Sony Corporation

Ryoichi Hiratsuka

Tomoe Ozaki

Ichiro Kanagawa

Noboru Sekiguchi

Hidetoshi Honda

Kasumi Suzuki

Tetsuo Endo

Junichi Tachibana

Takashi Aizawa

Takahiro Kawana

Yukari Yamada

Atsuhiro Abe

Hitoshi Wako

Satoshi Sekino

Teruo Sai

Takashi Kanou

Hiroshi Hayashi

Kazuhiko Suzuki

Jun Sasaki

Koji Suzuki

Yoichi Kanemaki

Kazuya Hashimoto

Jota Ito

Taketoshi Sato

Shunji Amano

Kikuji Kawakami

Yukihiro Koshika

Yoshihito Ebine

Kazuo Hoshi

Miho Abiko

Hiroto Atagi

Yuka Ito

A magnetic recording medium includes a flexible and elongated substrate, a soft magnetic layer having an average thickness of 10 nm or more to 50 nm or less, and a recording layer. The soft magnetic layer is disposed between the substrate and the recording layer, and a difference in Young's modulus between the magnetic recording medium and the substrate in a longitudinal direction of the substrate is 2.4 GPa or more.

Magnetic recording medium

A tape-like magnetic recording medium includes a reinforced substrate, and a recording layer arranged on the reinforced substrate, and the reinforced substrate includes a substrate that has a first face and a second face opposed to each other, and has an average thickness of 4 &#x3bc;m or smaller, and a metal layer that contains cobalt, arranged on the first face, the reinforced substrate by itself causing thereon a depth of indentation of 0.25 &#x3bc;m or shallower, when a 0.7-mm-diameter hard sphere is impressed against the second face under 5.0 gf load for 10 seconds.

Magnetic recording medium having reinforced substrate

There is provided a magnetic recording medium including a base; a seed layer; a foundation layer; and a recording layer, the seed layer being disposed between the base and the foundation layer, having an amorphous state, including an alloy containing Ti, Cr and O, a percentage of Ti being 30 atomic % to 100 atomic % based on a total amount of Ti and Cr contained in the seed layer, and a percentage of O being 15 atomic % or less based on a total amount of Ti, Cr and O contained in the seed layer. Also, a production method thereof is provided.

Magnetic recording medium and method of producing the same

Provided is a magnetic field generation apparatus including: two or more main magnetic pole portions configured to generate a main magnetic field; one or more secondary magnetic pole portions including a plurality of first divisional magnets obtained by a division, that generate a secondary magnetic field for adjusting the generated main magnetic field; and a yoke portion including one or more first yokes opposing the plurality of first divisional magnets in correspondence with the one or more secondary magnetic pole portions.

Magnetic field generation apparatus and sputtering apparatus

A magnetic recording medium includes a nonmagnetic support having a thickness less than 7 &#x3bc;m and a width of 8 mm; a ferromagnetic metal layer disposed on a surface of the nonmagnetic support; and a reinforcing layer disposed on the other surface of the nonmagnetic support. The magnetic recording medium has a flexural rigidity EI of 5.9&#xd7;10to 1.3&#xd7;10N&#xb7;m (6.0&#xd7;10to 1.3&#xd7;10g&#xb7;cm). The flexural rigidity EI is determined by the following equation:(&#x3c0;/4&#x2212;2/&#x3c0;)&#xb7;/d&#xb7;b&#xd7;9.8&#xd7;10(wherein W is a load that causes an annular test piece having a radius of a cm and a width of b cm which is prepared by cutting a magnetic sheet formed of the magnetic recording medium to undergo a radial displacement d of 0.2&#x3c0;a).

A method of manufacturing a metallic thin film type magnetic recording medium is provided. The method comprises the steps of arranging an initial substance of said recording medium in opposition to a plasma discharge electrode, said initial substance comprising a non-magnetic support base, a metallic layer capable of functioning as a metallic electrode formed on said non-magnetic support base and a metallic magnetic layer formed on said metallic layer, and forming a protection film on a surface of said initial substance of said recording medium by way of generating plasma discharge while feeding raw material gas between said metallic layer/said metallic magnetic layer and said plasma discharge electrode.

Metallic thin film type magnetic recording medium and method of manufacturing thereof

A magnetic recording medium of a metal thin-film type, which includes a magnetic layer and a carbon protective layer on a non-magnetic support member, and in which a non-magnetic metal thin-film is provided between the magnetic layer and the carbon protective layer, is provided. The magnetic recording medium thus produced can be run stably.

Magnetic recording medium and process for producing same

There is provided a cleaning tape capable of attaining sufficient cleaning effects while preventing electrostatic discharge damage to magnetoresistive heads or changes in reproduced output due to excessive head wear. The cleaning tape includes a non-magnetic substrate, surface protrusionsformed on the non-magnetic substratewith particleshaving a particle diameter of 10 to 40 nm at a density of 300&#xd7;10to 5000&#xd7;10mm, a metal evaporated film(preferably an electrically conductive layer such as an alloy layer containing Co as a primary component, an Al layer or the like) having a thickness of 10 to 200 nm and an inorganic protection filmhaving a thickness of 3 to 50 nm formed on the metal evaporated film

Cleaning tape with surface protrusions formed by particles of predetermined size/density and non-magnetic metal evaporated film of predetermined thickness

A cleaning tape comprising a nonmagnetic base film, an evaporated metal layer, specifically a magnetic layer or electroconductive layer, formed on the nonmagnetic base film, an inorganic protective film formed on the evaporated metal layer, and surface projections formed on the nonmagnetic base film by particles having a predetermined diameter and density. The tape has a low electric resistivity, a low head abrasion, and a sufficient cleaning effect suitable for cleaning a magnetoresistive type head.

Cleaning tape

A Raman spectrum of a thin film which must be formed is measured in a thin-film forming step for forming the thin film on a member to be processed in an atmosphere, the pressure of which has been reduced. Moreover, the conditions under which the thin film is formed are controlled in accordance with a result of measurement of the Raman spectrum. At this time, the measurement of the Raman spectrum is continuously performed in an in-line manner while the thin film is being continuously formed on the elongated-sheet-like member to be processed. The measurement of the Raman spectrum is performed while the focal point of a probe of a Raman spectrometer is being controlled with respect to the member to be processed or while the output of a laser beam from the Raman spectrometer is being controlled. The thin film which must be. formed is, for example, a protective film of a magnetic recording medium. The protective film is, for example, a hard carbon film (a DLC film).

Thin-film forming method and thin-film forming apparatus

It is to provide an apparatus for producing a thin film, a process for producing a thin film and a guide roller, in which an arc resistant property is provided, and the film formation can be stably conducted with preventing damage of the thin film thus formed. In an apparatus for producing a thin film, such as a plasma CVD apparatus, comprising a vacuum chamber, means for generating a plasma in the vacuum chamber, means for introducing a gas to the vacuum chamber, and a guide roller for running a material to be treated by winding and supporting in the vacuum chamber, an outer peripheral surface of the guide roller in contact and sliding with the material to be treated comprises an electric conductor on both end parts in a width direction of the guide roller, and an electric insulator on a central part thereof.

Apparatus for producing thin film, process for producing thin film and guide roller

A magnetic recording medium having an excellent sliding durability, and including a magnetic layer of a metal magnetic thin film formed on a non-magnetic support body and a carbon protection film formed on the magnetic layer. Recording and/or reproduction is carried out by sliding a magnetic head. The carbon protection film shows, in a Raman spectrum obtained by Raman spectrum analysis using an argon ion laser having a wavelength of 514.5 nm, an intensity ratio A/B of 2 or above for a main peak intensity A appearing in the vicinity of wave number 1550 cm.sup.-1 with respect to a background intensity B.

A magnetic recording medium having at least a thin magnetic metal film and a carbon protective film formed on a non-magnetic substrate, wherein lubricating properties are afforded to a surface portion of the carbon protective film. Specifically, the carbon protective film having a lower layer exhibiting rust-proofing properties and/or an upper layer exhibiting lubricating properties is formed on the thin magnetic metal film. The magnetic recording medium has a good running performance, durability and preservability.

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Miyagi, Japan

Ryoichi Hiratsuka