GB1373298A - Magnetic device comprising domains - Google Patents
Magnetic device comprising domainsInfo
- Publication number
- GB1373298A GB1373298A GB3565072A GB3565072A GB1373298A GB 1373298 A GB1373298 A GB 1373298A GB 3565072 A GB3565072 A GB 3565072A GB 3565072 A GB3565072 A GB 3565072A GB 1373298 A GB1373298 A GB 1373298A
- Authority
- GB
- United Kingdom
- Prior art keywords
- domains
- sheet
- domain
- control
- sheets
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/02—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components
- H03K19/16—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components using saturable magnetic devices
- H03K19/168—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components using saturable magnetic devices using thin-film devices
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
- G03D9/00—Diffusion development apparatus
- G03D9/02—Diffusion development apparatus using rupturable ampoules of liquid
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C19/00—Digital stores in which the information is moved stepwise, e.g. shift registers
- G11C19/02—Digital stores in which the information is moved stepwise, e.g. shift registers using magnetic elements
- G11C19/08—Digital stores in which the information is moved stepwise, e.g. shift registers using magnetic elements using thin films in plane structure
- G11C19/0808—Digital stores in which the information is moved stepwise, e.g. shift registers using magnetic elements using thin films in plane structure using magnetic domain propagation
- G11C19/0833—Digital stores in which the information is moved stepwise, e.g. shift registers using magnetic elements using thin films in plane structure using magnetic domain propagation using magnetic domain interaction
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
- Measuring Magnetic Variables (AREA)
Abstract
1373298 Magnetic and magneto-optic storage devices; electro-acoustic transducers PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 31 July 1972 [3 Aug 1971] 35650/72 Headings H3B and H4J [Also in Division G1] Motion of single wall domains in a first magnetic sheet is controlled by the motion or position of single wall domains in a second, adjacent sheet. The field of a domain in the controlling sheet interacts with that of a domain in the first sheet to provide a preferred site for it. If the controlling sheet 52 is filled with fixed position domains 54, Fig. 5a, this provides preferred sites in sheet 51 between which the information representative domains 53 of a storage device may be moved by conventional means; if the domains in the control sheet are movable, as are domains 64, Fig. 6a, by conductor loops 66, 67, the information representative domains 63 in the adjacent sheet will also be moved by the conductor loops. One control sheet may be used with several information carrying sheets, Fig. 4b (not shown). In another embodiment, Fig. 13 (not shown), the plates are periodically moved closer and further apart; this varies the domain size, and can be used to propagate the domains in the first sheet along an angel fish overlay. The interaction between domains may be sufficient to render an external bias field unnecessary. Hollow (annular) and strip domains may be used. Logic.-The control sheet may also be used in a logic device, with the control domains serving to attract or deflect domains in the first sheet along a desired path. In Fig. 9, for example, a domain 83 propagating in the first sheet 81 under the influence of T-bar overlays will emerge at output a.b if a domain 84 (shown dotted) is present in an adjacent control sheet, but will emerge at output a.b if domain 84 is absent. Likewise in Fig. 10 (not shown) a control domain determines which path is taken where an angel fish overlay branches. Optical reading.-Because of the interaction forces between the sheets if domains are established in the control sheet then domains in the first sheet will position themselves above the control domains, in effect copying the control sheet. This can be used to enhance optical reading, since the crystal orientation of the control plate may be an optimum for displacing domains, while the crystal orientation of the first sheet is selected for the best optical reading by, e.g., the Faraday effect. Displacement and acoustic transducers.-Fig. 12 shows two adjacent sheets 111, 112 containing single wall domains 113, 114. The dimensions of these domains are determined by the magnitude of the magnetic field each imposes on the other. When the spacing between the sheets increases, the domain diameters thus increase, and the resulting flux change cause an electrical signal in conductor loop 117. Thus the signal depends on the separation change between the plates; this may be used to convert acoustic vibrations to an electric signal, or to measure the separation change. The conductor loop 117 may be replaced by a magnetostrictive permalloy foil near domain 114. By passing a current through the conductor loop the plate separation is controlled, and thus an electric signal can be converted to acoustic vibrations.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL7110674A NL7110674A (en) | 1971-08-03 | 1971-08-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1373298A true GB1373298A (en) | 1974-11-06 |
Family
ID=19813733
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3565072A Expired GB1373298A (en) | 1971-08-03 | 1972-07-31 | Magnetic device comprising domains |
Country Status (9)
Country | Link |
---|---|
US (1) | USRE32545E (en) |
JP (1) | JPS5232816B2 (en) |
BE (1) | BE787064A (en) |
CA (1) | CA958806A (en) |
DE (1) | DE2237369C3 (en) |
FR (1) | FR2148212B1 (en) |
GB (1) | GB1373298A (en) |
NL (1) | NL7110674A (en) |
SE (1) | SE388065B (en) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3760387A (en) * | 1972-06-22 | 1973-09-18 | Ibm | Magnetic bubble domain system using multiple magnetic sheets |
US4040038A (en) * | 1974-01-02 | 1977-08-02 | International Business Machines Corporation | Column accessing of elements in confined arrays |
US3996571A (en) * | 1974-03-08 | 1976-12-07 | International Business Machines Corporation | Double layer bubble domain lattice system |
US4052711A (en) * | 1974-12-31 | 1977-10-04 | International Business Machines Corporation | Bubble lattice file using movable fixed lattice |
US6403567B1 (en) | 1999-06-22 | 2002-06-11 | Cv Therapeutics, Inc. | N-pyrazole A2A adenosine receptor agonists |
US6214807B1 (en) | 1999-06-22 | 2001-04-10 | Cv Therapeutics, Inc. | C-pyrazole 2A A receptor agonists |
AU2001238665A1 (en) | 2000-02-23 | 2001-09-03 | Cv Therapeutics, Inc. | Method of identifying partial agonists of the a2a receptor |
US8470801B2 (en) | 2002-07-29 | 2013-06-25 | Gilead Sciences, Inc. | Myocardial perfusion imaging methods and compositions |
US7683037B2 (en) | 2002-07-29 | 2010-03-23 | Gilead Palo Alto, Inc. | Myocardial perfusion imaging method |
US20050020915A1 (en) | 2002-07-29 | 2005-01-27 | Cv Therapeutics, Inc. | Myocardial perfusion imaging methods and compositions |
CA2583185A1 (en) | 2004-10-20 | 2006-04-27 | Cv Therapeutics, Inc. | Use of a2a adenosine receptor agonists |
KR20080090491A (en) | 2006-02-03 | 2008-10-08 | 씨브이 쎄러퓨틱스, 인코포레이티드 | Process for preparing an a2a-adenosine receptor agonist and its polymorphs |
JP6368572B2 (en) * | 2014-07-25 | 2018-08-01 | 新日本無線株式会社 | Constant current circuit |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3523286A (en) * | 1968-08-12 | 1970-08-04 | Bell Telephone Labor Inc | Magnetic single wall domain propagation device |
US3676872A (en) * | 1971-06-21 | 1972-07-11 | Bell Canada Northern Electric | Propagation of magnetic bubble domains |
US3996571A (en) * | 1974-03-08 | 1976-12-07 | International Business Machines Corporation | Double layer bubble domain lattice system |
-
0
- BE BE787064D patent/BE787064A/en unknown
-
1971
- 1971-08-03 NL NL7110674A patent/NL7110674A/xx unknown
-
1972
- 1972-07-29 DE DE2237369A patent/DE2237369C3/en not_active Expired
- 1972-07-31 GB GB3565072A patent/GB1373298A/en not_active Expired
- 1972-08-01 SE SE7210001A patent/SE388065B/en unknown
- 1972-08-02 CA CA148,513A patent/CA958806A/en not_active Expired
- 1972-08-02 FR FR7227912A patent/FR2148212B1/fr not_active Expired
- 1972-08-03 JP JP47078000A patent/JPS5232816B2/ja not_active Expired
-
1977
- 1977-10-20 US US05/844,109 patent/USRE32545E/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
CA958806A (en) | 1974-12-03 |
SE388065B (en) | 1976-09-20 |
JPS5232816B2 (en) | 1977-08-24 |
NL7110674A (en) | 1973-02-06 |
DE2237369C3 (en) | 1980-07-03 |
USRE32545E (en) | 1987-11-17 |
FR2148212A1 (en) | 1973-03-11 |
FR2148212B1 (en) | 1976-06-11 |
JPS4826038A (en) | 1973-04-05 |
DE2237369A1 (en) | 1973-02-15 |
BE787064A (en) | 1973-02-01 |
DE2237369B2 (en) | 1979-10-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |