Defect-free patterning of sol-gel-coated substrates for magnetic recording media
View Patent ↗A method of manufacturing a magnetic recording medium comprises steps of providing a non-magnetic substrate for a magnetic recording medium, the substrate including at least one major surface; forming a layer of a sol-gel on the at least one major surface; forming a pattern, e.g., a servo pattern in an exposed surface of the layer of said sol-gel; and converting the layer of sol-gel to a glass or glass-like layer while preserving the pattern in an exposed surface of said glass or glass-like layer. Embodiments of the invention include magnetic media including a patterned glass or glass-like layer formed from a layer of a hydrophilic sol-gel with the pattern embossed therein by means of a stamper having a hydrophilic surface including a negative image of the pattern.
1. A stamper for embossing a servo pattern in a surface of a layer of a hydrophilic sol-gel formed on a surface of a substrate for a magnetic recording medium, comprising:
(a) a main body having an embossing surface including a negative image of said servo pattern, wherein said main body is formed of a first metal; and
(b) means for facilitating release of said embossing surface of said stamper from said surface of said layer of sol-gel subsequent to embossing of said servo pattern, wherein said embossing surface is a patterned surface layer of the stamper which directly contacts the surface of the sol-gel, and said embossing surface is formed of platinum, carbon, or a hydrophobic polymer.
2. The stamper as in claim 1 , wherein said hydrophobic polymer comprises an amorphous thermoplastic material.
3. The stamper as in claim 1 , wherein said first metal is nickel and said hydrophobic polymer is a sputtered hydrophobic polymer.
4. The stamper as in claim 1 , wherein said embossing surface is formed of platinum or carbon.
5. The stamper as in claim 1 , wherein said embossing surface is formed of a polycarbonate, a polyetherimide, a polypropylene, or a polyethylene.
6. The stamper as in claim 5 , wherein said embossing surface is formed of a polyetherimide.
7. A stamper for embossing a servo pattern in a surface of a layer of a hydrophilic sol-gel formed on a surface of a substrate for a magnetic recording medium, comprising:
a main body having an embossing surface including a negative image of said servo pattern, wherein said embossing surface is a patterned surface layer of the stamper which directly contacts the surface of the sol-gel, and said embossing surface is formed of platinum, carbon, a polycarbonate, a polyetherimide, a polypropylene, or a polyethylene.
8. The stamper as in claim 7 , wherein said main body is formed of a hydrophobic polymeric material.