Dynamic magnetic information storage or retrieval – General recording or reproducing – Thermomagnetic recording or transducers
Reexamination Certificate
2008-10-02
2010-10-12
Mercedes, Dismery E (Department: 2627)
Dynamic magnetic information storage or retrieval
General recording or reproducing
Thermomagnetic recording or transducers
C360S062000, C360S135000, C428S817000, C428S829000, C428S836100
Reexamination Certificate
active
07813071
ABSTRACT:
A thermally assisted magnetic recording system is provided to achieve excellent thermal resistance and low noise. In one embodiment, a magnetic recording medium is used, in which the magnetic intergrain exchange coupling is large to let the magnetization be thermally stable by coupling the magnetic grains constituting the recording layer at room temperature (the temperature maintaining the magnetization) and reduced by heating during recording to let the recording magnetization transition slope become steep. Parameter A normalizing the slope around the coercivity of the MH-loop of the medium is 1.5≦A<6.0 at room temperature, and it becomes approximately 1.0 with heating.
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Akagi Fumiko
Igarashi Masukazu
Saga Hideki
Hitachi Global Storage Technologies - Netherlands B.V.
Mercedes Dismery E
Patterson & Sheridan LLP
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