Method for magnetic recording on laminated media with...

Dynamic magnetic information storage or retrieval – General recording or reproducing – Thermomagnetic recording or transducers

Reexamination Certificate

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C360S135000, C428S690000, C428S690000, C369S013380

Reexamination Certificate

active

06963461

ABSTRACT:
A magnetic recording disk drive has an inductive write head and a heater to record data in laminated media on the recording disk. The laminated media, with at least two ferromagnetic layers separated by a nonmagnetic spacer layer, improves SNR. Each of the ferromagnetic layers can be formed of a material having an intrinsic coercivity capable of being written by a conventional inductive write head, but because of the desired lamination to increase SNR, the ferromagnetic layer farthest from the write head is exposed to a magnetic field less than its intrinsic coercivity and thus can not be written. To write to the laminated media, heat is directed to the lower ferromagnetic layer to reduce its intrinsic coercivity below the magnetic field to which it is exposed.

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