Dynamic magnetic information storage or retrieval – Head – Core
Reexamination Certificate
2006-05-02
2006-05-02
Evans, Jefferson (Department: 2652)
Dynamic magnetic information storage or retrieval
Head
Core
C360S317000
Reexamination Certificate
active
07038881
ABSTRACT:
The invention provides a magnetic head for perpendicular recording capable of recording with high linear recording density and high track density, and a magnetic disk drive incorporating the same. In order to achieve this, one or more sides of the main pole of the magnetic head for perpendicular recording except for the trailing side are formed in a taper with an appropriate angle against the tip surface of the main pole, and the yoke whose widest principal plane is in parallel to the tip surface is provided on the bottom of the main pole.Thereby, the invention achieves the magnetic head for perpendicular recording that generates a sufficiently high magnetic field, and assumes a sharp gradient of magnetic field on the trailing side. By incorporating this magnetic head, a magnetic disk drive capable of handling high linear recording density can be produced.
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Kenchi Ito, Yoshiaki Kawato, Reiko Arai, Tomohiro Okada, Moriaki Fuyama, Yoshihiro Hamakawa, Masahumi Mochizuki, Yoshitaka Nishida, Takayuki Ichihara and Hisashi Takano, “Current Progress of Single-Pole-Type GMR Head for Perpendicular Recording”, Technical Digests of the Magnetic Recording Conference, Aug. 2001, p. F5.
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Yoshiaki Kawato, Masahumi Mochizuki, Chiseki Haginoya and Kenchi Ito, “Single-Pole-Type GMR Heads for Perpendicular Recording at Ultrahigh Areal Densities”, CA-01, 8th3M InterMag Joint Conference, Session CA, Recording Systems 1: Mostly Perpendicular, Jan. 9, 2001, p. 131.
Ito Kenchi
Kawato Yoshiaki
Mochizuki Masafumi
A. Marquez, Esq. Juan Carlos
Evans Jefferson
Fisher Esq. Stanley P.
Hitachi , Ltd.
Reed Smith LLP
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