DE2137487A1 - Flexible ferrite keeper - of ferrite powder and silicone rubber , for optimum real/imaginary relative permeability values - Google Patents
Flexible ferrite keeper - of ferrite powder and silicone rubber , for optimum real/imaginary relative permeability valuesInfo
- Publication number
- DE2137487A1 DE2137487A1 DE19712137487 DE2137487A DE2137487A1 DE 2137487 A1 DE2137487 A1 DE 2137487A1 DE 19712137487 DE19712137487 DE 19712137487 DE 2137487 A DE2137487 A DE 2137487A DE 2137487 A1 DE2137487 A1 DE 2137487A1
- Authority
- DE
- Germany
- Prior art keywords
- ferrite
- keeper
- flexible
- ferrite powder
- relative permeability
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
- H01F1/36—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites in the form of particles
- H01F1/37—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites in the form of particles in a bonding agent
- H01F1/375—Flexible bodies
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Description
"Flexibler Ferritkeeper" In ferromagnetischen Dünnschichtspeichern mit planaren oder zylindrischen Speicherschichten wird zur Verbesserung der Speicherfunktion ein sogenannter Keeper verwendet. Er besteht aus einer isotropen weichmegnetischen Schicht oder Folie und ist über den Speicherflecken und Bit und Wortleitern angeordnet. Sein Zweck besteht primär in der Aus bildung eines magnetischen Rückschlusses, wodurch die wechselseitigen Einflüsse der magnetischen Streufelder benachbarter Speicherflecken sowie der Steuer- und Beseleitungen reduziert werden können. Als besonders günstig erwies sich ein isolierender, flexibler Ferrit-Keeper, da sich dieser im Gegensatz zu starren Ferritplatten oder zu losem Ferritpulver besser in den Speicheraufbau einfügen läßt und Luftspalte vermieden werden können. "Flexible ferrite keeper" In ferromagnetic thin-film storage using planar or cylindrical storage layers will improve the storage function a so-called keeper is used. It consists of an isotropic soft magnetic Layer or foil and is arranged over the memory pads and bit and word lines. Its purpose consists primarily in the formation of a magnetic return path, whereby the mutual influences of the magnetic stray fields of neighboring storage spots as well as the control and escort lines can be reduced. As particularly cheap proved to be an insulating, flexible ferrite keeper as this was in contrast Rigid ferrite plates or loose ferrite powder are better integrated into the storage structure can be inserted and air gaps can be avoided.
Für die Brauchbarkeit eines flexiblen Ferritkeepers müssen jedoch mehrere Voraussetzungen erfüllt sein. In erster Linie soll der Realteil der relativen Permeabilität des Keepers (#r') so hoch wie möglich und der Imaginärteil möglichst niedrig sein, Außerdem muß das Isolationsvermögen, die Elastizität, Porenfreiheit, Oberflächengüte und Homogenität der Zusammensetzung berucksichtigt werde Diese Forderungen sind eng verknüpft mit den Eigenschaften des Ferritmaterials und des Binders, mit dem anteilmäßigen Verhältnis von Ferrit zu Binder, mit den Verarbeitungsbedingungen, mit der Korngrößenverteilung des Ferritpulvers und der Oberflächenstruktur des einzelnen Ferritkornes.However, for a flexible ferrite keeper to be useful several requirements must be met. First and foremost, the real part should be the relative Permeability of the keeper (#r ') as high as possible and the imaginary part as possible be low, In addition, the insulation capacity, elasticity, freedom from pores, Surface quality and homogeneity of the composition will take these requirements into account are closely related to the properties of the ferrite material and the binder, with the proportional ratio of ferrite to binder, with the processing conditions, with the grain size distribution of the ferrite powder and the surface structure of the individual Ferrite grain.
Vor allem auf die Oberfläche des Ferritkornes und auf ein ausgewogenes Verhältnis von Grob- und Feinkornanteil kommt es an, wenn ein Keeper mit befriedigenden Eigenschaften resultieren soll. Es lassen sich beispielsweise Keeper herstellen, bei denen die Kornverteilung des Ferrits und die Zusammensetzung der Mischung fast gleich ist, die aber aufgrund der differierenden spezifischen Oberflächen des Ferritpulvers unterschiedliche Eigenschaften besitzen, Der Erfindung liegt die Aufgabe zugrunde, eine Perritkomposition für die Herstellung von flexiblen Keepern anzugeben, die den oben genannten Anforderungen genügt. Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, daß zur Herstellung des Keepers Berritpulver mit einer spezifischen Oberfläche < 1 m²/g und/oder einer bestimten Kornverteilung verwendet werden0 Bei einem praktischen Ausführungsbeispiel, anhand dessen die Erfindung erläutert wird, wurde eine Mischung aus 100 Gew, Teilen Ferritpulver, 10 Gew. Teilen Äthylmethylketon, 4 GewO Teilen Dimethylpolysiloxan, 6 Gew. Teile Silikonkautschuk und 0,8 Gew. Teile Harter hergestellt und die Mischung auf-eine Kunststoff-Folie ausgegossen und zu einer dünnen Schicht ausgeformt. Das Ferritpulver besaß eine spezifische Oberfläche von 0,50 m2/g, die Siebanalyse ergab folgende Kornverteilung: Korn > 100 #m 1 % Korn zwischen 100 und 63 pm 30 % Korn zwischen 63 und 45 #m 19 % Korn zwischen 45 und 36 #m 12 % Korn < 36 #m 38 % Als Ferrit kann beispielsweise ein Mn-Zn-Ferrit oder ein Ni-Zn-Ferrit verwendet werden. Die Meßkörper besaßen-einen Füllgrad von 90 Gew. % Ferrit und zeigten einen #r'-Wert von 15 und einen #r'-Wert von 2 bei einer Frequenz von 100 MHz.Especially on the surface of the ferrite grain and on a balanced one Ratio of coarse and fine grain content matters when a keeper with a satisfactory Properties should result. For example, keepers can be produced where the particle size distribution of the ferrite and the composition of the mixture are almost is the same, but due to the different specific surface areas of the ferrite powder have different properties, the invention is based on the object specify a Perrit composition for the production of flexible keepers, the meets the above requirements. This object is achieved according to the invention solved in that for the production of the keeper Berrit powder with a specific Surface <1 m² / g and / or a certain grain size distribution can be used0 In a practical embodiment, on the basis of which the invention is explained is, a mixture of 100 parts by weight of ferrite powder, 10 parts by weight of ethyl methyl ketone, 4 parts by weight of dimethylpolysiloxane, 6 parts by weight of silicone rubber and 0.8 part by weight Made harder and poured the mixture onto a plastic sheet and closed it formed in a thin layer. The ferrite powder had a specific surface area of 0.50 m2 / g, the sieve analysis showed the following grain distribution: grain> 100 #m 1 % Grain between 100 and 63 pm 30% grain between 63 and 45 #m 19% grain between 45 and 36 #m 12% grain <36 #m 38% A Mn-Zn ferrite, for example, can be used as the ferrite or a Ni-Zn ferrite can be used. The measuring bodies had a degree of filling of 90% by weight ferrite and showed a # r 'value of 15 and a # r 'value of 2 at a frequency of 100 MHz.
Die Zeichnung zeigt einen gemäß dem Ausführungsbeispiel hergestellten Ferritkeeper in perspektivischer Darstellung (die Dicke ist stark vergrößert dargestellt).The drawing shows one produced in accordance with the exemplary embodiment Ferrite keeper in perspective (the thickness is shown greatly enlarged).
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19712137487 DE2137487A1 (en) | 1971-07-27 | 1971-07-27 | Flexible ferrite keeper - of ferrite powder and silicone rubber , for optimum real/imaginary relative permeability values |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19712137487 DE2137487A1 (en) | 1971-07-27 | 1971-07-27 | Flexible ferrite keeper - of ferrite powder and silicone rubber , for optimum real/imaginary relative permeability values |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2137487A1 true DE2137487A1 (en) | 1973-02-01 |
Family
ID=5814935
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19712137487 Pending DE2137487A1 (en) | 1971-07-27 | 1971-07-27 | Flexible ferrite keeper - of ferrite powder and silicone rubber , for optimum real/imaginary relative permeability values |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2137487A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2463490A1 (en) * | 1979-08-14 | 1981-02-20 | Dumas Jean Claude | Magnetic material comprising solidified polymer matrix - incorporating ferromagnetic particles, for electromagnets and artificial organ |
WO2001029851A1 (en) * | 1999-10-18 | 2001-04-26 | Tokin Corporation | Composite magnetic body and electromagnetic interference suppressing body using the same |
WO2001029850A1 (en) * | 1999-10-18 | 2001-04-26 | Tokin Corporation | Composite magnetic body, and electromagnetic interference suppressing body using the same |
-
1971
- 1971-07-27 DE DE19712137487 patent/DE2137487A1/en active Pending
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2463490A1 (en) * | 1979-08-14 | 1981-02-20 | Dumas Jean Claude | Magnetic material comprising solidified polymer matrix - incorporating ferromagnetic particles, for electromagnets and artificial organ |
WO2001029851A1 (en) * | 1999-10-18 | 2001-04-26 | Tokin Corporation | Composite magnetic body and electromagnetic interference suppressing body using the same |
WO2001029850A1 (en) * | 1999-10-18 | 2001-04-26 | Tokin Corporation | Composite magnetic body, and electromagnetic interference suppressing body using the same |
US6599375B1 (en) | 1999-10-18 | 2003-07-29 | Nec Tokin Corporation | Composite magnetic body, and electromagnetic interference suppressing body using the same |
US6712989B1 (en) | 1999-10-18 | 2004-03-30 | Tokin Corporation | Composite magnetic body and electromagnetic interference suppressing body using the same |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OHJ | Non-payment of the annual fee |