Process to manufacture a top spin valve

Details Process to manufacture a top spin valve Process to manufacture a top spin valve

2005-04-26

2005-04-26

Davis, David (Department: 2652)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

C029S603100

Reexamination Certificate

active

06885527

ABSTRACT:
Currently, the shield-to-shield separation of a spin valve head cannot be below about 800 Å, mainly due to sensor-to-lead shorting problems. This problem has now been overcome by inserting a high permeability, high resistivity, thin film shield on the top or bottom (or both) sides of the spin valve sensor. A permeability greater than about 500 is required together with a resistivity about 5 times greater than that of the free layer and an MrT value for the thin film shield that is 4 times greater than that of the free layer. Five embodiments of the invention are described.

REFERENCES:
patent: 5528440 (1996-06-01), Fontana et al.
patent: 5668688 (1997-09-01), Dykes et al.
patent: 5705973 (1998-01-01), Yuan et al.
patent: 6185078 (2001-02-01), Lin et al.

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