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:
Apr. 06, 2021
Filed:
Feb. 21, 2019
International Business Machines Corporation, Armonk, NY (US);
Robert G. Biskeborn, Hollister, CA (US);
Calvin S. Lo, Saratoga, CA (US);
Jason Liang, Campbell, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
In one general approach, an apparatus includes a sensor having an active tunnel magnetoresistive region, magnetic shields flanking the active tunnel magnetoresistive region, and gaps between the active tunnel magnetoresistive region and the magnetic shields. The active tunnel magnetoresistive region includes a free layer, a tunnel barrier layer and a reference layer. At least one of the gaps includes a seed layer of a chromium alloy and an electrically conductive layer having a refractory material formed on the seed layer. The seed layer in this configuration is more resistant to corrosion than elemental chromium when used in a magnetic recording head and/or in a structure exposed to even trace amounts of fluorine.