Magnetically stable shields for MR head

Details Magnetically stable shields for MR head Magnetically stable shields for MR head

1994-12-30

1996-05-07

Wolff, John H.

Dynamic magnetic information storage or retrieval

Head

Hall effect

360126, G11B 5127

Patent

active

055152210

ABSTRACT:
First and second shield layers of a read head are constructed of a lamination of NiMn and Fe-based layers to improve the performance of the shield layers when they are subjected to high external fields, such as from the pole tips of a write head combined therewith. Without lamination with one or more NiMn layers, many shield materials do not return to the same domain configuration after excitation from an external field. The result is that the Fe-based material assumes a different domain configuration after each excitation which changes the bias point of the MR sensor of the read head. By laminating with NiMn, the uniaxial anisotropy of the material can be increased to provide uniform domain configuration and exchange pinning between shield material NiMn returns the material to the same configuration after each external field excitation. The invention further provides fine tunings of the magnetic properties of the shield layer by various combinations of the Fe-based layers and/or the NiMn layer with NiFe layers.

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