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Coincident Current Magnetic Domain Switching

IP.com Disclosure Number: IPCOM000077591D
Original Publication Date: 1972-Aug-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Liebschutz, LC: AUTHOR

Abstract

T-bars 10, 11 and 12 and I-bar 13 constitute a portion of a magnetic overlay pattern embodying a transfer circuit on a domain sheet magnetic material 14, which is superposed on a substrate of insulating material 15. Conductors 16 and 17 are superposed on the magnetic overlay patterns as shown. Conductors 16 and 17 are electrically insulated from each other by an insulating layer 18 and by suitable means from the magnetic overlay. An in-plane orientation rotating magnetic field H is applied to the sheet material 14 in a well-known manner in the presence of a biasing field H(z). Domains propagated from site 1 of T-bar 12 along the overlay can be switched from position 4 of T-bar 11 to position 1' or to position 1'' of T-bar 12, by the application of domain control current to conductors 16 and 17.

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Coincident Current Magnetic Domain Switching

T-bars 10, 11 and 12 and I-bar 13 constitute a portion of a magnetic overlay pattern embodying a transfer circuit on a domain sheet magnetic material 14, which is superposed on a substrate of insulating material 15. Conductors 16 and 17 are superposed on the magnetic overlay patterns as shown. Conductors 16 and 17 are electrically insulated from each other by an insulating layer 18 and by suitable means from the magnetic overlay. An in-plane orientation rotating magnetic field H is applied to the sheet material 14 in a well-known manner in the presence of a biasing field H(z). Domains propagated from site 1 of T-bar 12 along the overlay can be switched from position 4 of T-bar 11 to position 1' or to position 1'' of T-bar 12, by the application of domain control current to conductors 16 and 17. Greater control is obtained if the switching currents in the conductors 16 and 17 individually are equal to one-half the current (1/2) required to divert the domain to position 1' or 1''.

The following table shows a current code combination for effecting the switching of propagating domains from position 4: Conductor 16 Conductor 17 Sum Bubble Switches 1 +1/2 +1/2 +I 1" 2 +1/2 -1/2 0 1' 3 -1/2 +1/2 0 1' 4 -1/2 -1/2 -I 1'.

With this arrangement a single-pole, double-throw (SPDT) switch action is provided having ready application to data processing codes, which readily adapts to magnetic domain storage technology and to data proce...