Dynamic magnetic information storage or retrieval – Record copying – Contact transfer
Reexamination Certificate
2005-03-08
2005-03-08
Faber, Alan T. (Department: 2651)
Dynamic magnetic information storage or retrieval
Record copying
Contact transfer
C360S131000
Reexamination Certificate
active
06865039
ABSTRACT:
A master medium for magnetic transfer includes a substrate having a concave portion formed in its surface corresponding to a pattern of recorded information to be transferred; a first perpendicular ferromagnetic layer deposited in the concave portion; and a second perpendicular ferromagnetic layer layered on the substrate surface and the first perpendicular ferromagnetic layer surface. The substrate surface and the first perpendicular ferromagnetic layer surface are flattened to form a single flat surface. In the master medium for magnetic transfer, a magnetic field change in a direction parallel to the substrate surface at a magnetization boundary of the first perpendicular ferromagnetic layer is steep. Since the influence of the change of an external magnetic field is reduced, it is possible to perform accurate transfer from the master medium for magnetic transfer to a slave medium for magnetic recording.
REFERENCES:
patent: 4422106 (1983-12-01), Sawazaki
patent: 5703733 (1997-12-01), Suzuki et al.
patent: 5851643 (1998-12-01), Honda et al.
patent: 2001-23163 (2001-01-01), None
Hamaguchi Shingo
Kuroda Sumio
Matsumoto Koji
Ozaki Kazuyuki
Tamanoi Ken
Faber Alan T.
Greer Burns & Crain Ltd.
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