Patent ID: 6969559

Claim:
A spherical magnetic field gradient source structure comprising: a plurality of nested concentric magnetic laminae are arranged in a layered magnetic sphere; said layered magnetic sphere having an outer surface, a pair of opposing poles, a radial dimension, t, and a center; each of said plurality of nested concentric 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 layered magnetic sphere being configured to cancel unpaired negative surface charges from said outer surface; said variable magnetic strength, M(r), varies linearly with a normal distance, r, from said center; said perpendicular magnetic orientation and said variable magnetic strength, M(r), generating a uniform volume magnetic charge density, Ï, for said layered magnetic sphere, a magnetic field, M, perpendicular to said layered magnetic sphere, a maximum spherical magnetization, M(t), and a magnetic gradient with a linear dependence of magnetic field; said uniform volume magnetic charge density, Ï, varying from a one of said plurality of nested concentric magnetic laminae to another one of said plurality of nested concentric magnetic laminae; said plurality of nested concentric magnetic laminae being magnetic shells; a tunnel within said structure provides a working space, said tunnel being positioned through said structure, intersects said center; andâ€” said perpendicular magnetic orientation being perpendicular to said radial dimension, t.