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Systems And Methods For Making Radially Anisotropic Thin-Film Magnetic Torroidal Cores, And Radially Anisotropic Cores Having Radial Anisotropy, And Inductors Having Radially Anisotropic Cores

United States Patent Application

View the Complete Application at the US Patent & Trademark Office
A radially anisotropic toroidal magnetic core is fabricated by a method including providing apparatus having a first magnet for providing a radial magnetic field extending across a cavity from an axial spindle to a surrounding second magnetic element, placing a substrate in the cavity, the substrate having a hole fitting around the head of the spindle; and sputter-depositing a film of ferromagnetic material onto the substrate. An alternative fabrication uses a similar fixture to impose magnetic anisotropy by annealing a previously-formed toroidal core. A particular fixture adapted for deposition by electroplating or for applying anisotropy by annealing pre-formed cores applies magnetic fields symmetrically from above and below the cores. Also described are the radially anisotropic core produced by the method, and an inductor having a coil wound on the radially anisotropic core.
Qui, Jizheng (West Lebanon, NH), Sullivan, Charles R. (West Lebanon, NH)
The Trutees of Dart,outh College (Hanover NH)
14/ 346,659
September 24, 2012
U.S. GOVERNMENT RIGHTS [0002] The invention was made with Government support under Department of Energy Grant No. 505904. The Government may have certain rights in this invention.