Wd Media, LLC

Hong-Sik Jung

Gerardo Bertero

Sudhir S Malhotra

B Ramamurthy Acharya

Donald C Stafford

Emur M Velu

Jackie Tsoi Jung

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.

Perpendicular magnetic recording medium with single domain exchange-coupled soft magnetic underlayer and device incorporating same

A perpendicular magnetic recording (PMR) media including a non-magnetic or superparamagnetic grain isolation magnetic anisotropy layer (GIMAL) to provide a template for initially well-isolated small grain microstructure as well as improvement of Kin core grains of a magnetic recording layer. The GIMAL composition may be adjusted to have lattice parameters similar to a bottom magnetic recording layer and to provide a buffer for reducing interface strains caused by lattice mismatch between the bottom magnetic recording layer and an underlying layer.

Perpendicular magnetic recording medium with grain isolation magnetic anistropy layer

Method of incorporating atomic oxygen into a magnetic recording layer by sputtering a target containing an oxide of cobalt. The oxide of cobalt may be sputtered to provide a readily dissociable source of oxygen which may increase the concentration of free cobalt atoms (Co) in the magnetic recording layer and also increase oxide content in the magnetic recording layer.

Sputtered cobalt oxide for perpendicular magnetic recording medium with low media noise

A radial magnetic field reset apparatus including a housing having a cavity with a soft magnet rod disposed at its center and a permanent magnet disposed around the cavity. The cavity and thickness of the soft magnet rod are sized to permit a cassette of disks to be inserted into the housing with the soft magnet rod disposed within the inner diameter holes of the disks contained in the cassette. The soft magnet rod at the center of the housing attracts the magnetic field generated by the permanent magnet, which results in a substantially uniform, radial magnetic field inside the housing.

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Pleasanton, CA, United States of America

Hong-Sik Jung