Magnetic copyring method for high density magnetic record medium
A copying method, a magnetic recording technology, applied to magnetic recording, alignment of tracks on a magnetic disk, configuration/installation of recording heads, etc., can solve problems such as copying of AFC media that does not obtain copying accuracy and does not take into account the recording and playback layer , to achieve the effect of suppressing magnetization disorder, reducing noise and reducing influence
Inactive Publication Date: 2003-01-22
FUJIFILM CORP
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[0008] However, the known magnetic replication methods so far are all based on the premise of replicating the recording and reproducing layer formed by an existing magnetic layer, without considering the Replication of AFC media with a recording and reading layer formed of two magnetic layers
It can be seen from the difference in layer structure between the recording and reproducing layer of the existing magnetic recording medium and the recording and reproducing layer of the AFC medium that even if the existing magnetic reproducing method is applied to the AFC medium as it is, good reproduction accuracy will not be obtained. , thus requiring a replication method adapted to the nature of the AFC media
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[0023] Hereinafter, embodiments of the magnetic copy method of the present invention will be described in detail with reference to the drawings. First, a description will be given of a master carrier for magnetic duplication used for magnetic duplication and a magnetic recording medium that is a slave medium on which predetermined information is magnetically copied from the master carrier for magnetic duplication.
[0024] figure 1 It is a cross-sectional view of the main parts of the magnetic recording medium 1 and the main carrier 10. The magnetic recording medium 1 is a high-density magnetic disk, which is a so-called AFC medium. The support 2 has at least a recording and reproducing layer 6 formed of a first magnetic layer 3, a non-magnetic bonding layer 4, and a second magnetic layer 5. . Although the figure shows a case where the recording and reading layer 6 is provided on only one side of the support 2, the recording and reading layer may be formed on both sides. The fir...
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A method of performing an accurate magnetic transfer to a high-density slave medium having two magnetic layers and utilizing antiferromagnetic coupling. The magnetic layer, which has been initially magnetized in advance, of a magnetic recording medium is conjoined with the data bearing surface of a master medium. A transfer magnetic field is applied to the conjoined body in the circumferential direction of the track of the first magnetic layer in the direction opposite the initial magnetization direction of the second magnetic layer. At this time, the thickness of the magnetic layer of the master medium, the permeability (material) of the magnetic layer, the form of the patterned magnetic layer, the separation distance between the master medium and the magnetic recording medium, etc., may be controlled so that the magnetic field of the transfer magnetic field does not effect the magnetization state of the first magnetic layer.
Description
Technical field [0001] The invention relates to a magnetic copying method for magnetically copying predetermined information such as servo information on a magnetic recording medium, in particular to a magnetic copying method for a high-density magnetic recording medium. Background technique [0002] In magnetic recording media, in general, as the amount of information increases, so-called high-speed access media that can record a large amount of information are required to be large in capacity, inexpensive, and capable of reading the required portion in a short time. At present, a new medium (sometimes) that has two magnetic layers and a non-magnetic bonding layer formed of ruthenium sandwiched between them is developed using the antiferromagnetically-coupled (AFC: antiferromagnetically-coupled) of the two magnetic layers. Known as SF media: syntheticFerrimagnetic Media), it is continuously achieving a leap in recording density. This type of AFC media has a non-magnetic bonding ...
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IPC IPC(8): G11B5/84G11B5/58G11B5/596G11B5/74G11B5/82G11B5/86
CPCG11B5/58G11B5/74G11B5/82G11B5/865G11B5/596G11B5/84
Inventor 西川正一安永正
Owner FUJIFILM CORP