Patent ID: 8703621

Claim:
A manufacturing method of a magnetic recording medium, comprising: forming a lift-off layer, a first hard mask, and a second hard mask formed of a material different from a material of the first hard mask and dissolvable in a same peeling liquid as a peeling liquid that dissolves the lift-off layer, on a magnetic recording medium containing a substrate and a magnetic recording layer provided on the substrate; forming a mask layer having a pattern regularly arranged in a longitudinal direction by etching each of the second hard mask, the first hard mask, and the lift-off layer; forming a recording portion and a non-recording portion by patterning the magnetic recording layer using the mask layer; and peeling the mask layer by subjecting the mask layer to the peeling liquid to dissolve the lift-off layer and the second hard mask simultaneously, wherein the material of the lift-off layer and the material of the second hard mask are selected from a group including magnesium, vanadium, manganese, iron, cobalt, nickel, zinc, germanium, arsenic, molybdenum, antimony, tungsten, rhenium, thallium, lead, alloys thereof, and compounds containing 50 at % or more of these elements, and wherein the peeling liquid has a pH value of 3 to 6 and is selected from solutions of a group consisting of hydrogen peroxide, nitric acid, sulfuric acid, phosphoric acid, boric acid, chromic acid, fluoric acid, hydrogen iodide, hydrogen bromide, formic acid, acetic acid, oxalic acid, and mixtures thereof.