The present disclosure provides an apparatus configured for sputter deposition on a substrate. The apparatus includes a cylindrical sputter cathode rotatable around a rotational axis, and a magnet assembly configured to provide a first plasma racetrack and a second plasma racetrack on opposite sides of the cylindrical sputter cathode, wherein the magnet assembly includes two, three or four magnets each having two poles and one or more sub-magnets, wherein the two, three or four magnets are configured for generating both the first plasma racetrack and the second plasma racetrack.