Home | Links | Contact Us | More About Intellectual Property | Bookmark

Search patents:

Home

Metal Working

Magnetic-recording-medium

Nickel alloy

OF PREFERRED EMBODIMENT The alloy of the present invention comprises 8 to 34 atom% of Al, 2 to 70 ...

Magneto-optic memory allowing direct overwrite of data

In accordance with the present invention, a magneto-optic media is described comprising a first ...

Thin-film recording medium with soft magnetic layer

In one aspect, the invention includes an improvement in a longitudinal magnetic recording medium ...

Metal thin film magnetic recording medium and manufacturing method thereof

As has been described above, the isotropic texture has been formed for decreasing the flying height ...

Fuel cells employing integrated fluid management platelet technology

OF THE BEST MODE The following detailed description illustrates the invention by way of example, ...

Liftable driver's seat for automobiles

It is a primary object of the present invention to provide a driver's seat for automobiles which ...

Seat adjuster

The embodiments of the invention in which an exclusive property or privilege is claimed are defined ...

Self-stripping electrical connector and terminal

According to the present invention, there is provided an electrical connector for insulated wires ...

Insulated wire termination device

OF THE INVENTION Referring now to the drawings, FIG. 1 illustrates partially in section an ...

Connector mechanisms

OF THE EMBODIMENTS Returning to the embodiments illustrated in FIGS. 1 to 5 of the drawings and ...

Magnetic recording medium

Details

Inventors: Funabashi, Makoto; Abe, Naoto; Sasazawa, Koji;
Assignee: Fuji Photo Film Co., Ltd. (Kanagawa, JP)
Primary Examiner: Thibodeau; Paul J.
Assistant Examiner: Kiliman; L.
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas

A magnetic recording medium providing a high reproducing output and a high C/N over a wide recording frequency region is disclosed. The magnetic recording medium comprises a non-magnetic substrate and a lower magnetic layer, a non-magnetic intermediate layer and an upper magnetic layer on the substrate in this order so that the ratio of the non-magnetic intermediate layer thickness (t) to the upper magnetic layer thickness (d), i.e., (t/d), is within the range of 0.1/1 to 0.3/1.

DETAILED DESCRIPTION An object of the present invention is to provide a ferromagnetic metal thin film type of magnetic recording medium which permits one to obtain a high reproducing output and a high C/N over a broad recording frequency region, i.
e.
, from a longer wavelength side to a shorter wavelength side.
The present invention relates to a magnetic recording medium comprising a non-magnetic substrate and a magnetic layer comprising a ferromagnetic metal thin film on the substrate, wherein the ferromagnetic metal thin film is formed by laminating a lower magnetic layer, a non-magnetic intermediate layer having a thickness of t, and an upper magnetic layer having a thickness of d in this order on the non-magnetic substrate so that the t/d is within the range of 0.
1/1 to 0.
3/1.
It has been found according to the present invention that the above object is attained by optimizing the relation among magnetic characteristics of the upper magnetic layer, the thickness of the non-magnetic intermediate layer and magnetic characteristics of the lower magnetic layer.
Based on the findings, the present invention has been completed.

Related patents

	Magneto-resistive head using flux guide What is claimed is: 1. A separate type magneto-resistive head for magnetically reproducing an output from a recording medium, including a magneto-resistive layer ...
	Longitudinal magnetic recording media and magnetic memory units As discussed above, it may be said that there have been strong demands for highly reliable magnetic recording media which further permit high S/N ratio and high density ...
	Thin-film recording medium with thin metal sublayer The present invention includes, in one aspect, an improvement in a magnetic film recording medium of the type having (a) a disc-like non-metallic substrate, (b) a ...
	Process of making a magnetic recording medium We claim: 1. A process for the manufacture of a magnetic recording medium by vacuum-depositing a recording layer of an Sm-Co alloy onto a non-magnetic base which is ...
	Magnetic recording disk and sputtering process and apparatus for producing same The present invention provides a continuous production from a direct current planar magnetron sputtering apparatus for the mass production of magnetic thin film memory ...
	Method of forming thin-film recording medium It is one general object of the invention to provide a thin film medium having high coercivity, remanence, and loop squareness. It is another object of the invention to ...
	Longitudinal magnetic recording media with fine grain crystal magnetic layer OF THE EMBODIMENTS The surface of a disk substrate of an aluminum alloy containing 4% by weight of magnesium was made smooth by machining so that the substrate had an ...
	Magnetic recording medium comprising an underlayer and a cobalt samarium amorphous magnetic layer having a SmCo.sub.5 crystalline interface with the underlayer The present invention pertains to a thin film media structure for high density longitudinal magnetic recording. The thin film media structure is comprised of a substrate....
	Oxidation resistant low expansion superalloys The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 1. An oxidation resistant alloy having a relatively low ...
	Electric contact material and a manufacturing method therefor OF THE INVENTION As shown in the sectional view of the FIGURE, an electric contact material according to the present invention is composed of a contact substrate 1 and ...

0.014
Archive: All patents - Links Copyright (c)2006 Eipa-patents.org - All rights reserved