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Magnetic Shift Register

IP.com Disclosure Number: IPCOM000075884D
Original Publication Date: 1971-Dec-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Fresia, JF: AUTHOR

Abstract

This register, having magnetic film elements 10, 12, 14 and 16, employes a stray field writing process. First magnetic element 10 has a drive coil or line 18 for applying a magnetic field to element 10 in a direction perpendicular to the easy axis of element 10, i.e., in the hard direction, and a data coil or line 20 for applying a magnetic field to element 10 along its easy axis in a direction dependent upon whether a 1 or a 0 is to be stored in element 10.

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Magnetic Shift Register

This register, having magnetic film elements 10, 12, 14 and 16, employes a stray field writing process. First magnetic element 10 has a drive coil or line 18 for applying a magnetic field to element 10 in a direction perpendicular to the easy axis of element 10, i.e., in the hard direction, and a data coil or line 20 for applying a magnetic field to element 10 along its easy axis in a direction dependent upon whether a 1 or a 0 is to be stored in element 10.

Information is written into first element 10 by supplying coincident currents to lines 18 and 20. This information is then transferred to second element 12 by applying from drive line 22, a hard axis field to element 12 and allowing the magnetostatic or stray field from first element 10 to control the direction of magnetization of second element 12. In a similar manner, the information stored in second element 12 is transferred to third element 14 by energizing drive line 24, and then the information is transferred to fourth element 16 by energizing drive line 26. At the time that the information is being transferred to fourth element 16, new information may be written into first element 10. Drive line 22 may also be energized at this time to erase information stored in second element
12. Although only four magnetic elements are shown, any desired number of elements may be used in the shift register. By employing suitable magnetic element geometries, such that the stray field due to sh...