MAGNETRON SPUTTERING
In diode sputtering, not all of the electrons escaping the target contribute to the
ionized plasma glow area. The wasted electrons fly around the chamber causing
radiation and other problems, for example, the heating of the target. A magnetron
sputtering source addresses the electron problem by placing magnets behind, and
sometimes, at the sides of the target. These magnets capture the escaping
electrons and confine them to the immediate vicinity of the target. The ion current
(density of ionized argon atoms hitting the target) is increased by an order of
magnitude over conventional diode sputtering systems, resulting in faster
deposition rates at lower pressure. The lower pressure in the chamber helps create
a cleaner film. Target temperature is lower with magnetron sputtering enhancing
the deposition of high quality films.