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:
Jul. 27, 1999
Filed:
Jun. 18, 1996
Takeshi Obata, Tokyo, JP;
Kazuhiro Baba, Tokyo, JP;
NEC Corporation, , JP;
Abstract
A magnetic head for recording and reproducing a signal on and from a magnetic recording medium, comprises a slider, a magnetic resistance element supported by the slider, and a protective film provided on a sliding surface of the slider and a surface of the magnetic resistance element facing the magnetic recording medium. The protective film has an intermediate layer formed of at least one element selected from the group consisting of hard carbon, boron, titanium and aluminium, and carbides, nitrides and oxides of silicon, boron, titanium, or aluminum, and an amorphous hard carbon film formed on the intermediate layer. The protective film is 100 .ANG. or less in thickness and the slider is formed of composite ceramic material of Al.sub.2 O.sub.3 and TiC. The intermediate layer is formed by either one of a magnetron sputtering method, a direct current two electrode sputtering method, a high frequency (rf) sputtering method, and an ion beam sputtering method. The amorphous hard carbon film is formed by a rf plasma CVD method. In the protective film thus obtained, the amorphous hard carbon film contains hydrogen of 10 to 30 atomic % and the protective film is 8000 to 10000 kg/mm.sup.2 in Vickers hardness. The magnetic head has a friction coefficient of 0.1 or less between the magnetic head and the magnetic recording medium after 20000 CSS cycles.