Tdk Electronics Company, Limited

Tdk Corporation

Toshiaki Izumi

Seitoku Saito

Takayoshi Kobuke

Kiyoshi Noguchi

Hiroshi Sugihara

Fumio Maruta

Kazumasa Fukuda

Masatoshi Nakayama

Misao Kohmoto

Yuichi Kubota

Haruyuki Morita

Yasumichi Tokuoka

Kazuo Takada

Yasuta Taketomi

Minoru Kameya

Hisae Shimizu

A magnetic recording medium is provided comprising a flexible substrate and a ferromagnetic metal thin film layer on the substrate primarily comprising cobalt. When coercive force is measured by changing the measuring direction in a plane defined by a longitudinal direction of the substrate and a direction normal to the major surface of the substrate, the following relationship is met:

Magnetic recording medium of particular coercive force, filling ratio,

A magnetic recording medium is coated, over its magnetic layer, with a thin film of a siloxane-linkage-containing polymer. The magnetic layer consists of a thin film formed by vacuum evaporation or sputtering or by dispersion of a ferromagnetic metal powder in a binder. The polymer having the siloxane linkage is prepared by polymerizing an organo-silicon compound which either inherently possesses the linkage or is capable of producing it. The polymerization is preferably effected by the plasma polymerization technique.

Magnetic recording medium

In a magnetic recording medium comprising a length of a non-magnetic plastic substrate and a magnetic thin layer of Co or Co-Ni or Co-Ni-Cr formed thereon, when the coercive force of the medium is measured by changing the measuring direction in a plane defined by a longitudinal direction of the substrate and a direction normal to the major surface of the substrate, the following relationship is met:

A magnetic recording medium having a subbing metal layer formed by sputtering under a thin magnetic layer formed by vapor deposition possesses excellent magnetic properties and high surface hardness. The presence of the subbing layer improves the adhesion of the thin magnetic layer to the support.

A magnetic recording medium comprises a base, a thin ferromagnetic metal film, and a plasma-polymerized organic material layer sandwiched between them. The plasma-polymer is made of an organic metal and the layer is not less than 10 .ANG. thick. The ferromagnetic metal film is composed mainly of a cobalt-nickel alloy and formed by vacuum deposition.

Magnetic recording medium having an organic metal underlayer

A magnetic recording medium has plural magnetic layers on a non-magnetic substrate. The magnetic particles are orientated in substantially the same tilt direction for major axes of the particles in each magnetic layer and in cross tilt directions for major axes of the particles in the adjacent magnetic layers.

A magnetic recording medium comprises a thin metallic magnetic layer on a non-magnetic substrate wherein said thin metallic magnetic layer is made of cobalt, nickel and chromium.

A magnetic recording medium having a ferromagnetic layer formed by oblique vapor deposition wherein the residual magnetic flux density in the width direction of the recording medium is larger than the residual magnetic flux density in the longitudinal direction shows the SN ratio in a practical level at recording in the width direction.

Magnetic recording media and process of producing them

A thin metallic layer type magnetic recording medium having thin metallic layers in a structure comprises a layer in which a tilt angle of a metallic particle direction to the normal line to said substrate gradually increases depending upon an increase of a distance from said substrate; and a layer in which a tilt angle of a metallic particle direction to the normal line to said substrate gradually decreases depending upon an increase of a distance from said substrate.

Magnetic recording medium and apparatus for preparing the same

A magnetic recording medium having multi-layer structure of two or more thin metallic layers on a substrate. The orientations of metallic particles are different for each of said thin metallic layers.

Magnetic recording medium with stepwise orientation of deposited

A magnetic recording medium is prepared by a tilt vapor deposition of magnetic particles from a vapor thereof on a substrate running along a peripheral surface of a cylindrical can in vacuum wherein plural cans are used to deposit said magnetic particles at substantially the same tilt angle on each of said cans.

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Tokyo, Japan

Toshiaki Izumi