Hitachi Global Storage Technologies Netherlands B.v.

International Business Machines Corporation

Hgst Netherlands, B.v.

Western Digital Technologies, Inc.

Other

Xiaoping Bian

Mohammad Taghi Mirzamaani

Mary Frances Doerner

Kai Tang

Tim Minvielle

Qing Dai

Kentaro Takano

Jinshan Li

Qi-Fan Xiao

Jack Jyh-Kau Chang

Hoa Van Do

Shanlin Duan

Yoshihiro Ikeda

Mary Frances Minardi

Adam Polcyn

Barry C Stipe

Zhupei Shi

Chu S Tran

Mark F Mercado

Alan C Lam

Kurt A Rubin

Ernesto Esteban Marinero

David Thomas Margulies

Tetsuya Kanbe

James Aloysius Hagan

Natacha Frederique Supper

Andreas Klaus Berger

Timothy Martin Reith

Richard Longstreth White

Li Tang

Oleksandr Mosendz

Run-Han Wang

Franck Rose

Min Xiao

Jack Chang

Jyh-Kau Chang

Weikang Shen

Chon Ngoc Vo

Mohammad S Mirzamaani

An apparatus, according to one embodiment, comprises a near field transducer; an adhesion layer on a media facing side of the near field transducer, the adhesion layer comprising Ni and Cr; and a protective layer on a media facing side of the adhesion layer. Other apparatuses, systems and methods are described in additional embodiments.

Near field transducer having an adhesion layer coupled thereto

A system, according to one embodiment, includes a near field transducer; an adhesion layer on a media facing side of the near field transducer, the adhesion layer comprising Ni and Cr; and a protective layer on a media facing side of the adhesion layer. Other systems and methods are described in additional embodiments.

A magnetic storage medium according to one embodiment includes a substrate; an onset layer formed above the substrate, the onset layer comprising ruthenium and titanium oxide; and a magnetic oxide layer formed directly on the onset layer. A method according to one embodiment includes sputtering using a target of ruthenium and titanium oxide for forming an onset layer above a substrate, the onset layer comprising ruthenium and titanium oxide; and forming a magnetic oxide layer directly on the onset layer. Additional systems and methods are also presented.

Onset layer for perpendicular magnetic recording media

The present disclosure relates to a planarized bit-patterned magnetic medium that has a magnetic layer, including island regions and trench regions, a first carbon layer applied over the magnetic layer, and a second carbon layer applied over the first carbon layer, wherein the second carbon layer has been removed in the island regions. The first carbon layer may have a lower material removal rate when exposed to chemical-mechanical polishing than the second carbon layer. The present disclosure also relates to a method for planarizing a bit-patterned magnetic medium and a slurry composition for the chemical-mechanical polishing of carbon layers, the slurry composition including an oxidizer component, a catalyst component, a particulate component, and a reaction control component.

Composition and method for planarized bit-patterned magnetic media

Perpendicular magnetic recording media has been enhanced by controlling the initial growth of magnetic oxide layers and increased magnetic isolation between the grains in the initial magnetic layer. An onset magnetic oxide layer is sputter deposited in an argon-oxygen gas mixture between the main CoPtCr-oxide magnetic layers and the underlying Ru layer. The insertion of the onset magnetic oxide layer enhances the coercivity of the oxide magnetic layers and also improves the nucleation field. The media signal-to-noise ratio and bit error rate also are significantly improved due to the improvement of the initial segregation of Co magnetic grains in the magnetic oxide layers.

System, method and apparatus for onset magnetic oxide layer for high performance perpendicular magnetic recording media

A method according to one embodiment includes forming a high Ku first oxide magnetic layer above a substrate by sputtering; forming a low Ku second oxide magnetic layer above the first oxide magnetic layer by sputtering; forming an exchange coupling layer of CoCrPt-oxide above the second oxide magnetic layer; and forming a magnetic cap layer above the exchange coupling layer. Additional systems and methods are also presented.

Perpendicular magnetic recording media with oxide-containing exchange coupling layer

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)

Perpendicular magnetic recording (PMR) media and methods of fabricating PMR media are described. The PMR media includes, among other layers, an underlayer, a first onset layer on the underlayer, a second onset layer on the first onset layer, and a perpendicular magnetic recording layer on the second onset layer. The second onset layer has a magnetic moment which is higher than both a magnetic moment of the first onset layer and a magnetic moment of the perpendicular magnetic recording layer.

Perpendicular magnetic recording media having a dual onset layer

A magnetic storage medium according to one embodiment includes a substrate; a first oxide magnetic layer formed above the substrate; a second oxide magnetic layer formed above the first oxide magnetic layer; an exchange coupling layer formed above the second oxide magnetic layer, the exchange coupling layer comprising an oxide; and a magnetic cap layer formed above the exchange coupling layer. A method according to one embodiment includes forming a high Ku first oxide magnetic layer above a substrate by sputtering; forming a low Ku second oxide magnetic layer above the first oxide magnetic layer by sputtering; forming an exchange coupling layer of CoCrPt-oxide above the second oxide magnetic layer; and forming a magnetic cap layer above the exchange coupling layer. Additional systems and methods are also presented.

An improved structure for the construction of perpendicular recording media is disclosed. The structure includes a perpendicular recording layer with at least two oxide sublayers or a lower sublayer of a non-oxide. One structure includes an upper sublayer comprised of a Silicon-oxide, while a lower sublayer is comprised of a Tantalum-oxide. The structures provide for increased coercivity and corrosion resistance.

Oxide magnetic recording layers for perpendicular recording media

Perpendicular magnetic recording media and methods of fabricating perpendicular magnetic recording media are described. The perpendicular magnetic recording medium of one embodiment includes an interlayer, an underlayer, and a perpendicular magnetic recording layer. The interlayer is formed from a NiWCr alloy.

Perpendicular magnetic recording medium having an interlayer formed from a NiWCr alloy

A perpendicular magnetic recording medium has an 'exchange-spring' type magnetic recording layer (RL) with an improved coupling layer (CL). The RL includes the first or lower ferromagnetic layer MAG, sometimes called the 'media' layer, the second or upper ferromagnetic layer MAG, sometimes called the &#x201c;exchange-spring&#x201d; layer, and the intermediate CL that provides ferromagnetic exchange coupling between MAGand MAG. The CL is formed of NiCr or RuCr based alloys, or CoCr or CoCrB alloys with high Cr and/or B content (Cr plus B&#x3e;about 25 atomic percent), or RuCoCr alloys with low Co content (&#x3c;about 65 atomic percent). For each CL composition there is a CL thickness range that provides the optimal interlayer exchange coupling between MAGand MAG. The selected CL materials provide an exchange-type perpendicular magnetic recording medium with good magnetic performance, while the relatively high amount of Cr of the CL improves the corrosion resistance of the medium.

Perpendicular magnetic recording medium with exchange-coupled magnetic layers and improved coupling layer

An antiferromagnetically coupled (AFC) magnetic recording medium with an AFC master layer comprising at least two magnetic layers with the top magnetic layer including copper is described. The slave layer is separated from the master layer structure by a nonmagnetic spacer layer selected to antiferromagnetically couple the layers. The master layer structure according to the invention includes a bottom and top layer of distinct ferromagnetic materials. Preferably, the top layer of the master layer is a cobalt alloy including from 1 to 5 at. % copper with an example being CoPtCrBCu. The AFC magnetic layer structure can be used with a variety of substrates including circumferentially textured glass and NiP/AlMg.

Magnetic recording disk with antiferromagnetically coupled master layer including copper

A thin film disk for use in magnetic recording with an underlayer structure that includes a layer of CrMoZr, CrMoNb or CrMoMn is described. The preferred embodiment includes a circumferentially textured glass substrate, a pre-seed layer, a B2 seed layer, an underlayer structure and a magnetic layer stack with a plurality of layers. The preferred underlayer structure has a first underlayer of CrTi followed by a second underlayer of CrMoZr. The preferred B2 seed layer material is RuAl. The preferred pre-seed layer is CrTiAl. The preferred magnetic layer stack is CoCr/CoPtCrB/CoPtCrBCu. The preferred embodiment is useful for longitudinal magnetic recording. The in-plane crystallographic orientation, the Mrt orientation ratio and the media SNR are improved by the inclusion of the CrMoZr, CrMoNb or CrMoMn according to the invention.

Magnetic thin film media with an underlayer of CrMoZr, CrMoNb or CrMoMn

The applicants disclose a thin film magnetic media structure with a pre-seed layer of CrTiAl. The CrTiAl pre-seed layer presents an amorphous or nanocrystalline structure. The CrTiAl pre-seed layer improves in-plane c-axis orientation while maintaining a good orientation ratio. The pulse transition width (PW50) is narrowed and the soft error rate is improved. The preferred seed layer is RuAl.

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Saratoga, CA, United States of America

Xiaoping Bian