Perpendicular magnetic recording medium with single domain exchange-coupled soft magnetic underlayer and device incorporating same
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United States of America Patent
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Dec 3, 2013
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app pub date -
Jan 10, 2011
filing date -
Mar 14, 2008
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Abstract
A perpendicular magnetic recording disk having a single domain exchange-coupled laminated soft magnetic underlayer (SUL) is disclosed. The SUL is a combination synthetic anti-parallel coupled SUL structure, which has the product (Mst) of saturation magnetization and film thickness of the middle ferromagnetic layer less than the sum of the Mst of the bottom and top ferromagnetic layers. Subjected to a post radial field reset process, this SUL provides single domain state. Moreover, both robustness of stray fields and low permeability are obtained while keeping excellent corrosion resistance and cost effective manufacturability.
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