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Intrinsic Antiparallel Coupled NDRO Device

IP.com Disclosure Number: IPCOM000091241D
Original Publication Date: 1967-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Kump, HJ: AUTHOR [+2]

Abstract

This is a form of magnetic coupling between hard, high anisotropy field, and soft, low anisotropy field, coupled magnetic thin films separated by an interlayer of from about 1300 to 8000 angstroms thickness. This coupling is referred to as intrinsic antiparallel coupling. Devices having excellent nondestructive readout NDRO properties utilize this coupling.

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Intrinsic Antiparallel Coupled NDRO Device

This is a form of magnetic coupling between hard, high anisotropy field, and soft, low anisotropy field, coupled magnetic thin films separated by an interlayer of from about 1300 to 8000 angstroms thickness. This coupling is referred to as intrinsic antiparallel coupling. Devices having excellent nondestructive readout NDRO properties utilize this coupling.

Such devices provide for suppressing the conventional magnetostatic demagnetizing fields caused by edge effects when rotated into the hard direction. One form of such a device for utilizing intrinsic antiparallel coupling is shown. The device has a conducting ground plane 10, a first pair 11 of coupled hard film 12 and soft film 13 separated by an SiO interlayer 14 of 2000 angstroms thickness, a word line 15, and a second pair 16 of coupled hard film 17 and soft film 18, also separated by an SiO interlayer 19 of 2000 angstroms thickness, and a bit-sense line 20. The latter is orthogonal to the easy directions of the coupled films as indicated by the arrows. The two pairs 11 and 16 are separated by about 3 microns. The anisotropy field ratio of the hard and soft films is about 3:1. The hard films have an anisotropy field of about 9 oersteds. The soft films have an anisotropy field of about 3 oersteds.

In a second form, one pair of coupled films, e.g., the pair 16, can be replaced by a single permalloy layer of high anisotropy. Such layer is disposed with its easy axis...