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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

20140240074
A1
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.