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:
Sep. 01, 2020
Filed:
Jan. 30, 2018
Western Digital Technologies, Inc., San Jose, CA (US);
Suping Song, Fremont, CA (US);
Zhanjie Li, Pleasanton, CA (US);
Yaguang Wei, Pleasanton, CA (US);
Terence Tin-Lok Lam, Cupertino, CA (US);
Kuok San Ho, Emerald Hills, CA (US);
Western Digital Technologies, Inc., San Jose, CA (US);
Abstract
A perpendicular magnetic recording write head includes a main portion formed of conventional high-moment magnetic materials, and a beveled or tapered trailing portion formed of a Co/Fe multilayer with negative magnetic anisotropy (negative anisotropy constant or —K). The Co/Fe multilayer tapered trailing portion has a high saturation magnetization (M) and thus functions as part of the write pole to direct the flux perpendicularly to the recording layer. Also, the —KCo/Fe multilayer tapered trailing portion has its hard axis oriented substantially orthogonal to the layer thickness and thus substantially prevents flux leakage into the write gap. The —KCo/Fe multilayer may also be formed on the sides of the write pole in the cross-track direction to prevent flux leakage into the side gaps.