Patent ID: 6914735

Claim:
A manufacturing method for a magnetic recording medium, comprising the steps of: making contact a master information carrier having a plurality of ferromagnetic thin films in the form of an information signal provided adjacent to each other at predetermined intervals in the circumferential direction with a magnetic recording medium onto which said information signal is magnetically transferred; and allowing a leakage flux between the adjacent ferromagnetic thin films in the circumferential direction caused by an applied magnetic field to said master information carrier to magnetize said magnetic recording medium in the direction of said applied magnetic field so as to form magnetization transition regions in the circumferential direction in said magnetic recording medium, wherein when the circumferential length of the ferromagnetic thin film on said master information carrier is A, the film thickness of said ferromagnetic thin film is t and A/t is an aspect ratio, the aspect ratio is set so that an effective transfer magnetic field corresponding to a magnetic material constructing said ferromagnetic thin film is not less than 1000 oersteds.