Perpendicular magnetic recording apparatus

Details Perpendicular magnetic recording apparatus Perpendicular magnetic recording apparatus

2006-09-12

2006-09-12

Wong, K. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

Reexamination Certificate

active

07106539

ABSTRACT:
A perpendicular magnetic recording apparatus includes a perpendicular double-layered media having a substrate, a soft underlayer including a soft magnetic layer, an intermediate layer, and another soft magnetic layer in which the two soft magnetic layers are antiferromagnetically coupled with each other, and a perpendicular recording layer, and a magnetic head including a main pole, a return yoke, and an exciting coil. A relationship between an antiferromagnetic coupling force Hex_afc of the two soft magnetic layers included in the soft underlayer and a full width at half maximum MWW in a cross track direction when a low-frequency signal is recorded on the perpendicular recording layer by the magnetic head satisfies the following formula:in-line-formulae description="In-line Formulae" end="lead"?Hex—afc>1.6*ln((0.23−MWW)2*100))+25.6.in-line-formulae description="In-line Formulae" end="tail"?

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Australian Search Report dated Apr. 28, 2006 for Singapore Appln. No. 200503937.5.

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