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:
Dec. 31, 2019
Filed:
Aug. 24, 2018
Headway Technologies, Inc., Milpitas, CA (US);
Ying Liu, San Jose, CA (US);
Yue Liu, Fremont, CA (US);
Kei Hirata, Sunnyvale, CA (US);
Yuhui Tang, Milpitas, CA (US);
Headway Technologies, Inc., Milpitas, CA (US);
Abstract
A PMR writer is disclosed with an all wrap around (AWA) shield design in which one or more of the leading shield, lead edge taper (LET), and side shields are comprised of a low moment high damping (LMHD) magnetic material having a damping constant ≥0.04 and a magnetic flux density (Bs) from 1 kilogauss (kG) to 8 kG. The LMHD magnetic material may be FeNiM, FeCoM, FeNM, or FeCoNiM where M is a 3d, 4d, or 5d transition metal. The LET layer has a tapered side adjoining the leading gap and with a thickness that decreases to zero at height hof 50 nm to 500 nm from the air bearing surface. The leading shield also has a backside at h. Wide adjacent track erasure is minimized while area density capability is enhanced compared with conventional shields with Bs from 10-19 kG.