Multilevel domain propagation arrangement

Claim 2

A domain propagation arrangement comprising a sheet of magnetic material in which single wall domains can be moved, n > 1 rails energy coupled to and defining a propagation channel in said sheet, means for generating repetitive magnetic field patterns for moving domains from stage to stage simultaneously along a first or second side of each of said rails from input to output stages in said channels, said rails having a geometry and being disposed to define n + 2 stable positions for domains in each of said stages.

Claim 3

A domain propagation arrangement in accordance with claim 1 including means for moving a domain to a selected one of said n+2 positions in said input stage and means for detecting the one of said n+2 positions occupied by a domain at said output stage.

Claim 4

A domain propagation arrangement in accordance with claim 1 wherein said rails comprise magnetically soft films disposed in parallel between said input and output stages.

Claim 5

An arrangement in accordance with claim 1 wherein said rails comprise grooves in the surface of said sheet disposed in parallel between said input and output stages.

Claim 6

An arrangement in accordance with claim 2 wherein each of said rails forms a closed loop for recirculating information.

Claim 7

An arrangement in accordance with claim 3 wherein n is 2.

Claim 8

An arrangement in accordance with claim 6 wherein said two rails are spaced apart a distance such that a domain therebetween in a stable pOsition with respect to a first of said rails overlies the second of said rails such that the latter applies only a negligible force on said domain.

Claim 9

An arrangement in accordance with claim 7 wherein said domain has a diameter of 2R and the distance between the centers of said rails is R.

Claim 10

A multilevel magnetic domain logic arrangement comprising a sheet of magnetic material in which single wall domains can be moved, a plurality of magnetically soft overlay rails juxtaposed with a surface of said sheet, means for generating a repetitive magnetic field pattern along said rails in a manner to move domains from stage to stage therealong between input and output stages, each of said rails having a geometry for defining first and second laterally disposed stable positions for a domain in each of said stages, said rails being disposed with respect to one another in a manner to define a set of laterally displaced stable positions for a domain in each of said stages, means for moving domains to a selected one of said set of positions defined by said plurality of rails at said input stage, and means for detecting the presence and absence of domains in ones of said set of positions at said output stage.

Claim 11

A multilevel magnetic domain logic arrangement comprising a sheet of magnetic material in which single wall domains can be moved, a plurality of magnetically soft overlay rails juxtaposed with a surface of said sheet, means for generating a repetitive magnetic field pattern along said rails in a manner to move domains from stage to stage therealong between input and output stages, each of said rails having a geometry for defining first and second laterally disposed stable positions for a domain in each of said stages, said rails being disposed with respect to one another in a manner to define a set of laterally displaced stable positions for a domain in each of said stages, means for moving domains to a selected one of said set of positions defined by said plurality of rails at said input stage, and means for detecting the presence and absence of domains in ones of said set of positions at said output stage.