Magnetic bubble multilayer arrangement

Claim 2

A magnetic bubble device comprising: a non-magnetic substrate layer, a first magnetic layer joined thereto capable of accommodating magnetic bubbles, a second magnetic layer joined to said first magnetic layer capable of accommodating second magnetic bubbles, magnetic field generating means for generating a steady magnetic field component directed substantially transverse to said layers, first generator means having a first transverse position with respect to said layers for serially generating a plurality of magnetic bubbles at said first position in said first magnetic layer, second generator means having a second transverse position with respect to said layers for serially generating a plurality of magnetic bubbles at said second position in said second magnetic layer, said first and second transverse positions having a predetermined fixed spatial disposition relative to each other, control means for sequentially and selectively controlling cooperation between said first and second generating means for upon momentary cooperation generating superposed magnetic bubbles in said first and second magnetic layers which superposed magnetic bubbles are energetically joined through a magnetic compensation wall, whereby non-cooperation between said first and second generator means produces mutually repelling single magnetic bubbles in any of said magnetic layers which are furthermore repelling towards any superposed magnetic bubble arrangement, said device further comprising transport means for generating a relative displacement between any magnetic bubble generated by said first and second generator means in one case and said first and second positions in another case, whereby said magnetic layers each accommodate at least two magnetic crystalline sublattices having respective first and second complementary magnetizations which are directed substantially in opposition with each other, said device further comprising detector means for selectively detecting single or superposed magnetic bubbles, and magnetic bubble annihilator means having a predetermined third position and operative for serially annihilating any single magnetic bubble or superposed magnetic bubble appearing at said third position.

Claim 3

A magnetic bubble device as claimed in claim 1, wherein said first magnetic layer is joined to said substrate layer by means of an intermediate magnetic layer capable of accommodating magnetic bubbles, third generator means being provided having a third position with respect to said layers for serially and selectively generating a plurality of magnetic bubbles at said third position in said layer.

Claim 4

A magnetic bubble device as claimed in claim 1 wherein a third magnetic layer capable of accommodating magnetic bubbles is joined to said second magnetic layer, fourth generator means being provided having a fourth position with respect to said layers for serially and selectively generating a plurality of magnetic bubbles at said fourth position in said fourth magnetic layer.

Claim 5

A magnetic bubble device as claimed in claim 1 where in non-superposed magnetic bubbles in different magnetic layers are separated by a potential barrier.

Claim 6

A magnetic bubble device as claimed in claim 1, where in said layers are fused to each other by epitaxial growth.

Claim 7

A magnetic bubble device as claimed in claim 1, wherein superposed magnetic bubbles in adjacent magnetic layers are joined by a magnetic compensation wall.

Claim 8

A magnetic bubble device as claimed in claim 1, wherein said magnetic bubble annihilator means is adapted for locally applying a heat pulse to at least one of said magnetic layers.

Claim 9

A magnetic bubble device as claimed in claim 1, wherein said first and second generator means are stationary with respect to said magnetic layers and wherein said device further comprises magnetic bubble propagation means.

Claim 10

A magnetic bubble device as claimed in claim 8 wherein said first generator means comprises a locally disposed first generator at a position where said second magnetic layer is locally defective.

Claim 11

A magnetic bubble device as claimed in claim 8 wherein said second generator means comprises a locally disposed second generator at a position where said first magnetic layer is locally defective.

Claim 12

A magnetic bubble:device as claimed in claim 8, wherein said first and second generator means comprise a generator for coincidentally generating a superposed magnetic bubble pair in said first and second magnetic layers, and including a magnetic bubble transport path for transporting magnetic bubbles therealong, and field enhancing means disposed locally along said transport path for enhancing said steady magnetic field then passing therealong a predetermined magnetic bubble of constant disposition within said pair is collapsed.

Claim 13

A magnetic bubble device as claimed in claim 4, wherein said generator means comprise a generator at a position where at least one of said magnetic layers is locally defective.

Claim 14

A magnetic bubble device as claimed in claim 8 wherein magnetic bubble guide means are present in at least one of said magnetic layers for guiding a magnetic bubble in a first magnetic layer differently from a magnetic bubble in a second magnetic layer.

Claim 15

A magnetic bubble device as claimed in claim 13 wherein said bubble guide means include diverging switch means for driving magnetic bubbles in respective magnetic layers along different paths.

Claim 16

A magnetic bubble device as claimed in claim 13 wherein said guide means are adapted for guiding a superposed pair of magnetic bubbles differently from a magnetic bubble in said second magnetic layer.

Claim 17

A magnetic bubble device as claimed in claim 13 wherein said guide means are adapted for guiding a superposed pair of magnetic bubbles differently from a magnetic bubble in said first magnetic layer.

Claim 18

A magnetic bubble device comprising: a non-magnetic substrate layer, a first magnetic layer joined thereto capable of accommodating magnetic bubbles, a second magnetic layer joined to said first magnetic layer capable of accommodating second magnetic bubbles, magnetic field generating means for generating a steady magnetic field component directed substantially transverse to said layers, first generator means having a first transverse position with respect to said layers for serially generating a plurality of magnetic bubbles at said first position in said first magnetic layer, second generator means having a second transverse position with respect to said layers for serially generating a plurality of magnetic bubbles at said second position in said second magnetic layer, said generating means being adapted for generating a closely spaced hexagonal magnetic bubble lattice wherein at each lattice point a magnetic bubble is present in at least one of said magnetic layers, said first and second transverse positions having a predetermined fixed spatial disposition relative to each other, control means for sequentially and selectively controlling cooperation between said first and second generating means for upon momentary cooperation generating superposed magnetic bubbles in said first and second magnetic layers which superposed magnetic bubbles are energetically joined through a magnetic compensation wall, whereby non-coopration between said first and second generator means produces mutually repelling single magnetic bubbles in any of said magnetic layers which are furthermore repelling towards any superposed magnetic bubble arrangement, said device further comprising transport means for generating a relative displacement between any magnetic bubble generated by said first and second generator means in one case and said first and second positions in another case, whereby said magnetic layers each accommodate at least two magnetic crystalline sublattices having respective first and second complementary magnetizations which are directed substantially in opposition with each other, said device further comprising detector means for selectively detecting single or superposed magnetic bubbles, and magnetic bubble annihilator means having a predetermined third position and operative for serially annihilating any single magnetic bubble or superposed magnetic bubble appearing at said third position.

Claim 19

A magnetic bubble device comprising: a non-magnetic substrate layer, a first magnetic layer joined thereto capable of accommodating magnetic bubbles, a second magnetic layer joined to said first magnetic layer capable of accommodating second magnetic bubbles, magnetic field generating means for generating a steady magnetic field component directed substantially transverse to said layers, first generator means having a first transverse position with respect to said layers for serially generating a plurality of magnetic bubbles at said first position in said first magnetic layer, second generator means having a second transverse position with respect to said layers for serially generating a plurality of magnetic bubbles at said second position in said second magnetic layer, said generating means being adapted for generating a closely spaced hexagonal magnetic bubble lattice wherein at each lattice point a magnetic bubble is present in at least one of said magnetic layers, said first and second transverse positions having a predetermined fixed spatial disposition relative to each other, control means for sequentially and selectively controlling cooperation between said first and second generating means for upon momentary cooperation generating superposed magnetic bubbles in said first and second magnetic layers which superposed magnetic bubbles are energetically joined through a magnetic compensation wall, whereby non-coopration between said first and second generator means produces mutually repelling single magnetic bubbles in any of said magnetic layers which are furthermore repelling towards any superposed magnetic bubble arrangement, said device further comprising transport means for generating a relative displacement between any magnetic bubble generated by said first and second generator means in one case and said first and second positions in another case, whereby said magnetic layers each accommodate at least two magnetic crystalline sublattices having respective first and second complementary magnetizations which are directed substantially in opposition with each other, said device further comprising detector means for selectively detecting single or superposed magnetic bubbles, and magnetic bubble annihilator means having a predetermined third position and operative for serially annihilating any single magnetic bubble or superposed magnetic bubble appearing at said third position.

Claim 20

A magnetic bubble device as claimed in claim 17 wherein at each lattice point a magnetic bubble is present in exactly one of said magnetic layers.

Claim 21

A magnetic bubble device as claimed in claim 17, wherein said generator means are adapted for generating a closely spaced hexagonal magnetic bubble lattice in at least one said magnetic layers.

Claim 22

A magnetic bubble device as claimed in claim 19 wherein the lattice constant of said magnetic bubble relative is less than 21/2 times the magnetic bubble diameter.

Claim 23

A magnetic bubble device as claimed in claim 17, wherein said magnetic crystalline sublattices each have specific optical activities, which for each magnetic layer are oppositely directed with respect to each other, and wherein said magnetic layers are doped for producing for each layer at corresponding magnetizations respective different optical activities, and wherein said detector means is adapted for specifically discriminating any one of a predetermined number of Faraday rotation vectors.

Claim 24

A magnetic bubble device as claimed in claim 21 comprising external optical detection means, the Faraday rotation for a pair of superposed magnetic bubbles and for non-superposed magnetic bubbles in each respective one of said magnetic layers having at least three different values, respectively.

Claim 25

A magnetic bubble device as claimed in claim 22, wherein said optical detection means is adapted for simultaneously visualizing a plurality of magnetic bubbles on respective magnetic bubble locations.