Patent ID: 6995642
Filing Date: 2006-02-07
Classification: H01F,Y10T

Abstract:
1. A planar spherical magnetic field gradient source structure comprising: a plurality of planar magnetic laminae are stacked in a layered magnetic sphere; said planar layered magnetic sphere having an outer surface, a pair of opposing poles, a radial dimension, t, and a center; each of said plurality of planar magnetic laminae being thinner than a spherical radius and having a magnetic charge distribution, a perpendicular magnetic orientation and a variable magnetic strength, M(r); said planar layered magnetic sphere being configured to cancel unpaired negative surface charges generated by said outer surface; said variable magnetic strength, M(r), varies linearly with a normal distance, r, from said center; a working space within said structure; said perpendicular magnetic orientation and said variable magnetic strength, M(r), generating a uniform volume magnetic charge density, ρ, for said planar layered magnetic sphere, a magnetic field, M, perpendicular to said planar layered magnetic sphere, a maximum spherical magnetization, M(t), and a magnetic gradient with a linear dependence of magnetic field; and said uniform volume magnetic charge density, ρ, varying abruptly from a one of said plurality of planar magnetic laminae to another one of said plurality of plurality of planar magnetic laminae.