US 7,531,249 B2
Magnetic recording medium and method of producing the same
Katsuya Oikawa, Tokyo (Japan)
Assigned to Canon Kabushiki Kaisha, Tokyo (Japan)
Filed on Mar. 01, 2007, as Appl. No. 11/680,838.
Claims priority of application No. 2006-070000 (JP), filed on Mar. 14, 2006.
Prior Publication US 2007/0217072 A1, Sep. 20, 2007
Int. Cl. G11B 5/66 (2006.01)
U.S. Cl. 428—829  [428/830] 16 Claims
OG exemplary drawing
 
1. A magnetic recording medium having a magnetic recording film, said magnetic recording film comprising at least one magnetic region dispersed in a non-magnetic region matrix, each said magnetic region comprising at least a core surrounded by a shell, wherein the core comprises one of a hard magnetic material or a soft magnetic material and the shell comprises the other said of said hard magnetic material or said soft magnetic material, wherein a cross-section of the core and shell is parallel to a surface of the magnetic recording film and wherein a diameter of the core and shell is uniform in the thickness direction of the magnetic recording film.