Patent ID: 6921499
Filing Date: 2005-07-26
Classification: B82Y,G11B,H01J,Y10S,Y10T

Abstract:
1. A method of manufacturing a master carrier for magnetic transfer comprising a substrate having an unevenness pattern which corresponds to a transfer information for high density recording, and which master carrier comprises a soft magnetic layer with a track width of 0.3 μm or less, said method comprising: writing said master carrier for magnetic transfer by illuminating a disc coated with an electron beam resist while rotating the disc and scanning at least twice with an electron beam which has been modulated in accordance with a transfer information and has a writing diameter smaller than the width of a track on a same track over plural times, whereby said electron beam scans partially overlap within a given track to write and form a pattern; producing said substrate having an unevenness pattern by mastering based on the writing; and coating a layer of soft magnetic substance on said substrate, wherein a coefficient k, which satisfies a formula of W=[n−(n−1)k]xd is set to be not less than 0 and not more than 0.8, provided that k is a degree of overlap of the electron beam in writing a given track, W is the width of a given track in μm, n is the number of times that a given track is scanned by the electron beam, and d is the diameter of the electron beam in μtm.