Patent ID: 6497802
Filing Date: 2002-12-24
Classification: H01J

Abstract:
A magnetron assembly positionable at a backside of a sputtering target and rotatable about a center position of said target, comprising:a plurality of first permanent magnets of a first magnetic polarity; a first pole of said first magnetic polarity formed on a side of said first permanent magnets facing said backside and comprising a closed band having a central aperture extending a first distance from said center of said target toward a circumferential periphery of said target and producing a first total magnetic flux; at least one second permanent magnet of a second magnetic polarity; and a second pole of said second magnetic polarity formed on a side of said at least one second permanent magnet facing said backside, disposed in said aperture, and separated from said first pole by a gap extending along a surface of said target and producing a second total magnetic flux; wherein a ratio of said first magnetic flux to said second magnetic flux is at least 1.5.