Multilayer exchange coupled magnetic poles with approximate zero

Details Multilayer exchange coupled magnetic poles with approximate zero Multilayer exchange coupled magnetic poles with approximate zero

1996-04-15

1998-05-12

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Head

Core

G11B 531

Patent

active

057515280

ABSTRACT:
A low noise inductive magnetic head used for writing and reading magnetic signals onto and from a magnetic recording medium includes two magnetic poles P1, P2 that are formed on a substrate which define a transducing gap therebetween. Each of the poles P1, P2 includes an outer magnetic layer formed remotely from the gap and an inner magnetic layer formed adjacent to the gap. The inner and outer magnetic layers have magnetostrictions (.lambda..sub.s) of approximately equal but opposite values, such that each of the magnetic poles P1, P2 exhibits a net magnetostriction of zero or is biased within a predefined range, regardless of the individual magnetostriction values of its layers.

REFERENCES:
patent: 5157570 (1992-10-01), Shukovsky et al.
patent: 5224002 (1993-06-01), Nakashima et al.
patent: 5590008 (1996-12-01), Tanabe et al.

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