McDermott Will & Emery LLP
Perpendicular magnetic recording media with improved interlayer
A low noise, high areal recording density, perpendicular magnetic recording medium comprises:(a) a non-magnetic substrate having a surface; and(b) a layer stack formed over the substrate surface, the layer stack comprising, in overlying sequence from the substrate surface:(i) a magnetically soft underlayer;(ii) at least one non-magnetic interlayer; and(iii) a CoCr-based, magnetically hard perpendicular recording layer;wherein the compositions of the at least one non-magnetic interlayer and the CoCr-based, magnetically hard perpendicular recording layer are selected to provide the medium with a negative nucleation field Hn, remanent squareness of about 1, and high coercivity of at least about 5,000 Oe.A method for manufacturing the medium by means of DC magnetron sputtering of layers (i)-(iii) is also disclosed.
Seagate Technology LLC
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additional inventional
Chung-Hee Rajiv Yadav
Chang Ranjan