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:
Oct. 14, 2014
Filed:
May. 30, 2013
Perpendicular magnetic recording write head with main pole formed on a metallic amorphous underlayer
Hgst Netherlands B.v., Amsterdam, NL;
Hieu Lam, Milpitas, CA (US);
Stefan Maat, San Jose, CA (US);
Ning Shi, San Jose, CA (US);
Alexander M. Zeltser, San Jose, CA (US);
HGST Netherlands B.V., Amsterdam, NL;
Abstract
A perpendicular magnetic recording write head has a main pole that is typically CoFe electroplated into a generally trapezoidal shaped alumina trench. A metallic side gap layer is deposited into the alumina trench to adjust the trench width to the desired main pole dimension. A nonmagnetic metallic amorphous underlayer, preferably an amorphous NiTa alloy or an amorphous NiNb alloy, is then deposited on the side gap layer. A pole seed layer, such as a NiCr/CoFe bilayer, is deposited into the trench onto the metallic amorphous underlayer prior to electroplating the CoFe main pole. The metallic amorphous underlayer serves to reset the growth between the side gap layer and the NiCr/CoFe pole seed layer. The metallic amorphous underlayer does not insulate the electroplating CoFe layer from the metallic side gap layer, which allows for better current conduction normal to the layers, resulting in a main pole with improved magnetic properties.