A rotatable cylindrical magnetron sputtering device that includes a cathode body defining a magnet receiving chamber and a cylindrical target assembly surrounding the cathode body, wherein the cylindrical target assembly is rotatable around the cathode body. The cylindrical target assembly includes a hollow mandrel and a target portion mounted around and spaced away from the hollow mandrel portion so as to create a space gap between the hollow mandrel and the target portion, wherein the space gap may be greater than 0.002 inch and less than 0.020 inch.