Magnetic recording medium and method for producing the same
View Patent ↗A patterned magnetic recording medium, accessible by a magnetic recording head, including a plurality of tracks, a width direction of each track and that of the magnetic recording head being of a skew angle. The patterned magnetic recording medium includes a plurality of magnetic dots, each corresponding to a recording bit, formed on a non-magnetic material. The plurality of magnetic dots are arranged in a plurality of arrays, each array corresponding to one of the tracks. Every N adjacent magnetic dots of the array define a polygon, one side thereof being parallel to the corresponding track, and another side thereof being parallel to a direction corresponding to the skew angle of the corresponding track.
1. A method of producing a patterned magnetic recording medium including a plurality of magnetic dots, each corresponding to a recording bit, formed on a non-magnetic material, the method comprising:
forming an aluminum layer on a substrate made of the non-magnetic material;
forming a plurality of polygonal cavity portions in the aluminum layer, wherein each of the plurality of polygonal cavity portions extends across a width of more than one said recording bit in a track direction of the recording medium;
forming a plurality of nano-holes in the aluminum layer by anodic oxidation, the plurality of nano-holes being formed only in corners of the plurality of polygonal cavity portions; and
depositing a magnetic material in each of the nano-holes.
2. The method of claim 1 , wherein each of the plurality of polygonal cavity portions is of a shape of a parallelogram.
3. The method of claim 1 , wherein one side of each polygonal cavity portion is parallel to a recording track, and another side of each polygonal cavity portion is parallel to an angle different from a direction corresponding to a skew angle of the recoding track to accommodate a plurality of magnetic dots each corresponding to a recording bit.
4. The method of claim 1 , wherein the aluminum layer is formed directly on the substrate made of the non-magnetic material.