The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 09, 1988
Filed:
Oct. 29, 1984
Kazuo Shiiki, Tsukui, JP;
Noriyuki Kumasaka, Ohme, JP;
Yoshihiro Shiroishi, Hachioji, JP;
Hitoshi Nakamura, Ohme, JP;
Yoshihiro Hamakawa, Kokubunji, JP;
Noritoshi Saito, Hachioji, JP;
Shigeo Aoki, Katsuta, JP;
Kiminari Shinagawa, Chiba, JP;
Mitsuhiro Kudo, Nishitama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A ferromagnetic material is composed of an iron alloy which contains 2 to 12% by weight of silicon and 5 to 25% by weight of at least one element selected from the group consisting of ruthenium, rhodium, palladium, iridium, platinum, gold and silver. This ferromagnetic material exhibits a high saturation flux density and good corrosion resistance. Excellent magnetic characteristics are obtained by a multilayered film which is obtained by alternatingly laminating the above ferromagnetic material and a spacer layer composed of other material. Further, a markedly increased recording density is exhibited by a magnetic head for perpendicular magnetic recording, when the end of the main pole is composed of the ferromagnetic material.