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Analog Storage in Thin Magnetic Films

IP.com Disclosure Number: IPCOM000096032D
Original Publication Date: 1964-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 3 page(s) / 43K

Publishing Venue

IBM

Related People

Kump, HJ: AUTHOR [+2]

Abstract

This is an analog storage matrix which employs high dispersion thin magnetic film memory elements and is provided with a nondestructive readout feature.

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Analog Storage in Thin Magnetic Films

This is an analog storage matrix which employs high dispersion thin magnetic film memory elements and is provided with a nondestructive readout feature.

Anisotropic thin magnetic films exhibit 0 degree and 180 degree easy (stable) directions of magnetization and 90 degrees and 270 degree hard (unstable) directions of magnetization. The distinguishing feature of such films is the fact that, while an applied field causes such a film to orient in one of its hard directions, the removal of the field sees the film returning to one of its preferred easy directions. In such films, the dipole arrangements are said to be aligned along the easy axis. On the other hand, when there is a significant angular nonalignment of the dipoles, the film is described as a dispersive film.

Dispersive magnetic films not only exhibit stable states of magnetization in their easy direction, but also are stable in the hard direction. Moreover, when such a dispersive film is oriented in the hard direction, it responds to applied switching fields which tend to switch the magnetic orientation of the film back to the easy direction. Such response produces an output which is directly proportional to the strength of the switching field. Using this phenomenon, an analog storage device can be realized.

At A, there is a representative cross section of an analog storage matrix. Dispersive thin film magnetic elements 10 and 12 are of the type above described and exhibit hard and easy axes as shown by arrows 14 and 16, respectively. The application of a word drive pulse from word driver 18 through Or 19 to word line 20 acts to stably orient films 10 and 12 in their hard direction
14. Coincident with a subsequently applied word drive pulse, the storage of analog information is achieved. Such i...