Thin-film magnetic head device

Details Thin-film magnetic head device Thin-film magnetic head device

1991-12-17

1993-06-29

Wolff, John H.

Dynamic magnetic information storage or retrieval

Head

Core

360125, G11B 5127, G11B 5147

Patent

active

052240029

ABSTRACT:
An object of the present invention is to provide a thin-film magnetic head device capable of magnetically writing magnetic signals into a magnetic recording medium having a high coercive force and reading the same therefrom. At least one of upper and lower magnetic layers is composed of a main magnetic layer and a sub magnetic layer. The sub magnetic layer has a saturation magnetic flux density of 1.5T or greater, a magnetic permeability of 1000 or less and an anisotropic magnetic field of 10 Oe or greater. The thickness of the sub magnetic layer should preferably be 0.5 .mu.m or less. According to the present invention, the sub magnetic layer can obtain a high saturation magnetic flux density and the main magnetic layer can attain a high magnetic permeability. With a thickness of 0.5 .mu.m or less, the sub magnetic layer can obtain a high saturation magnetic flux density without reducing the magnetic permeability.

REFERENCES:
patent: 4780779 (1988-10-01), Pisharody et al.
patent: 4780781 (1988-10-01), Sano et al.
patent: 5025342 (1991-06-01), Nagata et al.
patent: 5126907 (1992-06-01), Hamakawa et al.
patent: 5157570 (1992-10-01), Shukovsky et al.

Affiliated with

Also associated with

Rating

Thin-film magnetic head device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Thin-film magnetic head device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thin-film magnetic head device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1760409