Patent ID: 6373364
Filing Date: 2002-04-16
Classification: H01F

Abstract:
A thin-film processing electromagnet for producing a uniaxial magnetic field along a surface of a substrate comprising:a magnetically permeable plate-shaped core having a center, a front side, a back side, a non-rectangular periphery bounding the front and back sides, and first and second orthogonal axes extending parallel to the front side of the plate-shaped core and intersecting at the center of the plate-shaped core; an electromagnetic coil having a plurality of windings that are wrapped around the first orthogonal axis and extend across the front side of the plate-shaped core; and said windings being arranged in a pattern across the front side of the plate-shaped core such that windings close to the center of the plate-shaped core extend substantially parallel to the second orthogonal axis and windings spaced from the center of the plate-shaped core along the first orthogonal axis are bowed with respect to the second orthogonal axis for reducing skew of the uniaxial magnetic field along the surface of the substrate.