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Magnetic Delimiting of Film Memory Bits

IP.com Disclosure Number: IPCOM000090772D
Original Publication Date: 1969-Jul-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Feth, GC: AUTHOR [+3]

Abstract

Magnetic delimiting of magnetic film memory bits is effected by two techniques. Both are applicable to coupled film memories having word and bit lines which are orthogonally disposed.

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Magnetic Delimiting of Film Memory Bits

Magnetic delimiting of magnetic film memory bits is effected by two techniques. Both are applicable to coupled film memories having word and bit lines which are orthogonally disposed.

In the first, delimiting is accomplished by alteration of the anisotropy axis in the interbit region. In A, a portion of a coupled film memory array is shown in which a coupled film 1 sandwiches a bit conductor 2. A plurality of word lines 3 crosses bit lines 2 in orthogonal relationship. To accomplish magnetic delimiting of bits, the array is formed in the usual manner such that coupled film 1 has an easy axis parallel to the direction of the width of conductor 2. By applying currents to both word and bit lines, the magnetization is set in opposite directions in adjacent bits associated with the same bit line.

After writing in the manner described, the array is annealed at a suitable temperature and for a time sufficient to locally create, in the interbit region at X, a different easy axis or anisotropy direction. This is possible since the easy axis depends upon the direction of the magnetization vector M during anneal. By magnetizing adjacent magnetic sites in opposite directions along the easy axis, interbit region X is provided in which the magnetization changes continuously from one direction to the other. In the case of a Neel wall, the magnetization rotates in the plane of the film as in B. In thicker films, drawing C, where Bloch walls are present, the magnetization rotates in a plane perpendicular to the plane of the film. In interbit region X, the magne...