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WD Media Assigned Four Patents

Thermally stabilized perpendicular magnetic recording medium, controlling damping of magnetic media for heat assisted magnetic recording, measuring media performance associated with adjacent track interference

Thermally stabilized perpendicular magnetic recording medium
WD Media, LLC, San Jose, CA, has been assigned a patent (9,042,053) developed by Yang, Yang, and Okamoto, Iwao, Singapore, Singapore, for a “thermally stabilized perpendicular magnetic recording medium.”

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A magnetic recording medium including a substrate, and at least one magnetic layer formed on the substrate. The magnetic layer is formed from an alloy containing Cobalt, and Platinum, (Pt). The magnetic layer is also formed from grain boundary segregation materials comprising Manganese Oxide and at least one of Silicon Oxide, Chromium Oxide, and Cobalt Oxide, (CoO).

The patent application was filed on June 24, 2014 (14/313,910).

Controlling damping of magnetic media for heat assisted magnetic recording
WD Media, LLC, San Jose, CA, has been assigned a patent (9,034,492) developed by Mallary, Michael L., Sterling, MA, Bertero, Gerardo A., Redwood City, CA, and Srinivasan, Kumar, San Mateo, CA, for a “systems and methods for controlling damping of magnetic media for heat assisted magnetic recording.”

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”Systems and methods for controlling the damping of magnetic media for heat assisted magnetic recording are provided. One such system includes a heat sink layer, a growth layer on the heat sink layer, a magnetic recording layer on the growth layer, where the growth layer is configured to facilitate a growth of a preselected crystalline structure of the magnetic recording layer, and a capping magnetic recording layer on the magnetic recording layer, the capping recording layer including a first material configured to increase a damping constant of the capping recording layer to a first preselected level.

The patent application was filed on January 11, 2013 (13/740,115).

Recording media with multiple exchange coupled magnetic layers
WD Media, LLC, San Jose, CA, has been assigned a patent (9,028,985) developed by Desai, Mrugesh, San Jose, CA, Kang, Kyongha, Fremont, CA, Zhou, Jian, Dublin, CA, and Acharya, B. Ramamurthy, Fremont, CA, for a “recording media with multiple exchange coupled magnetic layers.”

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”A magnetic recording, (PMR) disk structure is described. The PMR disk structure may include a magnetic capping layer being substantially free of an oxide, an upper magnetic layer with an oxide content disposed directly below and in contact with the magnetic capping layer, and an upper exchange coupling layer disposed below the upper magnetic layer.

The patent application was filed on March 31, 2011 (13/077,419).

Measuring media performance associated with adjacent track interference
WD Media, LLC, San Jose, CA, has been assigned a patent (9,025,264) developed by Desai, Mrugesh, San Jose, CA, Gee, Harold H., San Jose, CA, and Nichols, Mark A., San Jose, CA, for a “methods for measuring media performance associated with adjacent track interference.”

The abstract of the patent published by the U.S. Patent and Trademark Office states: ”Methods for measuring media performance associated with adjacent track interference are provided. One such method includes iteratively writing data to a target track for each of a plurality of n frequencies, measuring a first signal amplitude and a first noise for each of the n sectors on the target track, writing an aggressor track pattern proximate the target track, measuring a second signal amplitude and a second noise for each of the n sectors on the target track, calculating a weighted sum for each of the signal amplitude measurements for each of the plurality of n frequencies, and calculating a weighted sum for each of the noise measurements for each of the plurality of n frequencies, and repeating the writing the aggressor track pattern, the measuring the second signal amplitude and the second noise, and calculating the weighted sums for preselected numbers of times.

The patent application was filed on March 28, 2014 (14/228,553).

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