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Magnetic Inversion Circuit

IP.com Disclosure Number: IPCOM000097054D
Original Publication Date: 1962-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Ghisler, W: AUTHOR [+2]

Abstract

This is an inversion circuit comprising a plurality of thin film magnetic cells 1...10 exhibiting circular-uniaxial anisotropy. They are arranged in a contiguous row so as to support domain wall propagation.

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Magnetic Inversion Circuit

This is an inversion circuit comprising a plurality of thin film magnetic cells
1...10 exhibiting circular-uniaxial anisotropy. They are arranged in a contiguous row so as to support domain wall propagation.

Conductors A, B and the conductor pairs C and C' are selectively threaded through the cells 1...10 on a group basis. When conductors A, B, C and C' are pulsed in accordance with the three-clock pulse program, domain walls representative of binary information are propagated from right to left along adjacent cells. Positive shift pulses 12 and negative shift pulses 14 produce driving fields less than the nucleation field strength H(N) but larger than the critical field strength H(C) for domain wall motion. Negative reset pulses 16, applied along conductors B, C and C', produce resetting fields at least greater than the critical field strength H(C). Negative reset pulses 18 applied along conductor A, however, produce resetting fields at least greater than the nucleation field strength H(N).

Inversion cell 4 and cell 5 have similarly aligned magnetizations, i. e., counter-clockwise. Thus, each reset pulse 18 along conductor A is effective to establish a domain wall 20 therebetween. The inversion function is effected by propagating domain wall 20 along cells 6...10, etc. Such is effected unless cancelled due to a domain wall having been previously propagated along cells
1...4 and established between cell 4 and inversion cell 5. Shift pul...