Magnetic domain-wall storage and logic

Claim 1

DATA PROCESSING APPARATUS COMPRISING, A STRIP OF MAGNETIC FILM MATERIAL HAVING AN EASY AXIS OF MAGNETIZATION SUBSTANTIALLY TRANSVERSE TO ITS LENGTH, A SOURCE OF ELECTRICAL DATA PULSES IN BINARY FORM, WRITE WINDINGS CONNECTED TO SAID SOURCE AND MAGNETICALLY COUPLED TO ONE END OF SAID STRIP FOR APPLYING THERETO A LOCAL SWITCHING FIELD AT AN ANGLE TO SAID EASY AXIS IN TH E PLATE OF SAID STRIP TO INJECT DOMAIN WALLS THEREIN HAVING A PREDETERMINED SENSE OF ROTATION OF MAGNETIZATION CONTROLLED IN ACCORDANCE WITH THE SENSE OF SAID DATA, MEANS FOR APPLYING LOCAL PROPAGATION FIELDS IN THE PLANE OF SAID STRIP ALONG SAID EASY AXIS IN THE VICINITY OF DOMAIN WALLS TO SHIFT THE POSITION OF SAID WALLS ALONG SAID TAPE THROUGH A PREDETERMINED ZONE, AN ERASE WINDING SPACED ALONG SAID STRIP FROM SAID WRITE WINDING AND ADAPTED WHEN ENERGIZED TO APPLY LOCAL MAGNETIC FIELDS HAVING THE SAME DIRECTION SIMULTANEOUSLY TO TWO ADJACENT DOMAIN WALLS THEREBY BRINGING SAID ADJACENT WALLS TOGETHER FOR ONE DIRECTION OF CURRENT FLOW TO CAUSE ALGEBRAIC SUMMATION OF DOMAIN WALL ROTATION, WHEREBY LIKE WALLS FORM A DOUBLE WALL OF 360* ROTATION AND UNLIKE WALLS ARE RETURNED TO 0* ROTATION AND FOR THE ALTERNATE DIRECTION OF CURRENT FLOW MOVING ADJACENT WALLS APART, AND TIMING MEANS FOR ENERGIZING SAID WRITE WINDINGS SAID PROPAGATION MEANS SAID ERASE WINDING IN A PREDETERMINED SEQUENCE WHEREBY SAID DATA IS STORED AND PROCESSED ALONG SAID STRIP AS THE CONTROLLED SENSE OF ROTATION OF MGNETIZATION WITHIN DOMAIN WALLS WHICH SEPARATE DOMAIN ZONES MAGNETIZED IN ALTERNATE DIRECTIONS ALONG SAID EASY AXIS.