Hgst Netherlands, B.v.

Hitachi Global Storage Technologies Netherlands B.v.

Franck Rose

Oleksandr Mosendz

Qing Dai

Simone Pisana

James William Reiner

Dieter Klaus Weller

Kurt A Rubin

Bruno Jean Marchon

Ricardo Ruiz

Xiaoping Bian

Hans Juergen Richter

Charles Mathew Mate

Vipin Ayanoor-Vitikkate

Daryl J Pocker

Sripathi Vangipuram Canchi

Qi-Fan Xiao

Run-Han Wang

Hitesh Arora

Tushar Keshubhai Suther

Steven Gary Schmid

A method for etching a media is disclosed. A first magnetic layer comprising grains is deposited with a segregant such that a portion of the first segregant covers a top surface of the grains of the first magnetic layer and a second portion of the first segregant separates the grains of the first magnetic layer. The first segregant is etched to remove the portion of the first segregant that covers the top surface of the grains.

Media etch process

A method to fabricate an imprint template for bit-patterned magnetic recording media using block copolymers (BCPs) integrates data region patterning and servo region patterning. A heat sink layer is formed on the imprint substrate only in the data regions. A sublayer for the BCP is deposited over both the data regions and the servo regions and patterned to form stripes in the data regions and servo features in the servo regions. A BCP is then deposited in both the data and servo regions. Only the BCP in the data regions is heated, which causes phase separation of the BCP in the data regions into the two BCP components. The selective heating may be accomplished by directed controlled laser radiation to only the data regions. The heat sink layer below the data regions absorbs the heat from the laser radiation, confining it to the data regions.

Method for making an imprint template with data regions and non-data regions using block copolymers

A vacuum planarization method substantially improves the surface roughness of a thermally-assisted recording (TAR) disk that has a recording layer (RL) formed of a substantially chemically-ordered FePt alloy or FePt-X alloy (or CoPt alloy or CoPt-X alloy) and a segregant, like SiO. A first amorphous carbon overcoat (OC) is deposited on the RL and etched with a non-chemically reactive plasma to remove at least one-half the thickness of OC. Then a second amorphous carbon overcoat (OC) is deposited on the etched OC. The OCis then reactive-ion-etched, for example in a H/Ar plasma, to remove at least one-half the thickness of OC. A thin third overcoat (OC) may be deposited on the etched OC

Method for planarizing a perpendicular magnetic recording disk for thermally-assisted recording (TAR)

A magnetic media disk has a substrate; a recording magnetic media on the substrate; and an overcoat on the recording magnetic media, the overcoat comprising a Si-based layer on the recording magnetic media, and a Ti-based layer on the Si-based layer. The magnetic media disk may be rotatably mounted to an enclosure in a hard disk drive.

Magnetic media disk anticorrosion overcoat with titanium and silicon based layers

A method of making a thermally-assisted recording (TAR) disk includes etching an initial layer of generally spherically shaped FePt grains encapsulated by shells of graphitic carbon layers. The etching partially or completely removes the carbon layers on the tops of the shells, exposing the FePt grains while leaving carbon segregant material between the FePt grains. Additional Fe, Pt and C are then simultaneously deposited. The additional Fe and Pt grow on the exposed FePt grains and increase the vertical height of the grains, resulting in growth of columnar FePt grains. The additional C forms on top of the grains that together with the intergranular carbon form larger carbon shells. The resulting FePt grains thus have a generally columnar shape with perpendicular magnetic anisotropy, rather than a generally spherical shape. Lateral grain isolation is maintained by the carbon segregant remaining between the grains.

Method for making a perpendicular thermally-assisted recording (TAR) magnetic recording disk having a carbon segregant

A magnetic recording disk with pre-patterned surface features of elevated lands and recessed grooves or trenches, like a discrete-track media (DTM) or bit-patterned media (BPM) disk, has a planarized surface. A multilayered disk overcoat is used to protect the recording layer, and at least one of the overcoat layers functions as a stop layer for terminating a chemical-mechanical polishing (CMP) process that substantially planarizes the disk. All of the layers of the multilayered overcoat are located above the lands, but none of the overcoat layers, or a number of layers less than the number of layers over the lands, is located above the recesses.

Magnetic recording disk having pre-patterned surface features and planarized surface

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San Jose, CA, United States of America

Franck Rose