Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2004-09-01
2008-03-25
Rickman, Holly (Department: 1773)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
Reexamination Certificate
active
07348077
ABSTRACT:
A magnetic recording medium based on the perpendicular magnetic recording system includes a substrate; a back layer which is formed on the substrate and which is formed of a soft magnetic material; an in-plane magnetized layer which is formed on the back layer and which has in-plane magnetization; and a recording layer which is formed on the in-plane magnetized layer and which has perpendicular magnetization, wherein the in-plane magnetized layer has a coercivity in an in-plane direction larger than a magnetic field generated by residual magnetization in a perpendicular direction of the recording layer. The influence on the reproduction output, caused by the mirror image effect of the soft magnetic back layer is reduced in wide range recording densities, thereby improving the resolution by decreasing the difference between the reproduction outputs of the magnetic recording medium at the low recording density and at the high recording density.
REFERENCES:
patent: 7144640 (2006-12-01), Hee et al.
patent: 2004/0184176 (2004-09-01), Shimazaki et al.
patent: A-2002-074638 (2002-03-01), None
patent: A 2003-45014 (2003-02-01), None
Machine translation of Takeuchi et al., JP 2002-216333, Aug. 2008.
Fujita Enji
Koda Tetsunori
Matsunuma Satoshi
Onuma Tsuyoshi
Shimazaki Katsusuke
Hitachi Maxwell Ltd
Rickman Holly
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