Sony Corporation

Hitoshi Wako

Takashi Kanou

Ryoichi Hiratsuka

Hidetoshi Honda

Shinya Yoshida

Satoshi Sekino

Kazuhiko Suzuki

Seiichi Onodera

Tomoe Sato

Tetsuo Samoto

Naoki Ikeda

The present invention is to provide a method of fabricating a magnetic recording medium capable of forming a protective layer with a stable performance even in a case where a thickness thereof is as thin as 100 nm or less, and a magnetic recording medium fabricated by the method. A magnetic recording medium is fabricated in the following manner, that is, a magnetic layer having a ferromagnetic metal thin film having a thickness as thin as 100 nm or less is formed on one main surface of a long non-magnetic support, and on the magnetic layer, a protective layer containing carbon is formed by the chemical vapor deposition process using an ion source equipped with a hollow cathode.

Magnetic recording medium and method of fabricating the same

A magnetic recording medium having high C/N ratio characteristics particularly in a short wavelength range and capable of attaining a further higher-density recording as a magnetic recording tape produced by forming a magnetic layer by a vapor deposition method and other magnetic recording media of the next generation and a method of producing the same, wherein a magnetic layer is formed by a vapor deposition method on a nonmagnetic supporting body made of a polymer substrate, which has a configuration of comprising a nonmagnetic supporting body, an under layer formed on the nonmagnetic supporting body, containing Co and O and having an atomic ratio of O/Co of 0.4 or more and a magnetic layer containing Co and O, wherein the film thickness of the under layer is made 50 nm or less and the maximum incident angle is made 70&#xb0; or less in the vapor deposition method.

Magnetic recording medium and method of producing the 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

There is provided a magnetic recording medium which exhibits superior lubricating properties and superior tape-transport properties as well as superior robustness even in a low-temperature environment. A magnetic layer containing a ferromagnetic metal is formed on a nonmagnetic support, and a protecting film is formed on the magnetic layer. A lubricant auxiliary coating composition comprising an aromatic alcohol is applied to the protecting film to form a lubricant auxiliary layer, and a lubricant coating composition comprising a compound represented by the formula (1) below is applied to the lubricant auxiliary layer to form a lubricant layer.RCH(COOR)CHCOOR&#x2003;&#x2003;(1)wherein Rrepresents an aliphatic alkyl group, an aliphatic alkenyl group, or a hydrogen atom, and each of Rand Rindependently represents a fluoroalkyl group, a fluoroalkenyl group, a fluoropolyether group, or a hydrogen atom.

Magnetic recording medium

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.

Growing community of inventors

Miyagi, Japan

Hitoshi Wako