Thin film perpendicular magnetic recording head, their...

Details Thin film perpendicular magnetic recording head, their... Thin film perpendicular magnetic recording head, their...

2008-10-21

2010-10-12

Klimowicz, William J (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Core

C360S125120, C360S125040

Reexamination Certificate

active

07813079

ABSTRACT:
Thin film perpendicular magnetic head with a narrow main pole capable of a high recording density in excess of 100 gigabits per square inch and generating a high magnetic recording field, while also being modified to suppress remanent magnetic fields occurring immediately after writing operation. A return path is provided for supplying a magnetic flux to the main pole, and an conductive coil for excitation of the main pole and return path. The main pole has a pole width of 200 nanometers or less, and a magnetic multilayer made up of a high saturation flux density layer and low saturation flux density layer. The low saturation flux density layer and the high saturation flux density suppress remanent magnetization and prevent erasing after writing by utilizing a closed magnetic domain structure in the pole.

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