Patent ID: 6731440
Filing Date: 2004-05-04
Classification: G11B

Abstract:
A method for magnetic transfer by bringing a master carrier for magnetic transfer and a slave medium closely together, said master carrier having a magnetic layer on surface of a substrate corresponding to an information signal, and said slave medium comprising a magnetic recording medium where the information is to be transferred, said method comprising the steps of:arranging ring type head electromagnets at least on one of upper and lower surfaces of the slave medium; rotating the slave medium or the ring type head electromagnet in track direction; performing initial DC magnetization on the slave medium in advance in track direction by applying magnetic field in track direction on the surface of the slave medium, and bringing the master carrier for magnetic transfer closely together with the slave medium processed by said initial DC magnetization; and performing magnetic transfer by applying magnetic field for transfer in track direction reverse to the direction of the initial DC magnetization on the surface of the slave medium, wherein, when the ring head type electromagnets are arranged at least one of upper or lower surfaces of the slave medium, magnetic field intensity distribution in track direction of the magnetic field generated is such that magnetic field intensity higher than the coercive force Hcs of the slave medium is present only in one direction at a position in track direction, and magnetic field intensity in reverse direction is lower than the coercive force Hcs of the slave medium at any position in track direction.