Vacuum metal evaporating and coating

I have the method for evaporating of metal in high vacuum. Metal material for evaporating is a wire(like CO2 welding). The speed of wire is apr. 4cm/sec. The electric arc is created between a wire and a block (made of steel). They are connected to el. current. 50% of wire is evaporated into atoms or ions and the rest is spattering. Equipment is in vacuum. Metal atoms creat the metal coating on the objects in vacuum tank or condensate into metal powder. There is one problem to solve. I need to focus the metal atom beam by a magnet. I do not know the type of magnet suitable for this purpose. Is there someone interesting in this problem?