruthenium (Ru), wherein said magnetic shielding film is composed of said magnetic substance having spinel crystal structure and has (311) face oriented along a film-thickness direction, wherein said first structural member is composed of said buffer film and said magnetic shielding film, wherein said second structural member covers over said first structural member, wherein said magnetic substance in said second structural member has a (311) face oriented along a film-thickness direction, and wherein in both said first structural member and said second structural member, a degree of crystallinity of a surface facing said buffer film of said magnetic shield is greater than a degree of crystallinity of other parts of said magnetic shield.