IE36253B1 - Improvements in or relating to magnetic devices - Google Patents
Improvements in or relating to magnetic devicesInfo
- Publication number
- IE36253B1 IE36253B1 IE809/71A IE80971A IE36253B1 IE 36253 B1 IE36253 B1 IE 36253B1 IE 809/71 A IE809/71 A IE 809/71A IE 80971 A IE80971 A IE 80971A IE 36253 B1 IE36253 B1 IE 36253B1
- Authority
- IE
- Ireland
- Prior art keywords
- domains
- loop
- domain
- permalloy
- reading device
- Prior art date
Links
Classifications
-
- 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
- G11C19/0841—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 electric current
Landscapes
- Thin Magnetic Films (AREA)
- Hall/Mr Elements (AREA)
- Mram Or Spin Memory Techniques (AREA)
Abstract
1354770 Moving domain devices WESTERN ELECTRIC CO Inc 18 June 1971 [24 June 1970] 28778/71 Heading H3B In a moving magnetic domain device, Fig. 1, domains representing '0' and '1' bits are propagated in two distinct channels separated by a magnetically soft material or by a groove in the sheet containing the domains. The sheet 11 has two circulating paths defined by a loop of permalloy 12, and two serpentine conductors 14, 15 are provided on respective faces of the sheet to move domains such as D along the paths. The domains shown at D are assigned the bit '0', while those lying on the outer edge of the loop signify '1'; only the latter are detected by a reading device for supply to a utilization circuit 24, the absence of a '1' signifying a '0' in the usual manner. The domains are maintained stable in size by a bias field set up by source 25. Domains are not created and destroyed, but a '0' domain may be converted into a '1' by pulsing a loop conductor such as that shown at 20 in Fig. 2, to displace it across the permalloy loop 12; by reversing the current a '1' may be drawn across the loop to become a '0'. Such pulses are derived from source 21, Fig. 1, under control of synchronizing circuitry 26. The dimensions of the permalloy strip govern the ease with which domains are displaced across it, and the width is chosen to be about 0À7 times the domain diameter in regions where displacement across it may be desired. Elsewhere the width is 0À5 times the diameter except around the reading device where a factor of 0À2 is used to separate the '0' and '1' domains widely. The reading device may be a simple conductor loop or Hall probe, or optical reading by Faraday or Kerr effect may be used.
[GB1354770A]
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US4927370A | 1970-06-24 | 1970-06-24 |
Publications (2)
Publication Number | Publication Date |
---|---|
IE36253L IE36253L (en) | 1971-12-24 |
IE36253B1 true IE36253B1 (en) | 1976-09-29 |
Family
ID=21958972
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IE809/71A IE36253B1 (en) | 1970-06-24 | 1971-06-23 | Improvements in or relating to magnetic devices |
Country Status (9)
Country | Link |
---|---|
US (1) | US3636531A (en) |
BE (1) | BE768895A (en) |
CH (1) | CH544374A (en) |
DE (1) | DE2130442A1 (en) |
ES (1) | ES393083A1 (en) |
FR (1) | FR2099838A5 (en) |
GB (1) | GB1354770A (en) |
IE (1) | IE36253B1 (en) |
NL (1) | NL7108429A (en) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3735145A (en) * | 1970-10-16 | 1973-05-22 | North American Rockwell | Magnetic bubble domain system |
US3827036A (en) * | 1971-03-12 | 1974-07-30 | Rockwell International Corp | Magnetic bubble domain system |
US3790935A (en) * | 1971-03-26 | 1974-02-05 | Bell Canada Northern Electric | Bubble in low coercivity channel |
IT947683B (en) * | 1971-04-12 | 1973-05-30 | Ibm | PROPAGATION SYSTEM USING CYLINDRICAL MAGNETIC DOMAIN CONDUCTORS |
US3893089A (en) * | 1971-04-12 | 1975-07-01 | Ibm | Two-phase propagation of cylindrical magnetic domains |
US3831156A (en) * | 1971-12-06 | 1974-08-20 | Hughes Aircraft Co | Biasing apparatus for magnetic domain stores |
US3711840A (en) * | 1971-12-13 | 1973-01-16 | Bell Telephone Labor Inc | Write circuit using enhanced propagation pulses for lateral displacement coding of patterns of single-wall magnetic domains |
US3711842A (en) * | 1971-12-30 | 1973-01-16 | Bell Telephone Labor Inc | Single wall magnetic domain logic arrangement |
US3806899A (en) * | 1972-04-10 | 1974-04-23 | Hughes Aircraft Co | Magnetoresistive readout for domain addressing interrogator |
US3876994A (en) * | 1972-06-22 | 1975-04-08 | Ibm | Planar bias field control of magnetic bubble domain apparatus |
US3774182A (en) * | 1972-08-15 | 1973-11-20 | Bell Telephone Labor Inc | Conductor-pattern apparatus for controllably inverting the sequence of a serial pattern of single-wall magnetic domains |
US4207614A (en) * | 1972-09-02 | 1980-06-10 | U.S. Philips Corporation | Magnetic bubble shift register store |
US3811120A (en) * | 1973-04-05 | 1974-05-14 | Bell Telephone Labor Inc | Magnetic domain propagation arrangement having channels defined by straight line boundaries |
US3927398A (en) * | 1974-10-21 | 1975-12-16 | Canadian Patents Dev | Magnetic bubble propagation circuit |
NL7709312A (en) * | 1977-08-24 | 1979-02-27 | Philips Nv | DESIGN WITH MAGNETIC BELL DOMAINS |
US7724558B1 (en) * | 1999-03-19 | 2010-05-25 | Nec Corporation | Magnetic signal transmission line |
-
1970
- 1970-06-24 US US49273A patent/US3636531A/en not_active Expired - Lifetime
-
1971
- 1971-06-18 NL NL7108429A patent/NL7108429A/xx unknown
- 1971-06-18 CH CH895371A patent/CH544374A/en not_active IP Right Cessation
- 1971-06-18 GB GB2877871A patent/GB1354770A/en not_active Expired
- 1971-06-19 DE DE19712130442 patent/DE2130442A1/en active Pending
- 1971-06-23 ES ES393083A patent/ES393083A1/en not_active Expired
- 1971-06-23 BE BE768895A patent/BE768895A/en unknown
- 1971-06-23 IE IE809/71A patent/IE36253B1/en unknown
- 1971-06-23 FR FR7122826A patent/FR2099838A5/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
ES393083A1 (en) | 1974-07-01 |
GB1354770A (en) | 1974-06-05 |
NL7108429A (en) | 1971-12-28 |
IE36253L (en) | 1971-12-24 |
DE2130442A1 (en) | 1971-12-30 |
BE768895A (en) | 1971-11-03 |
US3636531A (en) | 1972-01-18 |
CH544374A (en) | 1973-11-15 |
FR2099838A5 (en) | 1972-03-17 |
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