Patent ID: 8778150

Claim:
A magnetron sputtering cathode comprising: a target having: a first annular groove provided on a first surface of the target; a first annular projection provided at a position facing the first annular groove on a second surface of the target on the opposite side of the first surface and having an inside side wall facing to the inside of the target and an outside side wall facing to the outside of the target; a second annular groove provided at least on one of sides outside and inside the first annular projection on the second surface; and a second annular projection provided at least on one of sides outside and inside the second annular groove on the second surface and having an inside side wall facing to the inside of the target and an outside side wall facing to the outside of the target; a first magnet located inside the first annular groove of the target on the side of the second surface of the target; and a second magnet having a polarity different from that of the first magnet and located outside the first annular groove of the target on the side of the second surface of the target, wherein the inside side wall and the outside side wall of the first annular projection, and the inside side wall and the outside side wall of the second annular projection are located between the first magnet and the second magnet, and a top surface at the first annular projection is directly opposite through the target to a bottom surface at the first annular groove.