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:
Aug. 02, 2011
Filed:
Apr. 27, 2007
Masafumi Mochizuki, Kanagawa-ken, JP;
Shuji Nishida, Kanagawa, JP;
Kimitoshi Etoh, Kanagawa, JP;
Isao Nunokawa, Kanagawa, JP;
Masafumi Mochizuki, Kanagawa-ken, JP;
Shuji Nishida, Kanagawa, JP;
Kimitoshi Etoh, Kanagawa, JP;
Isao Nunokawa, Kanagawa, JP;
Hitachi Global Storage Technologies Netherland BV, Amsterdam, NL;
Abstract
Embodiments in accordance with the present invention provide a perpendicular recording magnetic head whose dimensional dependency on the nonuniformity of magnetic field strength and distribution during manufacture is minimized, with narrowed tracks and without attenuation or erasure of adjacent track data while maintaining high magnetic field strength. According to one embodiment, a magnetic material (trailing/side shield) for creating a steep gradient of magnetic field strength is provided at a trailing side of a pole tip of a main magnetic pole piece and in a direction of the track width. The magnetic head is formed so that a gap (side gap length 'gl') between a side shield and a throat height portion of the pole tip progressively decreases with an increasing distance from an air-bearing surface, in a direction of an element height. That is, side gap length 'gl' () at an element height position Pis made smaller than side gap length “gl” () at an air-bearing surface position Pso as to satisfy a relationship of gl()>gl().