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Multilayered Magnetic Film Memory

IP.com Disclosure Number: IPCOM000075438D
Original Publication Date: 1971-Sep-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Fresia, JF: AUTHOR

Abstract

A memory employing pairs of magnetic films in a positive coupling or intrinsic parallel coupling relationship, as described in IBM Technical Disclosure Bulletin, Vol. 13, No. 7, December 1970, pp. 2110 and 2111, by H. J. Kump et al, has a bottom film having a relatively high coercivity and a top film having a lower coercivity, separated by a thin interlayer made of, for example, copper. The bottom film may be made of NiFeCo and the top film of NiFe.

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Multilayered Magnetic Film Memory

A memory employing pairs of magnetic films in a positive coupling or intrinsic parallel coupling relationship, as described in IBM Technical Disclosure Bulletin, Vol. 13, No. 7, December 1970, pp. 2110 and 2111, by H. J. Kump et al, has a bottom film having a relatively high coercivity and a top film having a lower coercivity, separated by a thin interlayer made of, for example, copper. The bottom film may be made of NiFeCo and the top film of NiFe.

A reliable memory in which the desired high coercivity is maintained is provided by utilizing a grooved relatively thick copper interlayer 10 between NiFeCo layer 12 and NiFe layer 14, as indicated in Fig. 1. The grooves may extend along the hard or easy axis of the films 12, 14 or they may be in a cross- hatch form to provide intimate contact between magnetic layers 12 and 14. The cross-sectional dimensions of the grooves may take various forms, e.g., rectangular, as indicated in Fig. 1 or triangular, as indicated in Fig. 2. With brief experimentation, the optimum wavelengths and depth of grooves can be achieved for any particular memory requirement.

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