Perpendicular magnetic recording head with a laminated pole

Details Perpendicular magnetic recording head with a laminated pole Perpendicular magnetic recording head with a laminated pole

2007-07-19

2011-11-15

Negron, Daniell L (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Core

C360S125080

Reexamination Certificate

active

08059366

ABSTRACT:
A laminated write pole layer for a PMR write head is disclosed in which a plurality of “n” magnetic layers and “n−1” non-magnetic spacers are formed in an alternating fashion on a substrate. The non-magnetic spacers promote exchange decoupling or antiferromagnetic coupling between adjacent magnetic layers. Writability is improved when the trailing magnetic layer has a thickness greater than the thickness of other magnetic layers and preferably >25% of the total thickness of the magnetic layers. The thicknesses of the other magnetic layers may be equal or may become progressively smaller with increasing distance from the trailing magnetic layer. In another embodiment, the non-magnetic spacer between the trailing magnetic layer and the nearest magnetic layer is replaced by a magnetic spacer made of a soft magnetic material to promote magnetic coupling and effectively increase the thickness of the trailing magnetic layer.

REFERENCES:
patent: 5379172 (1995-01-01), Liao
patent: 6233116 (2001-05-01), Chen et al.
patent: 6243939 (2001-06-01), Chen et al.
patent: 6950277 (2005-09-01), Nguy et al.
patent: 7057853 (2006-06-01), Okada et al.
patent: 7120988 (2006-10-01), Le et al.
patent: 2003/0133223 (2003-07-01), Minor
patent: 2004/0004786 (2004-01-01), Shukh et al.
patent: 2004/0120074 (2004-06-01), Okada et al.
patent: 2006/0044680 (2006-03-01), Liu et al.
patent: 2006/0098334 (2006-05-01), Jayasekara et al.
patent: 2006/0232882 (2006-10-01), Lee et al.
Co-pending U.S. Appl. No. 11/825,034, filed Jul. 3, 2007, “A Laminated Film for Head Applications”, assigned to the same assignee as the present invention.
Co-pending U.S. Appl. No. 11/820,962, filed Jun. 21, 2007, “PMR with Improved Writability and Process Controllability by Double Layer Patterning”, assigned to the same assignee as the present invention.
High Moment Materials and Fabrication Processes for Shielded Perpendicular Write Head Beyond 200 Gb/in2, by Y. Chen et al., IEEE Trans. on Mag., vol. 43, No. 2, Feb. 2007, pp. 609-614.
“Magnetic Properties of FeCo Multilayered Films for Single Pole Heads”, by Yasuyuki Okada et al., IEEE Trans. on Mag., vol. 40, No. 4, Jul. 2004, pp. 2368-2370.
“Micromagnetics of Laminated Permalloy Films”, by John C. Slonczewski et al., IEEE Trans. on Mag., vol. 24, No. 3, May 1988, pp. 2045-2054.

Affiliated with

Also associated with

Rating

Perpendicular magnetic recording head with a laminated pole does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Perpendicular magnetic recording head with a laminated pole, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Perpendicular magnetic recording head with a laminated pole will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4274132