US3914751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gapless multithickness propagation structure for magnetic domain devices
Assignee: International Business Machines Corp
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Filing: 1973-12-27
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Granted: 1975-10-21
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Expires: 1993-12-27
Abstract
Abstract A gapless, multithickness propagation structure is provided for implementing the continuous movement of magnetic bubble domains under the control of a reorienting in-plane field. Propagation is achieved by providing two parallel rows of H-shaped overlays of soft magnetic material in spaced-apart end-to-end relation adjacent to one surface of a magnetic medium having magnetic bubble domains therein. The ends of the H-shaped overlays in each row are connected to each other and the ends of the H-shaped overlays in the adjacent row by means of a transversely extending overlay strip having a thickness approximately one-half the thickness of the H-shaped overlays. High storage density, with a cell size 8W2 is obtained, where W is the line width of the elements in the structure.
Inventors
- 👤 George E Keefe
- 👤 Yeong S Lin
- 👤 Laurence L Rosier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:07
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0808; G11C19/0816
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
109 words
A gapless, single-sided propagation structure for implementing the continuous movement of magnetic bubble domains in a supporting material in response to a reorienting in-plane magnetic field comprising a plurality of propagation structures of magnetically soft material having at least a T-bar configuration with the cross bars of said T-bar configuration being disposed in spaced-apart aligned relation and a plurality of I-bars of magnetically soft material having one end thereof disposed intermediate and connecting said cross bars with the opposite end thereof extending in the opposite direction from the stem of said T-bar structures, said T-bar structures having a thickness approximately twice as great as the thickness of said I-bars.
Claim 2
Dependent Claim
109 words
A gapless, single-sided propagation structure for implementing the continuous movement of magnetic bubble domains in a supporting material in response to a reorienting in-plane magnetic field comprising a plurality of propagation structures of magnetically soft material having at least a T-bar configuration with the cross bars of said T-bar configuration being disposed in spaced-apart aligned relation and a plurality of I-bars of magnetically soft material having one end thereof disposed intermediate and connecting said cross bars with the opposite end thereof extending in the opposite direction from the stem of said T-bar structures, said T-bar structures having a thickness approximately twice as great as the thickness of said I-bars.
Claim 3
Dependent Claim
159 words
A gapless propagation structure as set forth in claim 1 further comprising a second plurality of propagation structures of magnetically soft material having at least a T-bar configuration with the cross bars of said T-bar structures being disposed in spaced-apart aligned relation parallel to the cross bars of the first mentioned plurality of structures with the stems thereof extending in the opposite direction from the stems of the first plurality of T-bar structures and with the opposite ends of said I-bars disposed between and connected to the cross bars of the second plurality of structures and two additional T-bars of magnetically soft material having the cross bars thereof disposed parallel to said first mentioned I bars and interconnecting the ends of each plurality of structures to define a closed loop path for the continuous movement of magnetic bubble domains said two additional T-bars being of equal thickness with said I-bars and having the stems extending outwardly of said loop.
Claim 4
Dependent Claim
81 words
A structure for moving magnetic bubble domains in a supporting medium, comprising: a magnetic medium in which said bubble domains can move, a propagation structure for moving said domains in said magnetic medium, said propagation structure being comprised of a plurality of adjacent elements which are in contact with one another, said elements being comprised of rectilinear bar segments having different thicknesses capable of providing magnetic poles for shifting said domains in response to an iN-plane magnetic field having ranging orientation.
Claim 5
Dependent Claim
81 words
A structure for moving magnetic bubble domains in a supporting medium, comprising: a magnetic medium in which said bubble domains can move, a propagation structure for moving said domains in said magnetic medium, said propagation structure being comprised of a plurality of adjacent elements which are in contact with one another, said elements being comprised of rectilinear bar segments having different thicknesses capable of providing magnetic poles for shifting said domains in response to an iN-plane magnetic field having ranging orientation.
Claim 6
Dependent Claim
31 words
The structure of claim 3, where said elements are comprised of T-bars and I-bars located between adjacent T-bars and in contact therewith, said I-bars having a different thickness than said T-bars.
Claim 7
Dependent Claim
71 words
The structure of claim 3, where said elements are comprised of a plurality of first H-shaped elements each of which has two side members connected by a crossbar and being disposed with the side members of adjacent H-shaped elements in alignment with one another, there being a plurality of I-bars between adjacent ones of said H-shaped elements and in contact therewith, said I-bars having different thicknesses than said adjacent H-shaped elements.
Claim 8
Dependent Claim
82 words
A structure for moving magnetic bubble domains in a supporting medium comprising: a magnetic medium capable of supporting said domains, a propagation structure for moving said domains in said supporting medium, said propagation structure being comprised of at least one rectilinear bar element in contact with another bar element having a different thickness than said first bar element, there being magnetic poles created along said bar elements in response to the application of a reorienting magnetic field in rectilinear said magnetic medium.
Claim 9
Dependent Claim
82 words
A structure for moving magnetic bubble domains in a supporting medium comprising: a magnetic medium capable of supporting said domains, a propagation structure for moving said domains in said supporting medium, said propagation structure being comprised of at least one rectilinear bar element in contact with another bar element having a different thickness than said first bar element, there being magnetic poles created along said bar elements in response to the application of a reorienting magnetic field in rectilinear said magnetic medium.
Claim 10
Dependent Claim
15 words
The structure of claim 6, where said at least one bar element is a T-bar.
Claim 11
Dependent Claim
95 words
A gapless single sided propagation structure for implementing the continuous movement of magnetic bubble domains in a supporting material in response to a reorienting in-plane magnetic field, comprising a plurality of T-bar propagation structures with the cross bars of said T-bars being disposed and spaced apart in aligned relationship, and a plurality of I-bars having one end thereof disposed intermediate and connecting the crossbars of adjacent T-bars, with the opposite ends thereof extending in the opposite direction from the stem of said T-bars, said T-bars having a different thickness than the thickness of said I-bars.
Claim 12
Dependent Claim
95 words
A gapless single sided propagation structure for implementing the continuous movement of magnetic bubble domains in a supporting material in response to a reorienting in-plane magnetic field, comprising a plurality of T-bar propagation structures with the cross bars of said T-bars being disposed and spaced apart in aligned relationship, and a plurality of I-bars having one end thereof disposed intermediate and connecting the crossbars of adjacent T-bars, with the opposite ends thereof extending in the opposite direction from the stem of said T-bars, said T-bars having a different thickness than the thickness of said I-bars.
Claim 13
Dependent Claim
17 words
The structure of claim 8, where said T-bars and said I-bars form a closed loop propagation structure.
Claim 14
Dependent Claim
16 words
The structure of claim 8, where said bar elements are comprised of a magnetically soft material.
Claim 15
Dependent Claim
18 words
The structure of claim 8, where said bar elements are comprised of modified regions of said supporting material.
Claim 16
Dependent Claim
83 words
A structure for moving magnetic bubble domains, comprising: a magnetic medium in which said bubble domains can be moved, a gapless, one-sided structure adjacent to said magnetic medium, said structure being comprised of repetitive patterns of rectilinear bar elements along with magnetic poles are established in response to the application of a reorienting magnetic field in the plane of said medium, where said structure has a unit cell size having an area 8W2, wherein W is the minimum line width of said elements.
Claim 17
Dependent Claim
83 words
A structure for moving magnetic bubble domains, comprising: a magnetic medium in which said bubble domains can be moved, a gapless, one-sided structure adjacent to said magnetic medium, said structure being comprised of repetitive patterns of rectilinear bar elements along with magnetic poles are established in response to the application of a reorienting magnetic field in the plane of said medium, where said structure has a unit cell size having an area 8W2, wherein W is the minimum line width of said elements.
Claim 18
Dependent Claim
15 words
The structure of claim 12, where said bar elements are comprised of magnetically soft material.
Claim 19
Dependent Claim
18 words
The structure of claim 12, where said bar elements are defined by different regions of said magnetic medium.
Claim 20
Dependent Claim
25 words
The structure of claim 12, where said patterns are located with respect to one another to define a closed loop propagation path for said domains.
Claim 21
Dependent Claim
28 words
The structure of claim 12, where said structure is comprised of means for increasing the stength of said magnetic poles at selected locations along said gapless, one-sided structure.
Claim 22
Dependent Claim
16 words
The structure of claim 12, where different bar elements in each said pattern have different thicknesses.
Claim 23
Dependent Claim
13 words
The structure of claim 17, where some of said bar elements are T-bars.
Claim 24
Dependent Claim
18 words
The structure of claim 17, where the ratio of thicknesses of said different bar elements is approximately 2:1.
Claim 25
Dependent Claim
66 words
In a structure comprising a magnetic medium capable of supporting magnetic bubble domains and a propagation structure for defining the path by which said domains propagate within said magnetic medium in response to different in-plane magnetic fIelds applied to said medium, said propagation structure comprising: a plurality of contiguous elements each having a rectilinear bar segment of a thickness different from that of an adjacent element.
Claim 26
Dependent Claim
66 words
In a structure comprising a magnetic medium capable of supporting magnetic bubble domains and a propagation structure for defining the path by which said domains propagate within said magnetic medium in response to different in-plane magnetic fIelds applied to said medium, said propagation structure comprising: a plurality of contiguous elements each having a rectilinear bar segment of a thickness different from that of an adjacent element.
References Cited (Backward Citations)
US3523286A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |