Patent ID: 7931977

Claim:
A high density magnetic information storage medium comprising magnetic islands composed of a magnetic film or magnetic alloy film and deposited over a substrate having a surface patterned either with a plurality of convex spherically shaped dots spaced apart from each other or with a plurality of concave spherically shaped holes spaced apart from each other, such that due to the spherical topography of the substrate surface a local variation in thickness or composition of the deposited film is formed along the substrate surface, wherein the magnetic film comprises layers each comprising one selected from platinum and palladium, and layers comprising cobalt, stacked in an alternating arrangement, wherein each layer of the magnetic film has a thickness of less than or equal to approximately 3 nanometers, wherein each magnetic island is magnetically decoupled from neighboring magnetic islands, and the easy axis of the magnetic islands is oriented in a fixed angle between 0° and 70° to the surface normal of the substrate.