GB1487864A – Stabilizing magnetic bubble domains
– Google Patents
GB1487864A – Stabilizing magnetic bubble domains
– Google Patents
Stabilizing magnetic bubble domains
Info
Publication number
GB1487864A
GB1487864A
GB22914/75A
GB2291475A
GB1487864A
GB 1487864 A
GB1487864 A
GB 1487864A
GB 22914/75 A
GB22914/75 A
GB 22914/75A
GB 2291475 A
GB2291475 A
GB 2291475A
GB 1487864 A
GB1487864 A
GB 1487864A
Authority
GB
United Kingdom
Prior art keywords
bubbles
wall
layer
magnetic
garnet
Prior art date
1974-10-25
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
Application number
GB22914/75A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
Priority date (The priority date 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 date listed.)
1974-10-25
Filing date
1975-05-23
Publication date
1977-10-05
1975-05-23
Application filed by International Business Machines Corp
filed
Critical
International Business Machines Corp
1977-10-05
Publication of GB1487864A
publication
Critical
patent/GB1487864A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
H—ELECTRICITY
H01—ELECTRIC ELEMENTS
H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
H01F10/00—Thin magnetic films, e.g. of one-domain structure
H01F10/06—Thin magnetic films, e.g. of one-domain structure characterised by the coupling or physical contact with connecting or interacting conductors
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
G11C19/0858—Generating, replicating or annihilating magnetic domains (also comprising different types of magnetic domains, e.g. “Hard Bubbles”)
Abstract
1487864 Magnetic bubble devices INTERNATIONAL BUSINESS MACHINES CORP 23 May 1975 [25 Oct 1974] 22914/75 Heading H3B Wall-encoded magnetic bubbles, particularly those having either two or no Bloch lines in the domain wall as in Specification 1,487,863, are stabilized by the effect of an exchangecoupled magnetic layer subject to an in-plane magnetic field of magnitude sufficient to maintain domain coding when the domains are moved. Bubbles having two Bloch lines in the wall are designated state S = 0 and those with no lines S = 1. When S = 0 bubbles are moved at a high enough speed the wall encoding readily reverts to S = 1, with subsequent loss of data. The exchange-coupled layer increases the energy barrier EB2 of the S = 0 bubbles so preventing the reversion. The field Hx generally lies bebetween 5% and 25% of the saturation magnetization and varies with bubble size, e.g. 15- 40 Oe for 5 Á bubbles in a YEuGaFe garnet and 40-110 Oe for 1 α bubbles in an EuThGaFe garnet. The exchange coupled layer is ion-implanted, or is an FeNi or garnet layer and in practice the in-plane field is applied to both the layer and the bubble-supporting medium.
GB22914/75A
1974-10-25
1975-05-23
Stabilizing magnetic bubble domains
Expired
GB1487864A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US518026A
US3930243A
(en)
1974-10-25
1974-10-25
Method and apparatus for stabilizing a bubble domain system
Publications (1)
Publication Number
Publication Date
GB1487864A
true
GB1487864A
(en)
1977-10-05
Family
ID=24062224
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB22914/75A
Expired
GB1487864A
(en)
1974-10-25
1975-05-23
Stabilizing magnetic bubble domains
Country Status (6)
Country
Link
US
(1)
US3930243A
(en)
JP
(1)
JPS5162399A
(en)
DE
(1)
DE2543215A1
(en)
FR
(1)
FR2289025A1
(en)
GB
(1)
GB1487864A
(en)
IT
(1)
IT1042695B
(en)
Families Citing this family (5)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3996577A
(en)
*
1974-07-29
1976-12-07
International Business Machines Corporation
Method and apparatus for the controlled generation of wall-encoded magnetic bubble domains
US4068220A
(en)
*
1976-06-17
1978-01-10
International Business Machines Corporation
Controllable state conversions for S=1 bubble domains
JPS629554U
(en)
*
1985-07-02
1987-01-21
TWM243584U
(en)
*
2003-09-05
2004-09-11
Hon Hai Prec Ind Co Ltd
Captive screw
GB0809403D0
(en)
*
2008-05-23
2008-07-02
Cambridge Entpr Ltd
Family Cites Families (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3714640A
(en)
*
1971-05-28
1973-01-30
Bell Telephone Labor Inc
Single wall domain propagation arrangement
US3836898A
(en)
*
1973-10-09
1974-09-17
Bell Telephone Labor Inc
Magnetic bubble structure for suppression of dynamic bubble conversion
1974
1974-10-25
US
US518026A
patent/US3930243A/en
not_active
Expired – Lifetime
1975
1975-05-23
GB
GB22914/75A
patent/GB1487864A/en
not_active
Expired
1975-08-11
FR
FR7525828A
patent/FR2289025A1/en
active
Granted
1975-09-10
JP
JP50109055A
patent/JPS5162399A/en
active
Granted
1975-09-19
IT
IT27417/75A
patent/IT1042695B/en
active
1975-09-27
DE
DE19752543215
patent/DE2543215A1/en
not_active
Withdrawn
Also Published As
Publication number
Publication date
IT1042695B
(en)
1980-01-30
JPS5162399A
(en)
1976-05-29
FR2289025B1
(en)
1978-04-07
JPS5627953B2
(en)
1981-06-27
DE2543215A1
(en)
1976-05-06
FR2289025A1
(en)
1976-05-21
US3930243A
(en)
1975-12-30
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Legal Events
Date
Code
Title
Description
1978-02-15
PS
Patent sealed [section 19, patents act 1949]
1988-01-13
PCNP
Patent ceased through non-payment of renewal fee
