Patent ID: 8475672

Claim:
A plasma processing device comprising: a vacuum vessel; a plasma generation mechanism for generating a plasma within the vacuum vessel; a substrate holder that is arranged within the vacuum vessel and is for holding a substrate to be processed; and a magnetic circuit for generating a magnetic field within the vacuum vessel, wherein the magnetic circuit includes: a first magnetic field generation means provided separately from the plasma generation mechanism and that includes a magnetic coil provided outside an upper wall of the vacuum vessel opposite the substrate holder and that is configured so as to generate, by the magnetic coil, a magnetic field line pointing from a center side of the upper wall toward a side wall side of the vacuum vessel or a magnetic field line pointing from the side wall side toward the upper wall side of the vacuum vessel; and a second magnetic field generation means that is provided outside a side wall of the vacuum vessel along a circumferential direction of the side wall, that is arranged such that all of one of the magnetic poles points to an inside of the vacuum vessel and all of the other of the magnetic poles points to the outside of the vacuum vessel, and that is one and only one ring-shaped permanent magnet, the plasma generation mechanism is provided between the magnetic coil provided outside the upper wall of the vacuum vessel and the second magnetic field generation means, and according to a strength of a current applied to the magnetic coil, an area where a magnetic field line of the second magnetic field generation means collides with the magnetic field line of the first magnetic field generation means is changed either to the side wall side or to the center side to control a range of the plasma.