Browse Prior Art Database

Magnetic Film Memory

IP.com Disclosure Number: IPCOM000090093D
Original Publication Date: 1969-Jan-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Paton, A: AUTHOR

Abstract

A magnetic film memory comprises an n + 1 x N array 10 of anisotropic magnetic film elements. N word lines 11 each extend along a respective column of magnetic film elements of the array 10 and n bit lines 12 each extend along a respective row of magnetic film elements. A phase line 13 of identical construction, but of different function to the bit lines 12, extends along the remaining row of elements in array 10.

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Magnetic Film Memory

A magnetic film memory comprises an n + 1 x N array 10 of anisotropic magnetic film elements. N word lines 11 each extend along a respective column of magnetic film elements of the array 10 and n bit lines 12 each extend along a respective row of magnetic film elements. A phase line 13 of identical construction, but of different function to the bit lines 12, extends along the remaining row of elements in array 10.

Each element is positioned at the intersection of a word line with a bit line or phase line and has its easy axis of magnetization extending substantially parallel to the word line. Thus current along a word line is effective to produce a magnetic field in the hard axis direction of the elements and current along any one of the bit lines or the phase line is effective to apply a magnetic field in the easy axis direction of the elements. All the magnetic film elements on the phase line are magnetized in the same direction along the easy axis, in this case representing binary zero.

To interrogate the store, an oscillatory signal of frequency f is applied to a selected one of word lines 11 by word driver circuit 14. This produces oscillatory signals of frequency 2f in each bit line 12 and phase line 13. The phase of the signal developed on each line is characteristic of the information stored in the magnetic film element at the intersection of that line with the selected word line.

Bit lines 12 are each connected to supply one input to...