Kabushiki Kaisha Toshiba

Canon Kabushiki Kaisha

Showa Denko K.k.

Ajinomoto Co., Ltd.

Takeshi Iwasaki

Hiroyuki Inoue

Takashi Nojima

Akira Kida

Hitoshi Nakamura

Hideaki Kawakami

Soichi Hiramatsu

Hideki Yamaguchi

Soichi Oikawa

Tomoyuki Maeda

Kaori Kimura

Hiroshi Sakai

Akira Sakawaki

Kenji Shimizu

Futoshi Nakamura

Noriko Kawasaki

Kazutaka Takizawa

Koh Hasegawa

Akihiko Takeo

Akira Watanabe

Shinya Asano

Takashi Hikosaka

Takehiko Kiyohara

Akira Kikitsu

Noriko Sato

Masahito Yoshida

Yasufumi Tanaami

Yasuyuki Hirai

Shusuke Inamura

Yasuo Kotaki

Naoji Otsuka

Hitoshi Sugimoto

Toshihiko Ujita

Sadayuki Sugama

Masatoshi Sakurai

Keiichiro Tsukuda

Takeshi Yazawa

Akihiro Yamanaka

Yoshiyuki Kamata

Akira Fujimoto

Osamu Asakura

Kazuo Kobayashi

Atsushi Noda

Hirohide Matsuhisa

Yasushi Koike

Hiroyuki Hyodo

Tsuyoshi Onitsuka

Shoji Akino

Izumi Uraki

Mizuko Matsumoto

Takeshi Bungo

Katsuyuki Yokoi

Seiji Takahashi

Masahiro Takashita

Akira Miyakawa

Naohiro Miyamura

Motonaka Kuroda

Masanori Kohmura

Heiichiro Tsukuda

According to one embodiment, a magnetic recording medium including a substrate and a magnetic recording layer formed on the substrate and including a plurality of projections is obtained. The array of the plurality of projections includes a plurality of domains in which the projections are regularly arranged, and a boundary region between the domains, in which the projections are irregularly arranged. The boundary region is formed along a perpendicular bisector of a line connecting the barycenters of adjacent projections.

Magnetic recording medium and method of manufacturing the same

A perpendicular magnetic recording medium according to an embodiment includes a substrate and perpendicular magnetic recording layer. The perpendicular magnetic recording layer includes a recording portion and non-recording portion. The recording portion has patterns regularly arranged in the longitudinal direction, and includes magnetic layers containing Fe or Co and Pt as main components, and at least one additive component selected from Ti, Si, Al, and W. The non-recording portion includes oxide layers formed by oxidizing the side surfaces of the magnetic layers, and nonmagnetic layers formed between the oxide layers.

Perpendicular magnetic recording medium, method of manufacturing the same, and magnetic recording/reproduction apparatus

According to one embodiment, a magnetic recording medium with high magnetic recording characteristics and improved corrosion resistance is obtained. The magnetic recording medium includes a substrate, an orientation control layer provided on the substrate and made from a Ni alloy or an Ag alloy, a nonmagnetic seed layer provided to be in contact with the orientation control layer, a perpendicular magnetic recording layer containing Fe or Co and Pt as main components. The nonmagnetic seed layer is formed of Ag particles, Ge grain boundaries and a compound X, and the compound X is selected from an oxide, nitride or carbide of aluminum, titanium, chromium, silicon and tantalum and also distributed in both the Ag particles and Ge grain boundaries.

Magnetic recording medium and magnetic recording and reproduction device

According to one embodiment, there is provided a magnetic recording medium manufacturing method including forming a bonding layer on a substrate, forming a holding layer containing silicon on the bonding layer, forming a single-particle layer on the holding layer using particles containing metal fusible on the bonding layer, etching SiOin the holding layer using an etching solution containing HF and HO, filling the holding layer with the particles until the particles are brought into contact with the bonding layer, bonding the particles and the bonding layer together by heating, and forming a magnetic recording layer on the single-particle layer.

Magnetic recording medium manufacturing method

According to one embodiment, a magnetic recording medium includes an orientation control layer formed on a non-magnetic substrate, the orientation control layer made of a Ni alloy or Ag alloy having fcc structure, a non-magnetic seed layer made of Ag, Ge, and a metal X selected from the group consisting of Al, Mg, Au, and Ti, a non-magnetic intermediate layer made of Ru or Ru alloy, and a magnetic recording layer. The orientation control layer is in contact with the non-magnetic seed layer.

Magnetic recording medium and magnetic recording and reproducing apparatus

According to one embodiment, a perpendicular magnetic recording medium has an arrangement obtained by sequentially stacking a nonmagnetic substrate, a soft magnetic underlayer, a nonmagnetic seed layer containing silver grains having an fcc structure and an amorphous germanium grain boundary formed between the silver grains, a reaction barrier layer containing 90 at % or more of silver or aluminum and having a thickness of 2 nm or less, a nonmagnetic interlayer formed on the reaction barrier layer and made of ruthenium or a ruthenium alloy, and a perpendicular magnetic recording layer.

Magnetic recording medium and magnetic recording/reproduction apparatus

According to one embodiment, there is provided a method for forming a pattern including forming an island-like metal underlayer comprised of a first metal, a phase-separated release layer including a first metal, a second metal, and a metal oxide, a mask layer, and a resist layer on a processed layer in this order, forming a concave-convex pattern on the resist layer, transferring the pattern to the mask layer, the phase-separated release layer, and the processed layer in this order, dissolving the phase-separated release layer using a peeling liquid for dissolving the first metal and the second metal, and removing the mask layer from the processed layer to expose the concave-convex pattern.

Method for forming pattern, method for producing magnetic recording medium using the same, magnetic recording medium, and method for producing stamper

According to one embodiment, a perpendicular magnetic recording medium is provided, which includes a non-magnetic granular underlayer formed on a substrate and containing metal grains of a first metal and a grain boundary layer surrounding the metal grains, each metal grain including a projection projecting from the boundary layer and a bottom portion embedded in the grain boundary layer, and a contact angle of the edge of the projection to the surface of the grain boundary layer being 45&#xb0; to 85&#xb0;, a non-magnetic intermediate layer formed on a surface of each projection and a magnetic recording layer having a projection pattern formed on the basis of a pattern of the projections in the non-magnetic intermediate layer via the non-magnetic intermediate layer.

Perpendicular magnetic recording medium

According to one embodiment, a pattern formation method includes steps of forming a layer to be processed on a substrate, forming a metal microparticle layer by coating the layer to be processed with a metal microparticle coating solution containing metal microparticles and a solvent, reducing a protective group amount around the metal microparticles by first etching, forming a protective layer by exposing the substrate to a gas containing C and F and adsorbing the gas around the metal microparticles to obtain a projection pattern, and transferring the projection pattern to the layer to be processed by second etching.

Pattern formation method, stamper manufacturing method, and magnetic recording medium manufacturing method

According to one embodiment, provided is a perpendicular magnetic recording medium including an orientation control layer formed on a non-magnetic substrate, the orientation control layer consisting of a Ni alloy having fcc structure, non-magnetic buffer layer containing silver having fcc structure, non-magnetic seed layer consisting of Ag particles having fcc structure and amorphous Ge grain boundaries between the Ag particles, non-magnetic intermediate layer consisting of Ru or Ru alloy, and perpendicular magnetic recording layer, wherein the orientation control layer contacts the non-magnetic buffer layer, and the non-magnetic buffer layer contacts the non-magnetic seed layer.

Perpendicular magnetic recording medium and magnetic recording and reproducing apparatus

According to at least one embodiment, a metal peelable layer and a mask layer are formed on a magnetic recording layer, then, a projections pattern is formed on the mask layer, the projections pattern is transferred to the metal peelable layer and the magnetic recording layer in this order, and then the metal peelable layer is dissolved and removed by a solvent. The metal peelable layer is constituted of any of aluminum and an aluminum compound. An alkali solution is used as the solvent.

Method for producing magnetic recording medium

A manufacturing method of a magnetic recording medium includes follows: forming a magnetic recording layer on a substrate; forming an under layer and a metal release layer that forms an alloy with the under layer on the magnetic recording layer in this order and forming an alloyed release layer by alloying the under layer and the metal release layer; forming a mask layer on the alloyed release layer; forming a resist layer on the mask layer; providing a protrusion-recess pattern by patterning the resist layer; transferring the protrusion-recess pattern to the mask layer; transferring the protrusion-recess pattern to the alloyed release layer; transferring the protrusion-recess pattern to the magnetic recording layer; dissolving the alloyed release layer by using a stripping solution and removing a layer formed on the alloyed release layer from an upper side of the magnetic recording layer.

Magnetic recording medium and method of manufacturing

According to one embodiment, a magnetic recording medium is formed by performing gas ion irradiation by using a magnetism deactivating gas on a stack including a perpendicular magnetic recording layer, an Ru nonmagnetic underlayer containing a magnetism deactivating element selected from chromium, titanium, and silicon, and a nonmagnetic substrate. Before gas ion irradiation, the perpendicular magnetic recording layer contains platinum and at least one of iron and cobalt. Gas ion irradiation is performed using nitrogen gas alone or a gas mixture of nitrogen gas and at least one gas selected from the group consisting of helium, hydrogen, and BH.

Magnetic recording medium, method of manufacturing the same, and magnetic recording/reproduction apparatus

According to one embodiment, there is provided a magnetic recording medium which includes a base, a magnetic recording layer having convex-shaped magnetic layers, which is formed on the base, and a protective film formed on the magnetic recording layer. There are gaps in a region surrounded by the protective film, the surface of the base, and each side wall of each magnetic layer.

Magnetic recording medium and method for producing the same

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Kawasaki, Japan

Takeshi Iwasaki