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US4415990A
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Complementary bi-level magnetic bubble propagation circuit
Assignee: Boeing North American Inc
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Filing: 1981-06-22
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Granted: 1983-11-15
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Expires: 2001-06-22
Abstract
Abstract A bi-level magnetic bubble domain propagation structure in which the domain guide structure is formed by a spatially periodic pattern of permalloy implemented on two discrete levels separated by a substantially vertical gap. The structure forms a pattern of contiguous disk on one level and the complementary image of such disks on the second level.
Inventors
- 👤 Isoris S. Gergis
- 👤 Wai-Tak P. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:50
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/32; H01F41/34; G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0808; G11C19/0816
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
234 words
A magnetic bubble domain device comprising: a planar layer of magnetic material in which magnetic bubble domains can be propagated; a bubble domain guide structure coupled to said layer for defining a bubble propagation path for guiding the movement of said bubbles in said layer in response to a cyclical change in the orientation of a reorienting magnetic field within the plane of said layer; said structure comprising a two-level composite structure including a first pattern of elements responsive to a magnetic field formed as an upper first layer of said structure, and a second pattern of elements responsive to a magnetic field forming a lower second layer of said structure, said first and said second patterns being complementary to each other, said first and second layers being separated by a substantially vertical gap; said first and second second pattern of elements being operative in response to a rotating field so as to form a potential energy well in said layer of magnetic material in which magnetic bubble domains can be propagated underneath said layers of said guide structure so that as the magnetic field reorients in the plane of the layer, the potential well is translated in said layer of magnetic material in a direction along a path corresponding to the path in the plane of said guide structure of the vertical gap between said upper first layer and said lower second layer.
Claim 2
Dependent Claim
234 words
A magnetic bubble domain device comprising: a planar layer of magnetic material in which magnetic bubble domains can be propagated; a bubble domain guide structure coupled to said layer for defining a bubble propagation path for guiding the movement of said bubbles in said layer in response to a cyclical change in the orientation of a reorienting magnetic field within the plane of said layer; said structure comprising a two-level composite structure including a first pattern of elements responsive to a magnetic field formed as an upper first layer of said structure, and a second pattern of elements responsive to a magnetic field forming a lower second layer of said structure, said first and said second patterns being complementary to each other, said first and second layers being separated by a substantially vertical gap; said first and second second pattern of elements being operative in response to a rotating field so as to form a potential energy well in said layer of magnetic material in which magnetic bubble domains can be propagated underneath said layers of said guide structure so that as the magnetic field reorients in the plane of the layer, the potential well is translated in said layer of magnetic material in a direction along a path corresponding to the path in the plane of said guide structure of the vertical gap between said upper first layer and said lower second layer.
Claim 3
Dependent Claim
50 words
A device as defined in claim 1 wherein said bubble domains are propagated underneath said upper layer during a first portion of the timing cycle of the reorienting magnetic field, and propagated underneath said lower layer during a second subsequent portion of the timing cycle of the reorienting magnetic field.
Claim 4
Dependent Claim
18 words
A device as defined in claim 1, wherein said first and second layer of magnetic material comprises permalloy.
Claim 5
Dependent Claim
19 words
A device as defined in claim 1, wherein said guide structure is formed as a continuous, spatially periodic structure.
Claim 6
Dependent Claim
18 words
A device as defined in claim 1, wherein said second pattern is a sequence of overlapping contiguous disks.
Claim 7
Dependent Claim
19 words
A device as defined in claim 5, wherein the center of said disks lie along a substantially straight line.
Claim 8
Dependent Claim
15 words
A device as defined in claim 5, wherein said disks are approximately the same radius.
Claim 9
Dependent Claim
27 words
A device as defined in claim 7, wherein said disks overlap by a distance equal to less than R/4, wherein R is the radius of said disks.
Claim 10
Dependent Claim
18 words
A device as defined in claim 1, wherein said substantially vertical gap is filled with a dielectric material.
Claim 11
Dependent Claim
14 words
A device as defined in claim 9, wherein said dielectric material is silicon dioxide.
Claim 12
Dependent Claim
23 words
A device as defined in claim 1, wherein said second pattern is a substantially linear strip having concave trapezoidal indentations along the edges.
Claim 13
Dependent Claim
41 words
A device as defined in claim 11, wherein the trapezoidal indentation extends from the edge of said linear strip in a normal direction towards the center of the strip a distance equal to approximately 1/3 of the width of the strip.
Claim 14
Dependent Claim
16 words
A device as defined in claim 11, wherein said trapezoidal indentations are approximately the same size.
Claim 15
Dependent Claim
25 words
A device as defined in claim 11 wherein the distance between the trapezoidal indentations is greater than the length of the base of the trapezoid.
Claim 16
Dependent Claim
26 words
A device as defined in claim 14 wherein the distance between the trapezoidal indentations is approximately three times as large as the base of the trapezoid.
Claim 17
Dependent Claim
221 words
A magnetic bubble domain device comprising: a planar layer of magnetic material in which magnetic bubble domains can be propagated; a bubble domain guide structure disposed on one side of said layer and coupled to said layer for defining a bubble propagation path for guiding the movement of said bubbles in said layer in response to a cyclical change in the orientation of a reorienting magnetic field within the plane of said layer; said structure comprising a two-level composite structure including a first pattern of elements responsive to a magnetic field formed as an upper first layer of said structure, and a second pattern of elements responsive to a magnetic field forming a lower second layer of said structure, said first and said second patterns being complementary to each other, said first and second layers being separated by a substantially vertical gap; said first and second pattern of elements being operative in response to a rotating field so as to form a potential energy well in said layer of magnetic material in which magnetic bubble domains can be propagated underneath said layers of said guide structure so that as the magnetic field reorients in the plane of the layer the potential well is translated in said layer of magnetic material alternately underneath said upper first layer and said lower second layer.
Claim 18
Dependent Claim
221 words
A magnetic bubble domain device comprising: a planar layer of magnetic material in which magnetic bubble domains can be propagated; a bubble domain guide structure disposed on one side of said layer and coupled to said layer for defining a bubble propagation path for guiding the movement of said bubbles in said layer in response to a cyclical change in the orientation of a reorienting magnetic field within the plane of said layer; said structure comprising a two-level composite structure including a first pattern of elements responsive to a magnetic field formed as an upper first layer of said structure, and a second pattern of elements responsive to a magnetic field forming a lower second layer of said structure, said first and said second patterns being complementary to each other, said first and second layers being separated by a substantially vertical gap; said first and second pattern of elements being operative in response to a rotating field so as to form a potential energy well in said layer of magnetic material in which magnetic bubble domains can be propagated underneath said layers of said guide structure so that as the magnetic field reorients in the plane of the layer the potential well is translated in said layer of magnetic material alternately underneath said upper first layer and said lower second layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-14 | 1987-05-16 | 1987-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-14 | 1991-05-16 | 1991-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-14 | 1995-05-16 | 1995-11-15 | $7700.00 | Window Closed / Lapsed |