Seagate Technology Incorporated

Western Digital Technologies, Inc.

Raj Thangaraj

Michael Joseph Stirniman

Huan H Tang

Xiaoding Ma

Jing Gui

Erol Girt

Mariana Rodica Munteanu

Thomas P Nolan

Samuel Dacke Harkness, Iv

Zhong (Stella) Wu

Gary Clark Rauch

Qixu David Chen

Thomas Edward Karis

Charles Frederick Brucker

Kueir-Weei Chour

Samuel Dacke Harkness

Roger Ristau

Tom Nolan

Andrey Ovcharenko

Daniel Bilich

A nitrogenated diamond-like carbon (DLC) layer, like a nitrogenated DLC overcoat on a magnetic recording disk, includes cyanoacrylates that are attached to nitrogenated sites on the surface of the carbon layer. Cyanoacrylates are reactive with surface amine groups, which are among the nitrogenated surface sites that act as adsorption sites for volatile contaminants in the disk drive. The covalent bonding of the cyanoacrylate with the amine groups and other reactive sites on the disk overcoat blocks the adsorption of contaminants when they impinge on the overcoat surface. The cyanoacrylate may be applied to the overcoat by dipping the disk into a solution containing the cyanoacrylate or by exposing the overcoat to a cyanoacrylate vapor.

Passivated nitrogenated diamond-like carbon layer and method for passivating it

A perpendicular magnetic recording medium having a substrate, a Cr-doped Fe-alloy-containing underlayer containing about 8 to 18 at % Cr and a perpendicular recording magnetic layer, and a process for improving corrosion resistance of the recording medium and for manufacturing the recording medium are disclosed.

Perpendicular media with Cr-doped Fe-alloy containing soft underlayer (SUL)

Perpendicular media with Cr-doped Fe-alloy-containing soft underlayer (SUL)

Perpendicular media with Cr-doped Fe-alloy-containing soft underlayer (SUL) for improved corrosion performance

A granular perpendicular magnetic recording medium having a surface treated magnetic layer comprising an oxidized or nitrogenized boundary layer formed on the surface of the magnetic layer, wherein the magnetic layer comprises granular magnetic regions having oxygen and/or nitrogen-containing grain boundaries. In one embodiment, the granular perpendicular recording medium further comprises a soft magnetic layer below the surface treated granular magnetic layer and a protective overcoat over the surface treated granular magnetic layer. A method of manufacturing a granular perpendicular magnetic recording medium includes depositing a magnetic layer having granular structure over a substrate and subsequently surface treating the granular magnetic layer in an oxygen and/or nitrogen-containing atmosphere to produce an oxidized and/or nitrogenized boundary layer formed on the surface of the granular magnetic layer. The granular perpendicular magnetic recording medium of the present invention exhibits high Hc and SNR while exhibiting improved corrosion resistance and contact start-stop performance.

Granular perpendicular media with surface treatment for improved magnetic properties and corrosion resistance

A perpendicular recording medium having a magnetic layer comprising cobalt, platinum, and at least one of molybdenum and chromium. In a preferred embodiment, the perpendicular recording medium comprises granular magnetic regions having oxygen-containing grain boundaries. The magnetic layer of the present invention preferably exhibits improved corrosion resistance while maintaining the magnetic properties suitable for high density perpendicular recording.

Perpendicular media with improved corrosion performance

A magnetic recording medium with low bonded lubricant at the landing zone, where the head takes off and lands, for better wear resistance, and with high bonded lubricant at the data zone to protect the data from corrosion, and a method of making the same are disclosed.

Zone bonded lubrication for hard disk recording media

Corrosion protection of magnetic recording media is achieved by providing a thin protective barrier layer comprising ruthenium on the magnetic layer. Embodiments include forming a corrosion barrier layer less than 10 &angst; of elemental ruthenium, a ruthenium oxide, a ruthenium alloy, a layer comprising mixed oxides of ruthenium and an alloying element, a composite of a ruthenium layer and a layer of ruthenium oxide or a composite of a ruthenium alloy layer and a layer of mixed oxides of ruthenium and an alloying element. A carbon containing an overcoat is then formed, as at a thickness of about 10 &angst; to 50 &angst;, on the corrosion protective layer.

Magnetic recording media with Ru corrosion barrier layer

A component of a recording device comprising a magnetic layer, means for improving corrosion resistance of the magnetic layer and a carbon overcoat, and a method of making and using the same are disclosed. The means for improving corrosion resistance of the magnetic layer comprises a sealing layer comprising a refractory metal or a refractory metal-containing alloy.

Component of a magnetic recording medium with sealing layer for corrosion protection

A magnetic recording medium comprising a magnetic layer and means for resisting corrosion of the magnetic layer, and a method of making and using the magnetic recording medium are disclosed.

Lubricant overcoat for recording media and a process for making the same

Corrosion resistant magnetic thin film media are fabricated using a CoCr magnetic layer having a stabilized protective chromium oxide film thereon. Stabilization of the protective chromium oxide film is achieved by incorporating a stabilizing element, such as Mo, V, Mn, Nb, Ni or Si, in the magnetic layer, thereby enabling elimination of the protective overcoat, e.g., C-containing protective overcoat, or forming the protective overcoat at a significantly low thickness of less than about 20 &angst;, e.g., up to about 1 &angst;. Embodiments include forming a magnetic layer comprising Co and Cr on an underlayer, and then forming a thin magnetic layer containing Co and Cr with the chromium oxide stabilizing element thereon. Embodiments further include introducing the chromium oxide stabilizing element by diffusion or ion implantation into a sputter deposited Co&mdash;Cr magnetic alloy layer.

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Fremont, CA, United States of America

Raj Thangaraj