Patent ID: 7588669

Claim:
A deposition system, comprising: a process chamber; a workpiece holder within the process chamber, configured to hold a workpiece; a first target comprising a first material, disposed within the process chamber; a second target comprising a second material, disposed within the process chamber; a third target comprising a third material, disposed within the process chamber, wherein the first target, the second target, and the third target respectively occupy different circular sectors of a circle, wherein the first target occupies a circular sector with an angular span equal to or smaller than 120 degrees; a single magnet assembly configured to scan in the vicinity of the first target and the second target and third target along a scanning direction, wherein the single magnet assembly has substantially a pie shape having an angular span smaller than 120 degrees, wherein the single magnet assembly is configured to scan across the first target to produce magnet flux substantially only over the first target to deposit the first material on the workpiece; and a transport mechanism operatively coupled to the magnet assembly, configured to move the magnet assembly from the first target to the second target in a rotational movement.