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. 28, 2015
Filed:
Jun. 04, 2014
Oracle International Corporation, Redwood City, CA (US);
Terence Schemmel, Longmont, CO (US);
Kevin McKinstry, Westminster, CO (US);
Oracle International Corporation, Redwood City, CA (US);
Abstract
Systems and methods that serve to limit the generation of stray magnetic fields by moving domain walls of magnetic shields of a magnetic head that would otherwise be received and interpreted as noise at the read sensor of the magnetic head. The utilities disclose use of first and second magnetic 'closure' layers (e.g., soft magnetic layers) disposed about but spaced (i.e., magnetically isolated) from the first and second magnetic shields of the read portion of a magnetic head by first and second respective 'closure' gaps (e.g., provided by any appropriate non-magnetic, high magnetic permeability material(s)). The closure layers create a magnetic environment for the shield edges that more closely resembles the interior of the shield, thereby minimizing or at least reducing the number of unstable edge domains and limiting subsequent domain wall movement.