Method of Using a Ferromagnet Material Having a High Permeability and Saturation Magnetization at Low Temperatures.
Patent Application, Filed 19 May 89,
DEPARTMENT OF THE ARMY WASHINGTON DC
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The general object of this invention is to take advantage of the high saturation magnetization of the ferromagnet material gadolinium to charge a superconductive ring even when the gadolinium has a lower transition temperature than the superconductive material. The aforementioned objects can be attained by a method including the steps of placing a bar of a ferromagnet material in an annular ring of superconductive material at a temperature above both the transition temperature of the ferromagnet material and the transition temperature of the superconductive material applying an axial magnetic field of sufficient strength to saturate the ferromagnet when the ferromagnet is cooled to below its transition temperature cooling the ferromagnet to below its transition temperature without cooling the superconductive material so that the superconductive material does not become superconductive material does not become superconducting before the saturation of the ferromagnet cooling the superconductive material to below its transition temperature removing the ferromagnet and the applied field and allowing the system to warm to a convenient operating temperature that must be below the transition temperature of the superconductive material. Patent applications. AW
- Electricity and Magnetism