Read sensors of the CPP type having nitrogenated hard bias...

Details Read sensors of the CPP type having nitrogenated hard bias... Read sensors of the CPP type having nitrogenated hard bias...

2007-04-09

2008-10-21

Castro, Angel A (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

Reexamination Certificate

active

07440243

ABSTRACT:
A read sensor of the current-perpendicular-to-the-planes (CPP) type includes a sensor stack structure formed in a central region between first and second shield layers which serve as leads for the read sensor; insulator layers formed in side regions adjacent the central region; seed layer structures formed over the insulator layers in the side regions; and hard bias layers formed over the seed layer structures in the side regions. The hard bias layers are made of a nitrogenated cobalt-based alloy, such as nitrogenated cobalt-platinum (CoPt). Suitable if not exemplary coercivity and squareness properties are exhibited using the nitrogenated cobalt-based alloy. The hard bias layers may be formed by performing an ion beam deposition of cobalt-based materials using a sputtering gas (e.g. xenon) and nitrogen as a reactive gas.

REFERENCES:
patent: 7177121 (2007-02-01), Kojima et al.
patent: 7259941 (2007-08-01), Pinarbasi
patent: 2006/0002041 (2006-01-01), Pinarbasi

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