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Fuji Electric Assigned Patent

Magnetic recording medium having soft magnetic underlayer with tailored relative permeability regions

Fuji Electric Co., Ltd., Kawasaki-shi, Japan, has been assigned a patent (8,980,447) developed by Uchida, Shinji, Matsumoto, Japan, for a “magnetic recording medium having a soft magnetic underlayer with tailored relative permeability regions.

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A magnetic recording medium is disclosed. The magnetic recording medium includes at least a disc-shaped non-magnetic substrate having a hole at a center, a soft magnetic underlying layer, and a magnetic recording layer. Relative permeability of the soft magnetic underlying layer under a magnetic field having one of the frequencies 100 MHz to 700 MHz increases gradually from a disc outer circumference to a disc inner circumference and a characteristic frequency of the relative permeability increases gradually from the disc inner circumference to the disc outer circumference.

The patent application was filed on June 7, 2013 (14/365,345).

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