Magnetic transducer head structure with reduced leakage between

Details Magnetic transducer head structure with reduced leakage between Magnetic transducer head structure with reduced leakage between

1988-09-06

1990-09-04

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Head

Plural gaps

G11B 5265

Patent

active

049549219

ABSTRACT:
A magnetic core structure for a "read-write" transducer head of the type known as a "wide-write, narrow-read" head, having at least one magnetic gap, wherein the magnetic pole structure performing one of the transducing functions (e.g. the "write" function) is in effect wider than that performing the other (e.g. the "read") function. At least one such magnetic pole has a laminar structure comprising at least one medial layer or strata and at least one flanking layer or strata which is disposed adjacent to and overlying at least portions of the medial strata, to thereby define an included area of overlap therebetween. The thickness of the medial strata, measured along the length of the gap, is less than that of the magnetic core structure on the opposing side of the gap. At least one non-magnetic isolation member is disposed between the flanking strata and the medial strata, the flanking strata, comprising a magnetic material, being disposed in magnetic communication with the medial strata, to thereby magnetically shunt portions of the medial strata. The included area of overlap between the medial strata and the flanking strata is particularly configured so as to limit the transfer of magnetic flux between the flanking strata and the medial strata across the isolation members at the included area to less than about ten percent of the total magnetic flux in the magnetic circuit.

REFERENCES:
patent: 3353168 (1967-11-01), Poumakis
patent: 4085429 (1978-04-01), Hasegawa

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